16569 + Interview Questions in Physics

1.	A body of mass m is placed on earth surface is taken to a height of h = 3R, then change in gravitational potential energy is
Answer» A body of mass m is placed on earth surface is taken to a height of h = 3R, then change in gravitational potential energy is

Discussion

2.	Question 10 A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section (a) A2 (b) 3A2 (c) 2A (d) 3A
Answer» Question 10 A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section (a) $\frac{A}{2}$ (b) $\frac{3 A}{2}$ (c) $2 A$ (d) $3 A$

Discussion

3.	what is the focal length of plane mirror
Answer» what is the focal length of plane mirror

Discussion

4.	What is the function of brushes in an electric generator ?
Answer» What is the function of brushes in an electric generator ?

Discussion

5.	A block and tackle system has 5 pulleys and is 90% efficient. If the effort required to lift a load is 1000 N, find the effort required.
Answer» A block and tackle system has 5 pulleys and is 90% efficient. If the effort required to lift a load is 1000 N, find the effort required.

Discussion

6.	Two electric bulbs A and B are designed for the same voltage. Their power ratings are PA and PB respectively, with PA> PB. If they are joined in series with a V-volt supply, then, (choose the correct option).
Answer» Two electric bulbs A and B are designed for the same voltage. Their power ratings are P_A and P_B respectively, with P_A> P_B. If they are joined in series with a V-volt supply, then, (choose the correct option).

Discussion

7.	50g of copper is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 10g of water, the rise in its temperature is (specific heat of copper = 420j/kg/∘C)
Answer» $50 g$ of copper is heated to increase its temperature by $10^{\circ} C$ . If the same quantity of heat is given to $10 g$ of water, the rise in its temperature is (specific heat of copper = $420 j / k g /^{\circ} C$ )

Discussion

8.	What is the full form fo MRI ?
Answer» What is the full form fo MRI ?

Discussion

9.	Assertion (A): Magnetic lines of forces never intersect each other Reason(R): If they intersect, then the imaginary North Pole will move two ways, which is not possible.
Answer» Assertion (A): Magnetic lines of forces never intersect each other Reason(R): If they intersect, then the imaginary North Pole will move two ways, which is not possible.

Discussion

10.	The critical angle for a light ray travelling from a denser to rarer medium is defined as the angle of incidence at which the light refracts at 90°(angle of refraction). If a ray of light travels from water (μw) to air (μa). Find the critical angle.
Answer» The critical angle for a light ray travelling from a denser to rarer medium is defined as the angle of incidence at which the light refracts at 90°(angle of refraction). If a ray of light travels from water (μ_w) to air (μ_a). Find the critical angle.

10.

The critical angle for a light ray travelling from a denser to rarer medium is defined as the angle of incidence at which the light refracts at 90°(angle of refraction). If a ray of light travels from water (μw) to air (μa). Find the critical angle.

Answer»

The critical angle for a light ray travelling from a denser to rarer medium is defined as the angle of incidence at which the light refracts at 90°(angle of refraction).

If a ray of light travels from water (μ_w) to air (μ_a). Find the critical angle.

Discussion

11.	A ray of light goes from water into air. Will it bend towards the normal or away from the normal?
Answer» A ray of light goes from water into air. Will it bend towards the normal or away from the normal?

Discussion

12.	A light ray in passing from water to a medium (a) speeds up, (b) slows down. In each case, (i) give one example of the medium, (ii) state whether the refractive index of medium is equal to, less than or greater than the refractive index of water.
Answer» A light ray in passing from water to a medium (a) speeds up, (b) slows down. In each case, (i) give one example of the medium, (ii) state whether the refractive index of medium is equal to, less than or greater than the refractive index of water.

Discussion

13.	Calculate the escape velocity on the surface of the moon given the mass and radius of the moon to be 7.34×1022kg and 1.74×106m respectively.
Answer» Calculate the escape velocity on the surface of the moon given the mass and radius of the moon to be $7.34 \times 10^{22} k g$ and $1.74 \times 10^{6} m$ respectively.

