16569 + Interview Questions in Physics

1.	Please give a detailed answer about How will the magnetic field intensity at the centre of a circular coil carrying current change,if the current through the coil is doubled and the radius of the coil is halved?
Answer» Please give a detailed answer about How will the magnetic field intensity at the centre of a circular coil carrying current change,if the current through the coil is doubled and the radius of the coil is halved?

Discussion

2.	Solar energy is a __ resource.
Answer» Solar energy is a __ resource.

Discussion

3.	Which mirror produces both real and virtual images? Which mirror produces only virtual image?
Answer» Which mirror produces both real and virtual images? Which mirror produces only virtual image?

3.

Which mirror produces both real and virtual images? Which mirror produces only virtual image?

Answer»

Which mirror produces both real and virtual images?

Which mirror produces only virtual image?

Discussion

4.	What happens in the case of lazy eye?
Answer» What happens in the case of lazy eye?

Discussion

5.	Give some practical examples of an application of couple.
Answer» Give some practical examples of an application of couple.

Discussion

6.	Groundwater will not be depleted due to: (a) process of afforestation (b) establishing thermal power plants (c) process of deforestation (d) cultivation of high yielding varieties of crops
Answer» Groundwater will not be depleted due to: (a) process of afforestation (b) establishing thermal power plants (c) process of deforestation (d) cultivation of high yielding varieties of crops

Discussion

7.	State the condition when the body is in i) Rotational equilibrium ii) Translational equilibrium
Answer» State the condition when the body is in i) Rotational equilibrium ii) Translational equilibrium

7.

State the condition when the body is in i) Rotational equilibrium ii) Translational equilibrium

Answer»

State the condition when the body is in

i) Rotational equilibrium

ii) Translational equilibrium

Discussion

8.	In Mrs. Pinto’s flat there are 6 bulbs of 100 W each, a heater of 2kW and 5 fans of 50 W each. If these are used every day 8 hr , half an hr and 6 hour respectively, calculate the cost of energy consumption for a month of 30 days at the rate of 3.50 per kW h.
Answer» In Mrs. Pinto’s flat there are 6 bulbs of 100 W each, a heater of 2kW and 5 fans of 50 W each. If these are used every day 8 hr , half an hr and 6 hour respectively, calculate the cost of energy consumption for a month of 30 days at the rate of 3.50 per kW h.

8.

In Mrs. Pinto’s flat there are 6 bulbs of 100 W each, a heater of 2kW and 5 fans of 50 W each. If these are used every day 8 hr , half an hr and 6 hour respectively, calculate the cost of energy consumption for a month of 30 days at the rate of 3.50 per kW h.

Answer»

In Mrs. Pinto’s flat there are 6 bulbs of 100 W each, a heater of 2kW and 5 fans of 50 W each. If these are used every day 8 hr , half an hr and 6 hour respectively, calculate the cost of energy consumption for a month of 30 days at the rate of 3.50 per kW h.

Discussion

9.	Give two reasons why different electical appliances in a domestic circuit are connected in parallel.
Answer» Give two reasons why different electical appliances in a domestic circuit are connected in parallel.

Discussion

10.	Why do you not see a spectrum of colours when light passes through a flat pane of glass ?
Answer» Why do you not see a spectrum of colours when light passes through a flat pane of glass ?

Discussion

11.	On what factors does the resistance fo a conductor depend?
Answer» On what factors does the resistance fo a conductor depend?

Discussion

12.	The part of box-type solar cooker which is responsible for producing greenhouse effect is : (a) plane mirror reflector (b) black coating inside the box (c) glass sheet cover (d) utensils placed in the cooker box
Answer» The part of box-type solar cooker which is responsible for producing greenhouse effect is : (a) plane mirror reflector (b) black coating inside the box (c) glass sheet cover (d) utensils placed in the cooker box

Discussion

13.	200 g of hot water at 80°C is added to 300 g of cold water at 10°C. Calculate the final temperature of the mixture of water. Consider the heat taken by the container to be negligible. The specific heat capacity of water is 4200 J kg-1 °C-1
Answer» 200 g of hot water at 80°C is added to 300 g of cold water at 10°C. Calculate the final temperature of the mixture of water. Consider the heat taken by the container to be negligible. The specific heat capacity of water is 4200 J kg^-1 °C^-1

Discussion

14.	A bar magnet is cut into two pieces. Then each of the new pieces is cut into two more pieces and the process is repeated one more time. Find out the number of the north poles thus generated.
Answer» A bar magnet is cut into two pieces. Then each of the new pieces is cut into two more pieces and the process is repeated one more time. Find out the number of the north poles thus generated.

Discussion

15.	Light is a form of electromagnetic radiation. Which of the following statements about light wave is NOT true?
Answer» Light is a form of electromagnetic radiation. Which of the following statements about light wave is NOT true?

