16569 + Interview Questions in Physics

1.	Find the voltmeter and ammeter reading in the above circuit.
Answer» Find the voltmeter and ammeter reading in the above circuit.

1.

Find the voltmeter and ammeter reading in the above circuit.

Answer»

Find the voltmeter and ammeter reading in the above circuit.

Discussion

2.	From the fig. calculate (i) Total resistance of the circuit (ii) Value of ‘R’ (iii) Current flowing through R If Ammeter reads (0.3A)
Answer» From the fig. calculate (i) Total resistance of the circuit (ii) Value of ‘R’ (iii) Current flowing through R If Ammeter reads (0.3A)

2.

From the fig. calculate (i) Total resistance of the circuit (ii) Value of ‘R’ (iii) Current flowing through R If Ammeter reads (0.3A)

Answer»

From the fig. calculate

(i) Total resistance of the circuit

(ii) Value of ‘R’

(iii) Current flowing through R

If Ammeter reads (0.3A)

Discussion

3.	The amount of current that an electric geyser will draw from a 220 V source is, if the resistance of the geyser is 110Ω.
Answer» The amount of current that an electric geyser will draw from a $220 V$ source is, if the resistance of the geyser is $110 Ω$ .

Discussion

4.	We have an electric kettle rated at (60 V,5 A). If the kettle runs for 5 minutes, what is the heat energy generated?
Answer» We have an electric kettle rated at $(60 V, 5 A)$ . If the kettle runs for 5 minutes, what is the heat energy generated?

Discussion

5.	A particle performing a circular motion experiences___.
Answer» A particle performing a circular motion experiences___.

Discussion

6.	A concave mirror is held in water. What would be the change in the focal length of the mirror? [1 MARK]
Answer» A concave mirror is held in water. What would be the change in the focal length of the mirror? [1 MARK]

Discussion

7.	Calculate the pressure developed by a force of 50 N acting on an area of 10 m2.
Answer» Calculate the pressure developed by a force of $50 N$ acting on an area of ${10 m}^{2}$ .

Discussion

8.	In winters the average temperature of a city is −1∘C. There is a big lake in the middle of the city. The temperature in the lake, ____ with an increase in depth.
Answer» In winters the average temperature of a city is $- 1^{\circ}$ C. There is a big lake in the middle of the city. The temperature in the lake, ____ with an increase in depth.

Discussion

9.	Why does the sky appear blue on a clear day ?
Answer» Why does the sky appear blue on a clear day ?

Discussion

10.	High cost and low efficiency are the disadvantages of solar energy. Then then how can it be used in artificial satellites and space probes?
Answer» High cost and low efficiency are the disadvantages of solar energy. Then then how can it be used in artificial satellites and space probes?

Discussion

11.	The near point and far point of a person are at 60cm and 300 cm respectively. Find the power of lens he should use while reading 30 cm. With this lens on the eye, what maximum distance is clearly visible?
Answer» The near point and far point of a person are at 60cm and 300 cm respectively. Find the power of lens he should use while reading 30 cm. With this lens on the eye, what maximum distance is clearly visible?

Discussion

12.	What would happen to Earth, if the Sun suddenly vanishes? (Neglect the gravitational force due to other planets)
Answer» What would happen to Earth, if the Sun suddenly vanishes? (Neglect the gravitational force due to other planets)

Discussion

13.	The magnification produced by a spherical mirror is -3.list 4 imfoinformafrom this statement about the image
Answer» The magnification produced by a spherical mirror is -3.list 4 imfoinformafrom this statement about the image

Discussion

14.	Which of the following statements correctly defines a volt? (a) a volt is a joule per ampere. (b) a volt is a joule per coulomb.
Answer» Which of the following statements correctly defines a volt? (a) a volt is a joule per ampere. (b) a volt is a joule per coulomb.