Discussion

14.	When an alpha particle gains an electron it changes into
Answer» When an alpha particle gains an electron it changes into

Discussion

15.	Define aperture of a spherical mirror.
Answer» Define aperture of a spherical mirror.

Discussion

16.	Where should the pen be placed for it to look the biggest? (and not be blurred)
Answer» Where should the pen be placed for it to look the biggest? (and not be blurred)

Discussion

17.	How can the induced emf in a coil be increased?
Answer» How can the induced emf in a coil be increased?

Discussion

18.	Heating coil in fluorescent lamps are coated with thorium oxide to.
Answer» Heating coil in fluorescent lamps are coated with thorium oxide to.

Discussion

19.	Sound wave having a frequency greater than 20000 Hz is said to be
Answer» Sound wave having a frequency greater than 20000 Hz is said to be

Discussion

20.	Given mass of earth =6.4×1024 kg , radius of earth = 6.4×106 m. Calculate the force of attraction experienced by a man of mass 50 kg.
Answer» Given mass of earth = $6.4 \times 10^{24}$ kg , radius of earth = $6.4 \times 10^{6}$ m. Calculate the force of attraction experienced by a man of mass 50 kg.

Discussion

21.	Does light travel at different speeds in different mediums?
Answer» Does light travel at different speeds in different mediums?

Discussion

22.	Fulcrum (F), load (L), and effort (E) of a simple machine lies in a line. Among the given options which arrangement is correct for class II lever.
Answer» Fulcrum (F), load (L), and effort (E) of a simple machine lies in a line. Among the given options which arrangement is correct for class II lever.

Discussion

23.	Find out the angle of deviation in the diagram shown above?
Answer» Find out the angle of deviation in the diagram shown above?

23.

Find out the angle of deviation in the diagram shown above?

Answer»

Find out the angle of deviation in the diagram shown above?

Discussion

24.	Where is the main fuse connected in a house circuit?
Answer» Where is the main fuse connected in a house circuit?

24.

Where is the main fuse connected in a house circuit?

Answer»

Where is the main fuse connected in a house circuit?

Discussion

25.	Question 1 What kind of mirror - concave, convex or plain - would be best suited for use in a solar cooker? Why?
Answer» Question 1 What kind of mirror - concave, convex or plain - would be best suited for use in a solar cooker? Why?

Discussion

26.	The relationship between the potential difference and the current in a conductor is stated in the form of law. 1. Name the law 2. What does the slope of V-I graph for a conductor represent? 3. Ne the material used for making the conducting wire.
Answer» The relationship between the potential difference and the current in a conductor is stated in the form of law. 1. Name the law 2. What does the slope of V-I graph for a conductor represent? 3. Ne the material used for making the conducting wire.

Discussion

27.	A glass rod rubbed with silk and was found to have +5 micro coulomb of charge .how many electrons got transferred and from which material? Is the answer is 3.123*10^13 electrons..
Answer» A glass rod rubbed with silk and was found to have +5 micro coulomb of charge .how many electrons got transferred and from which material? Is the answer is 3.123*10^13 electrons..

27.

A glass rod rubbed with silk and was found to have +5 micro coulomb of charge .how many electrons got transferred and from which material? Is the answer is 3.123*10^13 electrons..

Answer»

A glass rod rubbed with silk and was found to have +5 micro coulomb of charge .how many electrons got transferred and from which material?

Is the answer is 3.123*10^13 electrons..

Discussion

28.	Choose the statement(s) which states laws of reflection correctly. Statement 1: Angle of incidence is greater than the angle of reflection. Statement 2: Angle of incidence is less than the angle of reflection. Statement 3: Angle of incidence is equal to the angle of reflection. Statement 4: The incident ray, the normal at the point of incidence and the reflected ray lie on the same plane.
Answer» Choose the statement(s) which states laws of reflection correctly. Statement 1: Angle of incidence is greater than the angle of reflection. Statement 2: Angle of incidence is less than the angle of reflection. Statement 3: Angle of incidence is equal to the angle of reflection. Statement 4: The incident ray, the normal at the point of incidence and the reflected ray lie on the same plane.

28.

