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Magnetic Effects of Electric Current  

 

10th Science (Physics)

Magnetic Effects of Electric Current 

(Most Important Questions) 

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1 / 36

Which of the following diagrams correctly shows the magnetic field produced by a current- carrying wire?

 

D

C

A

B

2 / 36

A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in the figure below:

                                   

The force on the wire due to the magnet is directed

From N to S

From S to N

Vertically downwards

Vertically upwards

3 / 36

The frequency of electricity produced by DC generator is equal to

0 Hz

50 Hz

200 Hz

100 Hz

4 / 36

An electric motor is a device which transforms

Mechanical energy into electrical energy

Electrical energy into mechanical energy

Kinetic energy into potential energy

Electrical energy into Potential energy

5 / 36

The shape of the magnetic field lines produced by a current carrying conductor are

Straight lines

Concentric circles

Concentric ellipse

Concentric parabolas

6 / 36

A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is:

A: Held stationary

B: Moved away along its axis

C: Moved towards along its axis

There will be a induced current in

A only

A and B only

B and C only

A, B and C

7 / 36

If two circular coils can be arranged in any of the three situations as shown in the diagrams below, then their mutual induction will be:

 

Maximum in situation a

Maximum in situation b

Maximum in situation c

The same in all situations

8 / 36

A fuse should always be placed in the

Live wire of the main circuit

Neutral wire of the main circuit

Earth wire of the main circuit

Both live and neutral wire of the main circuit.

9 / 36

A positive charge is moving towards a person. The direction of magnetic field lines will be in

Clockwise direction

Anticlockwise direction

Vertically upward direction

Vertically downward direction

10 / 36

An induced emf is produced when a magnet is moved into a coil. The magnitude of induced emf does not depend on

The speed with which the magnet is moved

The number of turns of the coil

The resistivity of the wire of the coil

The strength of the magnet

11 / 36

The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between wire and the direction of magnetic field is

45^o

60^o

90^o

180^o

12 / 36

A current carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor

From top to bottom

From left to right

From bottom to top

From right to left

13 / 36

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid

Will decrease

Will increase

Will become zero

Will remain the same

14 / 36

The north pole of Earth’s magnet is in the

Geographical South

Geographical East

Geographical West

Geographical North

15 / 36

The magnetic field lines outside a bar magnet

Originate from the South pole and end at its North Pole

Originate from the North pole and end at its East Pole

Originate from the North Pole and end at its South Pole

Originate from the South pole and end at its West Pole

16 / 36

A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in figure. The direction of magnetic field at a point will be north to south.

 

Directly above the wire

Directly below the wire

At a point located in the plane of the paper on the north side of the wire

At a point located in the plane of the paper on the south side of the wire

17 / 36

Choose the incorrect statement.

Fleming's right hand rule is a simple rule to know the direction of induced current.

The right hand thumb rule is used to find the direction of magnetic fields due to current carrying conductors.

The difference between the direct and alternating currents is that the direct current always flows in one direction, where as the alternating current reverses its direction periodically

In India, the AC changes direction after every1/50 second.

18 / 36

In the arrangement shown in figure, there are two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then

 

The deflection in the galvanometer remains zero throughout

There is a momentary deflection in the galvanometer but it dies out shortly and there is no effect when the key is removed.

There are momentary galvanometers deflections that die out shortly, the deflections are in the same direction.

There are momentary galvanometers deflections that die out shortly, the deflections are in opposite directions. Thus the galvanometer shows momentary deflections in opposite directions.

19 / 36

Commercial electric motors do not use

An electromagnet to rotate the armature

Effectively large number of turns of conducting wire in the current carrying coil

A permanent magnet to rotate the armature

A soft iron core on which the coil is wound

20 / 36

A uniform magnetic field exists in the plane of paper pointing from left to right as shown in figure. In the field an electron and a proton move as shown. The electron and the proton experience.