Discussion

15.	The magnetic effect of current was discovered by : (a) Maxwell (b) Fleming (c) Oersted (d) Faraday
Answer» The magnetic effect of current was discovered by : (a) Maxwell (b) Fleming (c) Oersted (d) Faraday

15.

The magnetic effect of current was discovered by : (a) Maxwell (b) Fleming (c) Oersted (d) Faraday

Answer»

The magnetic effect of current was discovered by :

(a) Maxwell (b) Fleming (c) Oersted (d) Faraday

Discussion

16.	If the refractive index of glass is 32, then the velocity of light in glass would be?
Answer» If the refractive index of glass is $\frac{3}{2}$ , then the velocity of light in glass would be?

Discussion

17.	The diagram shows a fixed coil of several turns connected to a centre zero galvanometer G and a magnet NS which can move in the direction shown in the diagram. (a) Describe the observation in the galvanometer if (i) the magnet is moved rapidly, (ii) the magnet is kept stationary after it has moved into the coil, (iii) the magnet is then rapidly pulled out of the coil. (b) How would the observation in (i) of part (a) change if a more powerful magnet is used?
Answer» The diagram shows a fixed coil of several turns connected to a centre zero galvanometer G and a magnet NS which can move in the direction shown in the diagram. (a) Describe the observation in the galvanometer if (i) the magnet is moved rapidly, (ii) the magnet is kept stationary after it has moved into the coil, (iii) the magnet is then rapidly pulled out of the coil. (b) How would the observation in (i) of part (a) change if a more powerful magnet is used?

17.

The diagram shows a fixed coil of several turns connected to a centre zero galvanometer G and a magnet NS which can move in the direction shown in the diagram. (a) Describe the observation in the galvanometer if (i) the magnet is moved rapidly, (ii) the magnet is kept stationary after it has moved into the coil, (iii) the magnet is then rapidly pulled out of the coil. (b) How would the observation in (i) of part (a) change if a more powerful magnet is used?

Answer»

The diagram shows a fixed coil of several turns connected to a centre zero galvanometer G and a magnet NS which can move in the direction shown in the diagram.

(a) Describe the observation in the galvanometer if (i) the magnet is moved rapidly, (ii) the magnet is kept stationary after it has moved into the coil, (iii) the magnet is then rapidly pulled out of the coil.

(b) How would the observation in (i) of part (a) change if a more powerful magnet is used?

Discussion

18.	Give the characteristics of petroleum.
Answer» Give the characteristics of petroleum.

Discussion

19.	It is established that an electric current through a metallic conductor produces a magnetic field around it.Is there a similar magnetic field produced around a thin beam of moving i)alpha particles ii) photons. Give reason
Answer» It is established that an electric current through a metallic conductor produces a magnetic field around it.Is there a similar magnetic field produced around a thin beam of moving i)alpha particles ii) photons. Give reason

Discussion

20.	What is the difference between angle of deviation and angle of deflection ?
Answer» What is the difference between angle of deviation and angle of deflection ?

Discussion

21.	Name a current which flows only in one direction and can also be obtained from a battery.
Answer» Name a current which flows only in one direction and can also be obtained from a battery.

Discussion

22.	In a laboratory experiment for finding specific latent heat of ice, 100 g of water at 30oC was taken in a calorimeter made of copper and of mass 10 g. When 10 g of ice at 0oC was added to the mixture and kept within the liquid till the ice melted completely, the final temperature of the mixture was found to be 20oC. Calculate the value of the latent heat of fusion of ice from the data discussed above.
Answer» In a laboratory experiment for finding specific latent heat of ice, 100 g of water at 30^oC was taken in a calorimeter made of copper and of mass 10 g. When 10 g of ice at 0^oC was added to the mixture and kept within the liquid till the ice melted completely, the final temperature of the mixture was found to be 20^oC. Calculate the value of the latent heat of fusion of ice from the data discussed above.

22.