Choose the statement(s) which states laws of reflection correctly. Statement 1: Angle of incidence is greater than the angle of reflection. Statement 2: Angle of incidence is less than the angle of reflection. Statement 3: Angle of incidence is equal to the angle of reflection. Statement 4: The incident ray, the normal at the point of incidence and the reflected ray lie on the same plane.

Answer»

Choose the statement(s) which states laws of reflection correctly.

Statement 1: Angle of incidence is greater than the angle of reflection.

Statement 2: Angle of incidence is less than the angle of reflection.

Statement 3: Angle of incidence is equal to the angle of reflection.

Statement 4: The incident ray, the normal at the point of incidence and the reflected ray lie on the same plane.

Discussion

29.	A concave lens of focal length 15cm forms an image 10cm from the lens. how far is the object placed from the lens?
Answer» A concave lens of focal length 15cm forms an image 10cm from the lens. how far is the object placed from the lens?

Discussion

30.	why does a magnetic bar hung from a string always comes to rest in north south direction
Answer» why does a magnetic bar hung from a string always comes to rest in north south direction

Discussion

31.	Where can be turbine placed in oceans?
Answer» Where can be turbine placed in oceans?

Discussion

32.	Two resistances R1 and R2 give a combined resistance of 4.5 Ω when in series and 1 Ω when in parallel. The value of resistances are
Answer» Two resistances $R_{1}$ and $R_{2}$ give a combined resistance of 4.5 $Ω$ when in series and 1 $Ω$ when in parallel. The value of resistances are

Discussion

33.	A current passes through a wire from south to north. The direction of the magnetic field at a point vertically above the wire will be from _______to ________
Answer» A current passes through a wire from south to north. The direction of the magnetic field at a point vertically above the wire will be from _______to ________

Discussion

34.	Question 4 (b)What will happen if: The habitat of an animal is disturbed.
Answer» Question 4 (b) What will happen if: The habitat of an animal is disturbed.

Discussion

35.	Make labelled ray diagrams to illustrate the formation of : (a) a real image by a converging mirror. (b) a virtual image by a converging mirror. Mark clearly the pole, focus, centre of curvature and position of object in each case.
Answer» Make labelled ray diagrams to illustrate the formation of : (a) a real image by a converging mirror. (b) a virtual image by a converging mirror. Mark clearly the pole, focus, centre of curvature and position of object in each case.

Discussion

36.	A smart farmer fills up his field entirely with water on an extremely cold night. Why?
Answer» A smart farmer fills up his field entirely with water on an extremely cold night. Why?

Discussion

37.	Steam burns are more painful than the boils formed with boiling water because
Answer» Steam burns are more painful than the boils formed with boiling water because

Discussion

38.	For the circuits shown in figures I and II, the ammeter readings would be________.
Answer» For the circuits shown in figures I and II, the ammeter readings would be________.

38.

For the circuits shown in figures I and II, the ammeter readings would be________.

Answer»

For the circuits shown in figures I and II, the ammeter readings would be________.

Discussion

39.	Induced current found to be highest when coil moves
Answer» Induced current found to be highest when coil moves

Discussion

40.	A piece of stone tied at the end of a thread is whirled in a horizontal circle. The force which provides the centripetal force is
Answer» A piece of stone tied at the end of a thread is whirled in a horizontal circle. The force which provides the centripetal force is

40.

A piece of stone tied at the end of a thread is whirled in a horizontal circle. The force which provides the centripetal force is

Answer»

A piece of stone tied at the end of a thread is whirled in a horizontal circle.

The force which provides the centripetal force is

Discussion

41.	Name any two factors on which the strength of magnetic field produced by a current-carrying solenoid depends. How does it depend on these factors ?
Answer» Name any two factors on which the strength of magnetic field produced by a current-carrying solenoid depends. How does it depend on these factors ?

Discussion

42.	Explain the principle of working of a windmill.
Answer» Explain the principle of working of a windmill.

Discussion

43.	Out of animals of prey and predators, which have their eyes : (i) at the front of their head ? (ii) on the opposite sides of their head ?
Answer» Out of animals of prey and predators, which have their eyes : (i) at the front of their head ? (ii) on the opposite sides of their head ?