Forces both pointing into the plane of paper

Forces both pointing out of the plane of paper

Forces pointing into the plane of paper and out of the plane of paper, respectively

Force pointing opposite and along the direction of the uniform magnetic field respectively

21 / 36

For a current in a long straight solenoid N and S-poles are created at the two ends. Among the following statements, the incorrect statement is

The field lines inside the solenoid are in the form of straight lines, which indicates that the magnetic field is the same at all points inside the solenoid

The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil

The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet

The N and S-poles exchange position when the direction of current through the solenoid is reversed

22 / 36

A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anti-clockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to

 

A

B

A if the current is small and B if the current is large

B if the current is small and A if the current is large

23 / 36

If the key in the arrangement as shown below is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are

 

Concentric circles

Elliptical in shape

Straight lines parallel to each other

Concentric circles near the point O but of elliptical shapes as we go away from it

24 / 36

Choose the incorrect statement from the following regarding magnetic lines of field

The direction of magnetic field at a point is taken to be the direction in which the North Pole of a magnetic compass needle points

Magnetic field lines are closed curves

If magnetic field lines are parallel and equidistant, they represent zero field strength

Relative strength of magnetic field is shown by the degree of closeness of the field lines

25 / 36

In electric motor, to make the coil rotating continuously in the same direction, current is reversed in the coil after every half rotation by a device called

carbon brush

commutator

slip ring

armature

26 / 36

Direction of rotation of a coil in electric motor is determined by

Fleming’s right hand rule

Fleming’s left hand rule

Faraday law of electromagnetic inductors

None of above

27 / 36

When current is parallel to magnetic field, then force experience by the current carrying conductor placed in uniform magnetic field is

Twice to that when angle is 60°

Thrice to that when angle is 60°

zero

infinite

28 / 36

The factors on which one magnetic field strength produced by current carrying solenoids depends are

Magnitude of current

Number of turns

Nature of core material

All of the above

29 / 36

The nature of magnetic field line passing through the centre of current carrying circular loop is

circular

ellipse

parabolic

straight line

30 / 36

The pattern of the magnetic field produced by the straight current carrying conducting wire is

in the direction opposite to the current

in the direction parallel to the wire

circular around the wire

in the same direction of current

31 / 36

Which of the following statement is not correct about the magnetic field?

Magnetic field lines form a continuous closed curve.

Magnetic field line do not interest each other.

Direction of tangent at any point on the magnetic field line curve gives the direction of magnetic field at that point.

Outside the magnet, magnetic field lines go from South to North pole of the magnet.

32 / 36

Relative strength of magnetic field at a point in the space surrounding the magnet is shown by the

length of magnet

thickness of magnet

degree of closeness of the field.

resistance offered by the surroundings

33 / 36

Magnetic effect of current was discovered by

Oersted

Faraday

Bohr

Ampere

34 / 36

The most important safety method used for protecting home appliances from short circuiting or overloading is

Earthing

Use of fuse

Use of stabilizers

Use of electric meter

35 / 36

To convert an AC generator into DC generator

Split ring type commutator must be used

Slip rings and brushes must be used

A stronger magnetic field has to be used

A rectangular wire loop has to be used

36 / 36

The strength of magnetic field inside a long current carrying straight solenoid is

More at the ends than at the centre

Minimum in the middle

Same at all points

Found to increase from one end to the other

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Control & Co – ordination 

10th Science (Biology)

Control & Co - ordination

(Most Important Questions) 

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1 / 37

The movement of a plant part in response to the force of attraction exerted by the earth is called

Hydrotropism

Geotropism

Chemotropism

Phototropism

2 / 37

Electrical impulse travels in a neuron from

Dendrite → axon → axon end → cell body

Cell body → dendrite → axon → axon end

Dendrite → cell body → axon → axon end

Axon end →axon → cell body → dendrite

3 / 37

The dramatic changes in body features associated with puberty are mainly because of the secretions of

Estrogen from testes and testosterone from ovary

Estrogen from adrenal gland and testosterone from pituitary gland

Testosterone from testes and estrogen from ovary

Testosterone from thyroid gland and estrogen from pituitary gland

4 / 37

A doctor advised a person to take injection of insulin because his

Blood pressure was high

Heart beat was high

Blood sugar was high

Thyroxine level in blood was high

5 / 37

Which of the following control and regulate the life process?

Reproductive and endocrine systems

Reproductive and endocrine systems

Endocrine and digestive systems

Nervous and endocrine systems

6 / 37

Which of the following controls the involuntary actions in the body?

Medulla in forebrain

Medulla in hindbrain

Medulla in spinal cord

Medulla in midbrain

7 / 37

Iodine is necessary for the synthesis of which of the following hormone?