In a laboratory experiment for finding specific latent heat of ice, 100 g of water at 30oC was taken in a calorimeter made of copper and of mass 10 g. When 10 g of ice at 0oC was added to the mixture and kept within the liquid till the ice melted completely, the final temperature of the mixture was found to be 20oC. Calculate the value of the latent heat of fusion of ice from the data discussed above.

Answer»

In a laboratory experiment for finding specific latent heat of ice, 100 g of water at 30^oC was taken in a calorimeter made of copper and of mass 10 g. When 10 g of ice at 0^oC was added to the mixture and kept within the liquid till the ice melted completely, the final temperature of the mixture was found to be 20^oC.

Calculate the value of the latent heat of fusion of ice from the data discussed above.

Discussion

23.	At what approximate temperature will water boil in a pressure cooker ? Give a reason in support of your answer.
Answer» At what approximate temperature will water boil in a pressure cooker ? Give a reason in support of your answer.

Discussion

24.	Applications of heating effect of electric current.
Answer» Applications of heating effect of electric current.

Discussion

25.	A man shot a bullet with a speed of 10m/ which penetrates a plank of wood. With what speed should he shoot a bullet to just pass through 10 similar planks
Answer» A man shot a bullet with a speed of 10m/ which penetrates a plank of wood. With what speed should he shoot a bullet to just pass through 10 similar planks

Discussion

26.	If the voltage drops two times that is , net voltage drop V1 +V2 = V then there will be no voltage left to reach the negative terminal means the voltage is 0 right ?
Answer» If the voltage drops two times that is , net voltage drop V1 +V2 = V then there will be no voltage left to reach the negative terminal means the voltage is 0 right ?

Discussion

27.	When we break a magnet into two, both the pieces have N and S poles. What will happen if we repeat this furthwr and fuether until we reach the atomic level?
Answer» When we break a magnet into two, both the pieces have N and S poles. What will happen if we repeat this furthwr and fuether until we reach the atomic level?

Discussion

28.	What do you mean by drift speed of electrons? And how to calculate it
Answer» What do you mean by drift speed of electrons? And how to calculate it

Discussion

29.	If the tube length of the astronomical telescope is 105 cm long and magnifying power is 20 for normal setting. Calculate the focal length of the objective. Given magnifying power(m)= m=f0fe.
Answer» If the tube length of the astronomical telescope is 105 cm long and magnifying power is 20 for normal setting. Calculate the focal length of the objective. Given magnifying power(m)= $m = \frac{f_{0}}{f_{e}}$ .

Discussion

30.	In the above 3 figures, the arrows indicate the direction of force and magnitude of the force is written above/below the arrows. Which box is experiencing balanced force?
Answer» In the above 3 figures, the arrows indicate the direction of force and magnitude of the force is written above/below the arrows. Which box is experiencing balanced force?

30.

In the above 3 figures, the arrows indicate the direction of force and magnitude of the force is written above/below the arrows. Which box is experiencing balanced force?

Answer»

In the above 3 figures, the arrows indicate the direction of force and magnitude of the force is written above/below the arrows. Which box is experiencing balanced force?

Discussion

31.	Light is a form of electromagnetic radiation. Which statement about light waves is NOT true?
Answer» Light is a form of electromagnetic radiation. Which statement about light waves is NOT true?

Discussion

32.	The refractive index of the core of an optical fiber is μ2 and that of the cladding is μ1. The angle of incidence on the face of the core so that the light ray just undergoes total internal reflection at the cladding is
Answer» The refractive index of the core of an optical fiber is $μ_{2}$ and that of the cladding is $μ_{1}$ . The angle of incidence on the face of the core so that the light ray just undergoes total internal reflection at the cladding is

Discussion

33.	If four resistors each of 1 Ω are connected in parallel. The effective resistance will be:
Answer» If four resistors each of $1 Ω$ are connected in parallel. The effective resistance will be:

Discussion

34.	The process of splitting of heavy nuclei into small nuclei is
Answer» The process of splitting of heavy nuclei into small nuclei is