Discussion

44.	Fig. 1.31 shows two forces each of magnitude 10 N acting at the points A and B at a separation of 50 cm, in opposite directions, Calculate the resultant moment of the two forces about the point (i) A, (ii) B and (iii) O situated exactly at the middle of the two forces.
Answer» Fig. 1.31 shows two forces each of magnitude 10 N acting at the points A and B at a separation of 50 cm, in opposite directions, Calculate the resultant moment of the two forces about the point (i) A, (ii) B and (iii) O situated exactly at the middle of the two forces.

44.

Fig. 1.31 shows two forces each of magnitude 10 N acting at the points A and B at a separation of 50 cm, in opposite directions, Calculate the resultant moment of the two forces about the point (i) A, (ii) B and (iii) O situated exactly at the middle of the two forces.

Answer»

Fig. 1.31 shows two forces each of magnitude 10 N acting at the points A and B at a separation of 50 cm, in opposite directions, Calculate the resultant moment of the two forces about the point (i) A, (ii) B and (iii) O situated exactly at the middle of the two forces.

Discussion

45.	A number of images are formed, when a pair of mirrors is kept at an angle to each other. This is because ____________.
Answer» A number of images are formed, when a pair of mirrors is kept at an angle to each other. This is because ____________.

Discussion

46.	A ray of light travelling from glass to air is incident at 60∘ on the interface. The light ray will: Use : [μglass = √2, μair = 1]
Answer» A ray of light travelling from glass to air is incident at $60^{\circ}$ on the interface. The light ray will: Use : [ $μ_{g l a s s}$ = $\sqrt{2}$ , $μ_{a i r}$ = 1]

46.

A ray of light travelling from glass to air is incident at 60∘ on the interface. The light ray will: Use : [μglass = √2, μair = 1]

Answer»

A ray of light travelling from glass to air is incident at $60^{\circ}$ on the interface. The light ray will:

Use : [ $μ_{g l a s s}$ = $\sqrt{2}$ , $μ_{a i r}$ = 1]

Discussion

47.	The least distance of distinct vision for a young adult with normal vision is about : (a) 25 m (b) 2.5 cm (c) 25 cm (d) 2.5 m
Answer» The least distance of distinct vision for a young adult with normal vision is about : (a) 25 m (b) 2.5 cm (c) 25 cm (d) 2.5 m

Discussion

48.	The unit of electrical energy is:
Answer» The unit of electrical energy is:

Discussion

49.	What is a solar cell panel ? For what purpose is it used ? State its two main advantages.
Answer» What is a solar cell panel ? For what purpose is it used ? State its two main advantages.

Discussion

50.	A simple pendulum, while oscillating rises to a maximum vertical height of 5 cm from its rest position. Assume its rest position is at ground level. If the mass of bob of the simple pendulum is 500 g and acceleration due to gravity g = 10 m/s2. Find the below: i) The total energy of simple pendulum at any instant while oscillating. ii) The velocity of bob at its resting position.
Answer» A simple pendulum, while oscillating rises to a maximum vertical height of $5 c m$ from its rest position. Assume its rest position is at ground level. If the mass of bob of the simple pendulum is $500 g$ and acceleration due to gravity g = $10 m / s^{2}$ . Find the below: i) The total energy of simple pendulum at any instant while oscillating. ii) The velocity of bob at its resting position.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A body of mass m is placed on earth surface is taken to a height of h = 3R, then change in gravitational potential energy is

Question 10 A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section (a) A2 (b) 3A2 (c) 2A (d) 3A​​​​​​​

what is the focal length of plane mirror

What is the function of brushes in an electric generator ?

A block and tackle system has 5 pulleys and is 90% efficient. If the effort required to lift a load is 1000 N, find the effort required.

Two electric bulbs A and B are designed for the same voltage. Their power ratings are PA and PB respectively, with PA&gt; PB. If they are joined in series with a V-volt supply, then, (choose the correct option).

50g of copper is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 10g of water, the rise in its temperature is (specific heat of copper = 420j/kg/∘C)

What is the full form fo MRI ?

Assertion (A): Magnetic lines of forces never intersect each other Reason(R): If they intersect, then the imaginary North Pole will move two ways, which is not possible.