Adrenaline

Auxin

Thyroxine

Insulin

8 / 37

The number of pairs of nerves which arises from the spinal cord are

21

31

11

22

9 / 37

Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called

Phototropism

Thigmonasty

Chemotropism

Photonasty

10 / 37

A growing seedling is kept in a dark room. A burning lamp is placed near to it for a few days. The top part of seedling bends towards the burning candle. This is an example of

Chemotropism

Hydrotropism

Phototropism

Geotropism

11 / 37

The stimulus in the process of thigmotropism is

Touch

Gravity

Chemical

Light

12 / 37

The plant hormone which triggers the fall of mature leaves and fruits from the plant body is

Auxin

Gibberellin

Abscisic acid

Cytokinin

13 / 37

The growth of tendrils in pea plants is due to the

Effect of sunlight on the tendril cells facing the sun

Effect of gravity on the part of tendril hanging down towards the earth

Rapid cell division and elongation in tendril cells that are away from the support

Rapid cell division and elongation in tendril cells in contact with the support

14 / 37

The main function of the plant hormone called abscisic acid is to

Increase the length of cells

Promote cell division

Inhibit growth

Promote growth of stem and roots

15 / 37

A big tree falls in a forest, but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertically). This happens in response to

Water and light

Water and minerals

Gravity and water

Light and gravity

16 / 37

The shape of guard cells changes due to change in the

Protein composition of cells

Temperature of cells

Amount of water in cells

Position of nucleus in the cells

17 / 37

Select the mis-matched pair

Adrenaline—Pituitary gland

Testosterone—Testes

Estrogen—Ovary

Thyroxin—Thyroid gland

18 / 37

Choose the incorrect statement about insulin

It is produced from pancreas.

It regulates growth and development of the body.

It regulates blood sugar level.

Insufficient secretion of insulin will cause diabetes.

19 / 37

Which of the following is not associated with growth of plant?

Auxin

Gibberellins

Cytokinins

Abscisic acid

20 / 37

The main function of abscisic acid in plants is to

Increase the length of cells

Promote cell division

Inhibit growth

Promote growth of stem

21 / 37

The movement of shoot towards light is

Geotropism

Hydrotropism

Chemotropism

Phototropism

22 / 37

Spinal cord originates from

Cerebrum

Medulla

Pons

Cerebellum

23 / 37

Posture and balance of the body is controlled by

Cerebrum

Cerebellum

Medulla

Pons

24 / 37

Which of the following statements are true about the brain?

(i) The main thinking part of brain is hind brain.

(ii) Centres of hearing, smell, memory, sight, etc., are located in fore brain.

(iii) Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hind brain.

(iv) Cerebellum does not control posture and balance of the body.

(i) and (ii)

(i) (ii) and (iii)

(ii) and (iii)

(iii) and (iv)

25 / 37

Which of the following statements are true?

(i) Sudden action in response to something in the environment is caller reflex action

(ii) Sensory neurons carry signals from spinal cord to muscles.

(iii) Motor neurons carry signals from receptors to spinal cord.

(iv) The path through which signals are transmitted from a receptor to muscle or a gland is called reflex arc.

(i) and (ii)

(i) and (iii)

(i) and (iv)

(i) (ii) and (iii)

26 / 37

Which is the correct sequence of the components of a reflex arc?

Receptors → Muscles → Sensory neuron → Motor neuron → Spinal cord

Receptors → Motor neuron → Spinal cord → Sensory neuron → Muscle

Receptors → Spinal cord → Sensory neuron → Motor neuron → Muscle

Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle

27 / 37

In a neuron, conversion of electrical signal to a chemical signal occurs at/in

Cell Body

Axonal end

Dendritic end

Axon

28 / 37

In a synapse, chemical signal is transmitted from

Dendritic end of one neuron to axonal end of another neuron

Axon to cell body of the same neuron

Cell body to axonal end of the same neuron

Axonal end of one neuron to dendritic end of another neuron

29 / 37

Which of the following statements is correct about receptors?

Gustatory receptors detect taste while olfactory receptors detect smell

Both gustatory and olfactory receptors detect smell

Auditory receptors detect smell and olfactory receptors detect taste

Olfactory receptors detect taste and gustatory receptors smell

30 / 37

In humans, the life processes are controlled and regulated by

Reproductive and endocrine systems

Respiratory and nervous systems

Endocrine and digestive systems

Nervous and endocrine systems

31 / 37

Junction between two neurons is called

Cell junction

Neuro muscular junction

Neural joint

Synapse

32 / 37

Which of the following endocrine glands is unpaired?

Adrenal

Testes

Pituitary

Ovary

33 / 37

The hormone which increase the fertility in males is called

Oestrogen

Testosterone

Insulin

Growth hormone

34 / 37

Dramatic changes of body features associated with puberty are mainly because of secretion of

Oestrogen from testes and testosterone from ovary

Estrogen from adrenal gland and testosterone from pituitary gland

Testosterone from testes and estrogen from ovary

Testosterone from thyroid gland and estrogen from pituitary gland

35 / 37

Dwarfism results due to

Excess secretion of thyroxin

Less secretion of growth hormone

Less secretion of adrenaline

Excess secretion of growth hormone

36 / 37

Which statement is not true about thyroxin?