Discussion

35.	One of the surfaces of thin convex lens of focal length 12 cm is silvered and a object is placed at 12 cm in front of lens as shown in figure. If refractive index of lens is 1.5, then distance of image from lens in cm is
Answer» One of the surfaces of thin convex lens of focal length 12 cm is silvered and a object is placed at 12 cm in front of lens as shown in figure. If refractive index of lens is 1.5, then distance of image from lens in cm is

Discussion

36.	State the approximate range of wavelength associated with (a) the ultraviolet rays , (b) the visible light , and (c) infrared rays.
Answer» State the approximate range of wavelength associated with (a) the ultraviolet rays , (b) the visible light , and (c) infrared rays.

Discussion

37.	How do you tune your radio set to a particular station ? Name the phenomenon involved in doing so and define it.
Answer» How do you tune your radio set to a particular station ? Name the phenomenon involved in doing so and define it.

Discussion

38.	Explain with an experiment principle of Electromagnetic induction. Which law will give the direction of electric current?
Answer» Explain with an experiment principle of Electromagnetic induction. Which law will give the direction of electric current?

Discussion

39.	Two free parallel wires carrying currents in opposite directions
Answer» Two free parallel wires carrying currents in opposite directions

Discussion

40.	The diagram in the figure shows a uniform metre rule weighing 100 gf, pivoted at its centre O. Two weights 150 gf and 250 gf hang from the points A and B of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate: (i) the total anticlockwise moment about O, (ii) the total clockwise moment about O, (iii) the difference of anticlockwise and clockwise moments, and (iv) the distance from O where a 100 gf weight should be placed to balance the metre rule.
Answer» The diagram in the figure shows a uniform metre rule weighing 100 gf, pivoted at its centre O. Two weights 150 gf and 250 gf hang from the points A and B of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate: (i) the total anticlockwise moment about O, (ii) the total clockwise moment about O, (iii) the difference of anticlockwise and clockwise moments, and (iv) the distance from O where a 100 gf weight should be placed to balance the metre rule.

40.

The diagram in the figure shows a uniform metre rule weighing 100 gf, pivoted at its centre O. Two weights 150 gf and 250 gf hang from the points A and B of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate: (i) the total anticlockwise moment about O, (ii) the total clockwise moment about O, (iii) the difference of anticlockwise and clockwise moments, and (iv) the distance from O where a 100 gf weight should be placed to balance the metre rule.

Answer»

The diagram in the figure shows a uniform metre rule weighing 100 gf, pivoted at its centre O. Two weights 150 gf and 250 gf hang from the points A and B of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate:

(i) the total anticlockwise moment about O,

(ii) the total clockwise moment about O,

(iii) the difference of anticlockwise and clockwise moments,

and (iv) the distance from O where a 100 gf weight should be placed to balance the metre rule.

Discussion

41.	The diagram in Figure shows a point object P in front of a plane mirror MM1 (a) Complete the diagram by taking two rays from the point P to show the formation of its image. (b) In the diagram, mark the position of eye to see the image. (c) Is the image formed real or virtual ? Explain why ?
Answer» The diagram in Figure shows a point object P in front of a plane mirror $M M_{1}$ (a) Complete the diagram by taking two rays from the point P to show the formation of its image. (b) In the diagram, mark the position of eye to see the image. (c) Is the image formed real or virtual ? Explain why ?

41.

The diagram in Figure shows a point object P in front of a plane mirror MM1 (a) Complete the diagram by taking two rays from the point P to show the formation of its image. (b) In the diagram, mark the position of eye to see the image. (c) Is the image formed real or virtual ? Explain why ?

Answer»

The diagram in Figure shows a point object P in front of a plane mirror $M M_{1}$

(a) Complete the diagram by taking two rays from the point P to show the formation of its image.

(b) In the diagram, mark the position of eye to see the image.

(c) Is the image formed real or virtual ? Explain why ?