The critical angle for a light ray travelling from a denser to rarer medium is defined as the angle of incidence at which the light refracts at 90°(angle of refraction). If a ray of light travels from water (μw) to air (μa). Find the critical angle.

A ray of light goes from water into air. Will it bend towards the normal or away from the normal?

A light ray in passing from water to a medium (a) speeds up, (b) slows down. In each case, (i) give one example of the medium, (ii) state whether the refractive index of medium is equal to, less than or greater than the refractive index of water.

Calculate the escape velocity on the surface of the moon given the mass and radius of the moon to be 7.34×1022kg and 1.74×106m respectively.

When an alpha particle gains an electron it changes into

Define aperture of a spherical mirror.

Where should the pen be placed for it to look the biggest? (and not be blurred)

How can the induced emf in a coil be increased?

Heating coil in fluorescent lamps are coated with thorium oxide to.

Sound wave having a frequency greater than 20000 Hz is said to be

Given mass of earth =6.4×1024 kg , radius of earth = 6.4×106 m. Calculate the force of attraction experienced by a man of mass 50 kg.

Does light travel at different speeds in different mediums?

Fulcrum (F), load (L), and effort (E) of a simple machine lies in a line. Among the given options which arrangement is correct for class II lever.

Find out the angle of deviation in the diagram shown above?

Where is the main fuse connected in a house circuit?

Question 1 What kind of mirror - concave, convex or plain - would be best suited for use in a solar cooker? Why?

The relationship between the potential difference and the current in a conductor is stated in the form of law. 1. Name the law 2. What does the slope of V-I graph for a conductor represent? 3. Ne the material used for making the conducting wire.

A glass rod rubbed with silk and was found to have +5 micro coulomb of charge .how many electrons got transferred and from which material? Is the answer is 3.123*10^13 electrons..

A concave lens of focal length 15cm forms an image 10cm from the lens. how far is the object placed from the lens?

why does a magnetic bar hung from a string always comes to rest in north south direction

Where can be turbine placed in oceans?

Two resistances R1 and R2 give a combined resistance of 4.5 Ω when in series and 1 Ω when in parallel. The value of resistances are

A current passes through a wire from south to north. The direction of the magnetic field at a point vertically above the wire will be from _______to ________

Question 4 (b)What will happen if: The habitat of an animal is disturbed.

Make labelled ray diagrams to illustrate the formation of : (a) a real image by a converging mirror. (b) a virtual image by a converging mirror. Mark clearly the pole, focus, centre of curvature and position of object in each case.

A smart farmer fills up his field entirely with water on an extremely cold night. Why?

Steam burns are more painful than the boils formed with boiling water because

For the circuits shown in figures I and II, the ammeter readings would be________.

Induced current found to be highest when coil moves

A piece of stone tied at the end of a thread is whirled in a horizontal circle. The force which provides the centripetal force is

Name any two factors on which the strength of magnetic field produced by a current-carrying solenoid depends. How does it depend on these factors ?

Explain the principle of working of a windmill.

Out of animals of prey and predators, which have their eyes : (i) at the front of their head ? (ii) on the opposite sides of their head ?

Fig. 1.31 shows two forces each of magnitude 10 N acting at the points A and B at a separation of 50 cm, in opposite directions, Calculate the resultant moment of the two forces about the point (i) A, (ii) B and (iii) O situated exactly at the middle of the two forces.

A number of images are formed, when a pair of mirrors is kept at an angle to each other. This is because ____________.

A ray of light travelling from glass to air is incident at 60∘ on the interface. The light ray will: Use : [μglass = √2, μair = 1]

The least distance of distinct vision for a young adult with normal vision is about : (a) 25 m (b) 2.5 cm (c) 25 cm (d) 2.5 m

The unit of electrical energy is:

What is a solar cell panel ? For what purpose is it used ? State its two main advantages.

Question 10 A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section (a) A2 (b) 3A2 (c) 2A (d) 3A

Two electric bulbs A and B are designed for the same voltage. Their power ratings are PA and PB respectively, with PA> PB. If they are joined in series with a V-volt supply, then, (choose the correct option).

A current passes through a wire from south to north. The direction of the magnetic field at a point vertically above the wire will be from _to __