Iron is essential for the synthesis of thyroxin

It regulates carbohydrates, protein and fat metabolism in the body

Thyroid gland requires iodine to synthesise thyroxin

Thyroxin is also called thyroid hormone

37 / 37

When a person is suffering from severe cold, he or she cannot

Differentiate the taste of an apple from that of an ice cream

Differentiate the smell of a perfume from that of an agarbatti

Differentiate red light from green light

Differentiate a hot object from a cold object.

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Light – Reflection & Refraction

10th Science (Physics)

Light - Reflection & Refraction

(Most Important Questions) 

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1 / 40

A student traces the path of a ray of light passing through a rectangular slab for three different values of angle of incidence (∠i ) namely 30^o, 45^o and 60^o. He extends the direction of incident ray by a dotted line and measures the perpendicular distance ‘l’ between the extended incident ray and the emergent ray.He will observe that

‘l’ keeps on increasing with increase in angle of incidence

‘l’ keeps on decreasing with increase in angle of incidence

‘l’ remains the same for all three angles of incidence

‘l’ is the maximum for ∠i = 45o and is less than this value for ∠i = 30o and ∠i = 60o.

2 / 40

Four students A, B, C and D performed the experiment to determine the focal length of a concave mirror by obtaining the image of a distant tree on a screen. They measured the distances between the screen and the mirror as shown in the diagrams given, The correct way to measure accurate focal length of the mirror is

B

A

D

C

3 / 40

A student traces the path of a ray of light passing through a rectangular slab, For measuring the angle of incidence, he must position the protractor in the manner shown in the figure

D

B

C

A

4 / 40

While performing an experiment on determination of focal length of a convex lens, four students obtained the image of the same distant tree on the screen as given figure, Which diagram shows the formation of image correctly?

A

C

B

D

5 / 40

 A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure

A

B

C

D

6 / 40

If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed at a distance of 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is

20 cm

10 cm

22 cm

18 cm

7 / 40

 Which of the following can make a parallel beam of light when light from a point source is incident on it?

Concave mirror as well as convex lens

Convex mirror as well as concave lens

Two plane mirrors placed at 900 to each other

Concave mirror as well as concave lens

8 / 40

A lens of focal length 12 cm forms an erect image, three times the size of the object. The distance between the object and image is

8 cm

4 cm

16 cm

24 cm

9 / 40

A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of

120^o

180^o

90^o

0^o

10 / 40

A ray of light is travelling in a direction perpendicular to the boundary of a parallel glass slab. The ray of light:

Is refracted towards the normal

Is refracted away from the normal

Is reflected along the same path

Does not get refracted

11 / 40

Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same

Mirror A is concave and mirror B is convex

Mirror A is plane and mirror B is concave

Mirror A is concave and mirror B is plane

Mirror A is convex and mirror B is concave

12 / 40

 A concave mirror produces a magnification of +4. The object is placed

At the focus

Between focus and centre of curvature

Between focus and pole

Beyond the centre of curvature

13 / 40

Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used?

10 cm

20 cm

25 cm

40 cm

14 / 40

An object is placed at 100 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature of the mirror is

Less than 100 mm

Between 100 mm and 200 mm

Exactly 200 mm

More than 200 mm

15 / 40

A ray of light that strikes a plane mirror PQ at an angle of incidence of 30^o, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is

30^o

40^o

60^o

50^o

16 / 40

An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is

2 cm

12 cm

4 cm

8.5 cm

17 / 40

Rays from sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

15 cm in front of the mirror

30 cm in front of the mirror

Between 15 cm and 30 cm in front of the mirror

More than 30 cm in front of the mirror

18 / 40

Magnification produced by a rear view mirror fitted in vehicles

is less than one

is more than one

is equal to one

can be more than or less than one depending upon the position of the object in front of it.

19 / 40

Which of the following statements is true?

A convex lens has 4 dioptre power having a focal length 0.25 m

A convex lens has 4 dioptre power having a focal length – 0.25 m

A concave lens has 4 dioptre power having a focal length 0.25 m

A concave lens has 4 dioptre power having a focal length – 0.25 m

20 / 40

A beam of Light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in the figure. Which of the following could be inside the box?