Discussion

42.	A divergent lens of focal length 30cm forms the image of an object size 6 cm on the same side as the object at a distamdiof 15 cm from its optical centre . Use lens formula to determine the distance of the object and size of the image
Answer» A divergent lens of focal length 30cm forms the image of an object size 6 cm on the same side as the object at a distamdiof 15 cm from its optical centre . Use lens formula to determine the distance of the object and size of the image

Discussion

43.	Calculate the total cost of running following electrical devices in the month of September, if the rate of unit of electricity is rupees 6 1)electric heater of 100W for 5hrs daily 2)electric refrigerator of 400W for 10hrs daily
Answer» Calculate the total cost of running following electrical devices in the month of September, if the rate of unit of electricity is rupees 6 1)electric heater of 100W for 5hrs daily 2)electric refrigerator of 400W for 10hrs daily

43.

Calculate the total cost of running following electrical devices in the month of September, if the rate of unit of electricity is rupees 6 1)electric heater of 100W for 5hrs daily 2)electric refrigerator of 400W for 10hrs daily

Answer»

Calculate the total cost of running following electrical devices in the month of September, if the rate of unit of electricity is rupees 6

1)electric heater of 100W for 5hrs daily

2)electric refrigerator of 400W for 10hrs daily

Discussion

44.	Question 35 The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens? What is the nature of the image at a distance of 80 cm and the lens?
Answer» Question 35 The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens? What is the nature of the image at a distance of 80 cm and the lens?

Discussion

45.	A mass of 5 kg is held at a position 2 m away from a mass of 10 kg. What is the gravitational attraction between the two masses? Take value of G as 6.67×10−11Nm2kg−2
Answer» A mass of 5 kg is held at a position 2 m away from a mass of 10 kg. What is the gravitational attraction between the two masses? Take value of $G$ as $6.67 \times 10^{- 11} N m^{2} k g^{- 2}$

Discussion

46.	The expression for calculating electrical power in terms of current and resistance.
Answer» The expression for calculating electrical power in terms of current and resistance.

Discussion

47.	Of what material are the control rods of a nuclear reactor made ?
Answer» Of what material are the control rods of a nuclear reactor made ?

Discussion

48.	The power obtained in a reactor using U235 disintegration is 1000 kW . What is the mass decay of U235 per hour ?
Answer» The power obtained in a reactor using U²³⁵ disintegration is 1000 kW . What is the mass decay of U²³⁵ per hour ?

Discussion

49.	In a certain murder investigation, it was important to discover whether the victim was long-sighted or short-sighted. How could a detective decide by examining his spectacles ?
Answer» In a certain murder investigation, it was important to discover whether the victim was long-sighted or short-sighted. How could a detective decide by examining his spectacles ?

Discussion

50.	What do you understand by the kinetic energy of a body?
Answer» What do you understand by the kinetic energy of a body?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Find the voltmeter and ammeter reading in the above circuit.

From the fig. calculate (i) Total resistance of the circuit (ii) Value of ‘R’ (iii) Current flowing through R If Ammeter reads (0.3A)

The amount of current that an electric geyser will draw from a 220 V source is, if the resistance of the geyser is 110Ω.

We have an electric kettle rated at (60 V,5 A). If the kettle runs for 5 minutes, what is the heat energy generated?

A particle performing a circular motion experiences___.

A concave mirror is held in water. What would be the change in the focal length of the mirror? [1 MARK]

Calculate the pressure developed by a force of 50 N acting on an area of 10 m2.

In winters the average temperature of a city is −1∘C. There is a big lake in the middle of the city. The temperature in the lake, ____ with an increase in depth.

Why does the sky appear blue on a clear day ?

High cost and low efficiency are the disadvantages of solar energy. Then then how can it be used in artificial satellites and space probes?

The near point and far point of a person are at 60cm and 300 cm respectively. Find the power of lens he should use while reading 30 cm. With this lens on the eye, what maximum distance is clearly visible?