Concave lens

Rectangular glass slab

Prism

Convex lens

21 / 40

Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the figure. Which of the following could be inside the box?

A rectangular glass slab

A convex lens

A concave less

A prism

22 / 40

 A light ray enters from medium A to medium B as shown in the figure. The refractive index of medium B relative to A will be

Greater than unity

Less than unity

Equal to unity

Zero

23 / 40

Under which of the following conditions, a concave mirror can form an image larger than the actual object?

When the object is kept at a distance equal to its radius of curvature

When object is kept at a distance less than its focal length

When object is placed between the focus and centre of curvature

When object is kept at a distance greater than its radius of curvature

24 / 40

A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is

‒ 30 cm

‒ 20 cm

‒ 40 cm

‒ 60 cm

25 / 40

The nature of the image formed by concave mirror when the object is placed between the focus (F) and centre of curvature (C) of the mirror observed by us is

real, inverted and diminished

virtual, erect and smaller in size

real, inverted and enlarged

virtual, upright and enlarged

26 / 40

An object at a distance of + 15 cm is slowly moved towards the pole of a convex mirror. The image will get

shortened and real

enlarged and real

enlarge and virtual

diminished and virtual

27 / 40

Which of the following mirror is used by a dentist to examine a small cavity?

Convex mirror

Plane mirror

Concave mirror

Combination of convex and concave mirror

28 / 40

An object is placed at a distance of 0.25 m in front of a plane mirror. The distance between the object and image will be

0.25 m

0.5 m

0.15 m

0.35 m

29 / 40

In which of the following, the image of an object placed at infinity will be highly diminished and point sized?

Concave mirror only

Convex mirror only

Convex lens only

Convex mirror, convex mirror, concave lens and convex lens

30 / 40

A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top

Plane, convex and concave

Convex, concave and plane

Concave, plane and convex

Convex, plane and concave

31 / 40

Which of the following ray diagrams is correct for the ray of light incident on a lens shown in figure?

Fig. A

Fig. B

Fig. C

Fig. D

32 / 40

Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in figure?

Fig. A

Fig. B

Fig. D

Fig. C

33 / 40

You are given water, mustard oil, glycerine and kerosene. In which of these media, a ray of light incident obliquely at some angle would bend the most

Kerosene

Water

Mustard oil

Glycerine

34 / 40

 The path of a ray of light coming from air passing through a rectangular glass slab traced by four students shown as A, B, C and D in the figure. Which one of them is correct?

B

C

D

A

35 / 40

 The laws of reflection hold good for

plane mirror only

concave mirror only

convex mirror only

all mirrors irrespective of their shape

36 / 40

In torches, search lights and headlights of vehicles, the bulb is placed

between the pole and the focus of the reflector

very near to the focus of the reflector

between the focus and centre of curvature of the reflector

at the centre of curvature of the reflector

37 / 40

A full length image of a distant tall building can definitely be seen by using

a concave mirror

a convex mirror

a plane mirror

both concave as well as plane mirror

38 / 40

A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at

at infinity

at focus

at the pole

behind the mirror

39 / 40

You are given three media A, B and C of refractive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is

A

B

C

equal in all three media

40 / 40

If a man’s face is 25 cm in front of concave shaving mirror producing erect image 1.5 times the size of face, focal length of the mirror would be

75 cm

55 cm

65 cm

25 cm

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Metals & Non Metals

 

10th Science (Chemistry)

Metals & Non Metals

(Most Important Questions) 

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1 / 46

Which of the following property is generally not shown by metals?

Electrical conduction

Sonorous in nature

Dullness

Ductility

2 / 46

An element X is soft and can be cut with the help of a knife. It is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following

Mg

Na

Fe

C

3 / 46

Which of the following alloys contains a non-metal as one of its constituents?

Steel

Brass

Amalgam

Bronze

4 / 46

Galvanisation is a method of protecting steel and iron from rusting by coating them with a thin layer of

Copper

Aluminum

Zinc

Bauxite

5 / 46

Which of the following pairs of reactants will go undergo a displacement reaction?

CuSO_{4 + Fe}

ZnSO_{4 + Fe}

MgSO_{4 + Fe}

Ca(SO_{4)2 + Fe}

6 / 46

Which among the following is the most abundant metal found in the earth’s crust?

Magnesium

Aluminium

Oxygen

Iron

7 / 46

Which of the following pairs will give displacement reactions?

NaCl solution and copper metal

MgCl_{2 solution and aluminium metal}

FeSO_{4 solution and silver metal}

AgNO_{3 solution and copper metal}

8 / 46

An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be

Ca

C

Si

Hg

9 / 46

Which of the following represent the correct order of decreasing reactivity?

Mg > Al > Zn > Fe

Mg > Zn > Al > Fe

Al > Zn > Fe > Mg

Mg > Fe > Zn > Al

10 / 46

In the given reaction, Al₂O₃ + NaOH   →  ……X……   +  H₂O, What is element X?

NaAlO₂

Na_{3 Al}

Na_{2 O3}

NaAl_{2 O3}

11 / 46

In electrolytic refining, the cathode is made up of

Pure Metal

Impure Metal

Alloy

Metallic salt

12 / 46

The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as

Smelting

Calcination

Roasting

Refining

13 / 46

The metal which is liquid at room temperature is

Mercury

Bromine

Aluminium

Copper

14 / 46

Bauxite is an ore of

Iron

Aluminium

Copper

Manganese

15 / 46

The number of protons in an atom of an element A is 19 then, the number of electron in its ion A⁺ is

17

21

18

19

16 / 46

The non-metal which is liquid at room temperature is

Mercury

Bromine

Carbon

Helium

17 / 46

Generally non-metals are not lustrous. Which of the following non-metals is lustrous?

Sulphur

Oxygen

Iodine

Nitrogen

18 / 46

Which of the following metals are obtained by electrolysis of their chlorides in molten state?

(i) Na

(ii) Ca

(iii) Fe

(iv) Cu

(i) and (iv)

(iii) and (iv)

(i) and (iii)

(i) and (ii)

19 / 46

 If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of

CuSO₄

CuCO₃

Cu(NO_{3) 2}

CuO

20 / 46

 Stainless steel is very useful material, for our life. In stainless steel, iron is mixed with

Ni and Cr

Cu and Cr

Ni and Cu

Cu and Au

21 / 46

Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of

Gallium

Aluminium

Zinc

silver

22 / 46

Silver articles become black on prolonged exposure to air. This is due to the formation of

Ag_{3 N}

Ag_{3 O}

Ag_{2 S}

Ag_{2 S and Ag3 N}

23 / 46

Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) Au

(ii) Cu

(iii) Na

(iv) K

(i) and (ii)

(i) and (iii)

(ii) and (iii)

(ii) and (iv)

24 / 46

Which of the following metals exist in their native state in nature?

(i) Cu

(ii) Au

(iii) Zn

(iv) Ag

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

(iii) and (iv)

25 / 46

Which one of the following properties is not generally exhibited by ionic compounds?

Solubility in water

Electrical conductivity in solid state

High melting and boiling points

Electrical conductivity in molten state

26 / 46

Which of the following are not ionic compounds?

(i) KCl

(ii) HCl

(iii) CCl₄

(iv) NaCl

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

(i) and (iii)

27 / 46

The composition of aqua-regia is

Dil.HCI : Conc. HNO3 ↔ 3 : 1

Conc. HCI: Dil. HNO3 ↔ 3 : 1

Conc. HCl: Conc. HNO3 ↔ 3 : 1

Dil. HCl: Dil. HNO3 ↔ 3 : 1

28 / 46

Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

H_{2 SO4}

HCI

HNO₃

All of these

29 / 46

What happens when calcium is treated with water?

(i)  It does not react with water.

(ii) It reacts violently with water.

(iii) It reacts less violently with water.

(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.

(i) and (iv)

(ii) and (iii)

(i) and (ii)

(iii) and (iv)

30 / 46

Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

FeO

Fe_{2 O3}

Fe_{3 O4}

Fe_{2 O3 and Fe3 O4}

31 / 46

Which one of the following metals do not react with cold as well as hot water?

Na

Fe

Si

Ca

32 / 46

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

(i) Good thermal conductivity

(ii) Good electrical conductivity

(iii) Ductility

(iv) High melting point

(i) and (ii)

(i) and (iii)

(ii) and (iii)

(i) and (iv)

33 / 46

The ability of metals to be drawn into thin wire is known as

ductility

malleability

sonorousity

conductivity

34 / 46

Electrical wires have a coating of an insulating material. The material, generally used is

Sulphur

Graphite

PVC

Silver

35 / 46

Generally non-metals are non-conductors of electricity. Which of the following is a good conductor of electricity?

Diamond

Graphite

Silver

Copper

36 / 46

Although metals form basic oxides, which of the following metals form an amphoteric oxide?