What would happen to Earth, if the Sun suddenly vanishes? (Neglect the gravitational force due to other planets)

The magnification produced by a spherical mirror is -3.list 4 imfoinformafrom this statement about the image

Which of the following statements correctly defines a volt? (a) a volt is a joule per ampere. (b) a volt is a joule per coulomb.

The magnetic effect of current was discovered by : (a) Maxwell (b) Fleming (c) Oersted (d) Faraday

If the refractive index of glass is 32, then the velocity of light in glass would be?

Give the characteristics of petroleum.

It is established that an electric current through a metallic conductor produces a magnetic field around it.Is there a similar magnetic field produced around a thin beam of moving i)alpha particles ii) photons. Give reason

What is the difference between angle of deviation and angle of deflection ?

Name a current which flows only in one direction and can also be obtained from a battery.

At what approximate temperature will water boil in a pressure cooker ? Give a reason in support of your answer.

Applications of heating effect of electric current.

A man shot a bullet with a speed of 10m/ which penetrates a plank of wood. With what speed should he shoot a bullet to just pass through 10 similar planks

If the voltage drops two times that is , net voltage drop V1 +V2 = V then there will be no voltage left to reach the negative terminal means the voltage is 0 right ?

When we break a magnet into two, both the pieces have N and S poles. What will happen if we repeat this furthwr and fuether until we reach the atomic level?

What do you mean by drift speed of electrons? And how to calculate it

If the tube length of the astronomical telescope is 105 cm long and magnifying power is 20 for normal setting. Calculate the focal length of the objective. Given magnifying power(m)= m=f0fe.

In the above 3 figures, the arrows indicate the direction of force and magnitude of the force is written above/below the arrows. Which box is experiencing balanced force?

Light is a form of electromagnetic radiation. Which statement about light waves is NOT true?

The refractive index of the core of an optical fiber is μ2 and that of the cladding is μ1. The angle of incidence on the face of the core so that the light ray just undergoes total internal reflection at the cladding is

If four resistors each of 1 Ω are connected in parallel. The effective resistance will be:

The process of splitting of heavy nuclei into small nuclei is

One of the surfaces of thin convex lens of focal length 12 cm is silvered and a object is placed at 12 cm in front of lens as shown in figure. If refractive index of lens is 1.5, then distance of image from lens in cm is

State the approximate range of wavelength associated with (a) the ultraviolet rays , (b) the visible light , and (c) infrared rays.

How do you tune your radio set to a particular station ? Name the phenomenon involved in doing so and define it.

Explain with an experiment principle of Electromagnetic induction. Which law will give the direction of electric current?

Two free parallel wires carrying currents in opposite directions

The diagram in Figure shows a point object P in front of a plane mirror MM1 (a) Complete the diagram by taking two rays from the point P to show the formation of its image. (b) In the diagram, mark the position of eye to see the image. (c) Is the image formed real or virtual ? Explain why ?

A divergent lens of focal length 30cm forms the image of an object size 6 cm on the same side as the object at a distamdiof 15 cm from its optical centre . Use lens formula to determine the distance of the object and size of the image

Calculate the total cost of running following electrical devices in the month of September, if the rate of unit of electricity is rupees 6 1)electric heater of 100W for 5hrs daily 2)electric refrigerator of 400W for 10hrs daily

A mass of 5 kg is held at a position 2 m away from a mass of 10 kg. What is the gravitational attraction between the two masses? Take value of G as 6.67×10−11Nm2kg−2

The expression for calculating electrical power in terms of current and resistance.

Of what material are the control rods of a nuclear reactor made ?

The power obtained in a reactor using U235 disintegration is 1000 kW . What is the mass decay of U235 per hour ?

In a certain murder investigation, it was important to discover whether the victim was long-sighted or short-sighted. How could a detective decide by examining his spectacles ?

What do you understand by the kinetic energy of a body?