Na

Ca

Al

Cu

37 / 46

The electronic configurations of three elements X, Y and Z are X — 2, 8: Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

X is a metal

Y is a metal

Z is a non-metal

Y is a non-metal and Z is a metal

38 / 46

Reaction between X and Y forms compound Z. X loses electron and y gains electron. Which of the following properties is not shown by Z?

Has high melting point

Has low melting point

Conducts electricity in molten state

Occurs as solid

39 / 46

Which among the following alloys contain mercury as one of its constituents?

Stainless steel

Alnico

Solder

Zinc amalgam

40 / 46

Which among the following statements is incorrect for magnesium metal?

It burns in oxygen with a dazzling white flame.

It reacts with cold water to form magnesium oxide and evolves hydrogen gas.

It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas.

It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.

41 / 46

Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?

Brass

Bronze

Amalgam

Steel

42 / 46

 An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following.

Mg

Na

P

Ca

43 / 46

During electrolytic refining of zinc, it gets

Deposited on cathode

Deposited on anode

Deposited on cathode as well as anode

Remains in the solution

44 / 46

An electrolytic cell consists of

(i) Positively charged cathode

(ii) Negatively charged anode

(iii) Positively charged anode

(iv) Negatively charged cathode

(i) and (ii)

(iii) and (iv)

(i) and (iii)

(ii) and (iv)

45 / 46

2 mL each of conc. HCl, HNO₃, and a mixture of conc. HCl. and conc. HNO₃, in the ratio of 3 : 1 were taken in test tubes labeled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C. The metal could be

Al

Au

Cu

Au & Pt

46 / 46

Which one of the following four metals would be displaced from the solution of its salts by other three metals?

Mg

Ag

Fe

Si

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Carbon and its compounds

 

10th Science (Chemistry)

Carbon & its Compounds

(Most Important Questions) 

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1 / 45

Which of the following is the molecular formula of cyclobutane?

C_{4 H10}

C_{4 H6}

C_{4 H8}

C_{4 H4}

2 / 45

The property of self-linkage among identical atoms to form long chain compounds is known as

Catenation

Isomerisation

Superposition

Halogenation

3 / 45

Which of the following compounds of carbon does not consist of ions?

CHCl₃

CaCO₃

NaHCO₃

Ca_{2 C}

4 / 45

The I.U.P.A.C name of CH₃CH₂CH=CH₂ is?

3-Butene

Prop-1-ene

But-1-ene

Butyne

5 / 45

Cation is formed when

Atom gains electrons

Atom loses electrons

Proton is lost by the atom

Atom shares electrons

6 / 45

Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of

Addition reaction

Substitution reaction

Displacement reaction

Oxidation reaction

7 / 45

In the following reaction, alkaline KMnO₄ acts as:

Reducing agent

Oxidising agent

Catalyst

Dehydrating agent

8 / 45

Buckminsterfullerene is an allotropic form of

Phosphorus

Sulphur

Carbon

Tin

9 / 45

A molecule of ammonia (NH₃) has

Only single bonds

Only double bonds

Only triple bonds

Two double bonds and one single bond

10 / 45

Which of the following statements are usually correct for carbon compounds? These

(i) Are good conductors of electricity.

(ii) Are poor conductors of electricity.

(iii) Have strong forces of attraction between their molecules.

(iv) Do not have strong forces of attraction between their molecules

(i) and (iii)

(ii) and (iii)

(i) and (iv)

(ii) and (iv)

11 / 45

 Carbon exists in the atmosphere in the form of

Only carbon monoxide

Carbon monoxide in traces and carbon dioxide

Only carbon dioxide

Coal

12 / 45

Which of the following substance produces brisk effervescence with baking soda solution?

Ethanoic acid

Table salt

Vinegar

Sunflower oil

13 / 45

What is denatured alcohol?

Ethyl alcohol which has been made unfit for drinking purpose by adding small amount of poisonous substance

Methyl alcohol which has been made unfit for drinking purpose by adding small amount of poisonous substance

Alcohol having properties of an acid

Ethyl alcohol containing 60% of water by weight

14 / 45

Ester is formed by the reaction between

An acid and an alcohol

An acid and a base

A base and an alcohol

An acid and an alkene

15 / 45

 From which of the following substance pencil lead is formed?

Charcoal

Wood

Lead

Graphite

16 / 45

The organic compounds having functional group are known as

Aldehyde

Ketone

Carboxylic acids

Alcohol

17 / 45

 Which of the followings is the major constituent of the liquefied petroleum gas?

Methane

Ethane

Propane

Butane

18 / 45

How many number of carbon atoms are joined in a spherical molecule of buckminsterfullerene?

30

60

90

120

19 / 45

Which of the following statements about graphite and diamond is true?

They have the same crystal structure

They have the same degree of hardness

They have the same electrical conductivity

They can undergo the same chemical reactions

20 / 45

The first member of alkyne homologous series is

Ethyne

Ethene

Propyne

Methane

21 / 45

The heteroatoms present in CH₃ ─ CH₂ ─ O ─ CH₂ ─ CH₂Cl are

(i) Oxygen

(ii) Carbon

(iii) Hydrogen

(iv) Chlorine

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

(i) and (iv)

22 / 45

The name of the compound, CH₃ ─ CH₂ ─ CHO is

Propanal

Propanone

Ethanol

Ethanal

23 / 45

Which of the following does not belong to the same homologous series?

CH₄

C_{2 H6}

C_{3 H8}

C_{4 H8}

24 / 45

Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of

Helium

Neon

Argon

Krypton

25 / 45

Mineral acids are stronger acids than carboxylic acids because

(i) Mineral acids are completely ionised.

(ii) Carboxylic acids are completely ionised.

(iii) Mineral acids are partially ionised.

(iv) Carboxylic acids are partially ionised

(i) and (iv)

(ii) and (iii)

(i) and (ii)

(iii) and (iv)

26 / 45

Vinegar is a solution of

50% - 60% acetic acid in alcohol

5% - 8% acetic acid in alcohol

5% - 8% acetic acid in water

50%- 60% acetic acid in water

27 / 45

Ethanol reacts with sodium and forms two products. These are

Sodium ethanoate and hydrogen

Sodium ethanoate and oxygen

Sodium ethoxide and hydrogen

Sodium ethoxide and oxygen

28 / 45

Pentane has the molecular formula C₅H₁₂. It has

5 covalent bonds

12 covalent bonds

16 covalent bonds

17 covalent bonds

29 / 45

In the soap micelles

The ionic end of soap is on the surface of the cluster while the carbon chain is in the interior of the cluster

Ionic end of soap is in the interior of the cluster and the carbon chain is out of the cluster

Both ionic end and carbon chain are in the interior of the cluster

Both ionic end and carbon chain are on the exterior of the cluster

30 / 45

Chlorine reacts with saturated hydrocarbons at room temperature in the

absence of sunlight

presence of sunlight

presence of water

presence of hydrochloric acid

31 / 45

Identify the unsaturated compounds from the following.

(i) Propane

(ii) Propene

(iii) Propyne

(iv) Chloropropane

(i) and (ii)

(ii) and (iv)

(iii) and (iv)

(ii) and (iii)

32 / 45

The soap molecule has a

Hydrophilic head and a hydrophobic tail

Hydrophobic head and a hydrophilic tail

Hydrophobic head and a hydrophobic tail

Hydrophilic head and a hydrophilic tail

33 / 45

 In which of the following compounds -OH is the functional group?

Butanone

Butanol

Butanoic

Butanal

34 / 45

 Which of the following statements about graphite and diamond is true?

They have the same crystal structure

They have the same degree of hardness

They have the same electrical conductivity

They can undergo the same chemical reactions

35 / 45

 Solubility of alcohol in water is due to

low density of alcohol

volatile nature of alcohol

ionisation

hydrogen bonding

36 / 45

A functional group mainly determines the

physical properties

chemical properties

both of these

none of these

37 / 45

 —CHO represents the functional group

esters

carboxylic acid

alcohols

aldehydes

38 / 45

 In diamond, each carbon atom is bonded to four other carbon atoms to form

a hexagonal array

a rigid three-dimensional structure

a structure in the shape of a football

a structure of a ring

39 / 45

The first member of the alkyne homologous series is

propyne

ethyne

methane

ethene

40 / 45

 Addition reactions are undergone by

saturated hydrocarbons (alkanes)

only alkenes

only alkynes

both alkenes and alkynes

41 / 45

Why does carbon form compounds mainly by covalent bonding?

There are four electrons in the outermost shell of carbon.

It requires large amount of energy to form C4+ or C4-

It shares its valence electrons to complete its octet

All the above

42 / 45

Name the functional group present in CH₃COCH₃

Alcohol

Carboxylic acid

Ketone

Aldehyde

43 / 45

Ethanol on complete oxidation gives

acetic acid/ethanoic acid

CO2 and water

ethanal

acetone/ethanone

44 / 45

The number of isomers of pentane is

2

3

4

5

45 / 45

C₃H₈ belongs to the homologous series of

Alkynes

Alkenes

Alkanes

Cyclo alkanes

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