Discussion

16.	If a compass is kept exactly between the north poles of a two similar bar magnets, the direction in which the needle will get deflected is?
Answer» If a compass is kept exactly between the north poles of a two similar bar magnets, the direction in which the needle will get deflected is?

16.

If a compass is kept exactly between the north poles of a two similar bar magnets, the direction in which the needle will get deflected is?

Answer»

If a compass is kept exactly between the north poles of a two similar bar magnets, the direction in which the needle will get deflected is?

Discussion

17.	A ball of mass 20g is accelerated by a force from 20m/s to 50 m/s. Calculate the work done by the force. Also calculate the force applied if the displacement brought about by the force is 10m.
Answer» A ball of mass 20g is accelerated by a force from 20m/s to 50 m/s. Calculate the work done by the force. Also calculate the force applied if the displacement brought about by the force is 10m.

Discussion

18.	Water boils at 120o C in a presure cooker. Explain the reason.
Answer» Water boils at $120^{o} C$ in a presure cooker. Explain the reason.

18.

Water boils at 120o C in a presure cooker. Explain the reason.

Answer»

Water boils at $120^{o} C$ in a presure cooker. Explain the reason.

Discussion

19.	If a plant with green leaves and red flowers is kept in a dark room, what will be the observed colour of leaves and flowers in red light?
Answer» If a plant with green leaves and red flowers is kept in a dark room, what will be the observed colour of leaves and flowers in red light?

Discussion

20.	A bar magnet was cut initially into two pieces. Then each of the new pieces was cut into two more pieces, and the process was repeated one more time. Find out the number of north poles generated.
Answer» A bar magnet was cut initially into two pieces. Then each of the new pieces was cut into two more pieces, and the process was repeated one more time. Find out the number of north poles generated.

Discussion

21.	A monochromatic beam of light passes from air into a glass block. When the ray of light passes from air to glass, the wavelength of light changes. As the ray of light passes from air to glass its wavelength will :
Answer» A monochromatic beam of light passes from air into a glass block. When the ray of light passes from air to glass, the wavelength of light changes. As the ray of light passes from air to glass its wavelength will :

Discussion

22.	A uniform metre rule of mass 100 g is balanced on a fulcrum at mark 40 cm by suspending an unknown mass m at the mark 20 cm. (i) Find the value of m. (ii) To which side the rule will tilt if the mass m is moved to the mark 10 cm ? (iii) What is the resultant moment now ? (iv) How can it be balanced by another mass of 50 g ?
Answer» A uniform metre rule of mass 100 g is balanced on a fulcrum at mark 40 cm by suspending an unknown mass m at the mark 20 cm. (i) Find the value of m. (ii) To which side the rule will tilt if the mass m is moved to the mark 10 cm ? (iii) What is the resultant moment now ? (iv) How can it be balanced by another mass of 50 g ?

22.

A uniform metre rule of mass 100 g is balanced on a fulcrum at mark 40 cm by suspending an unknown mass m at the mark 20 cm. (i) Find the value of m. (ii) To which side the rule will tilt if the mass m is moved to the mark 10 cm ? (iii) What is the resultant moment now ? (iv) How can it be balanced by another mass of 50 g ?

Answer»

A uniform metre rule of mass 100 g is balanced on a fulcrum at mark 40 cm by suspending an unknown mass m at the mark 20 cm.

(i) Find the value of m.

(ii) To which side the rule will tilt if the mass m is moved to the mark 10 cm ?

(iii) What is the resultant moment now ?

(iv) How can it be balanced by another mass of 50 g ?

Discussion

23.	Match the following, according to the state of lift with the apparent weight of any person in lift.
Answer» Match the following, according to the state of lift with the apparent weight of any person in lift.

Discussion

24.	the correct curve between potential difference and distance in p-n junction is
Answer» the correct curve between potential difference and distance in p-n junction is

Discussion

25.	A uniform wire of resistance 4 ohm is bent into the form of a circle of radius r. A specimen of the same wire is connected along the diameter of the circle. What is the equivalent resistance across the ends of this wire?
Answer» A uniform wire of resistance 4 ohm is bent into the form of a circle of radius r. A specimen of the same wire is connected along the diameter of the circle. What is the equivalent resistance across the ends of this wire?

Discussion

26.	The frequencies of notes given by flute, guitar and trumpet are respectively 400 Hz, 200 Hz and 500 Hz. Which one of these has the highest pitch?
Answer» The frequencies of notes given by flute, guitar and trumpet are respectively 400 Hz, 200 Hz and 500 Hz. Which one of these has the highest pitch?

Discussion

27.	is the potential difference between two points, when 3 J of work is done in moving 2.3 C of charge between them.
Answer» is the potential difference between two points, when 3 J of work is done in moving 2.3 C of charge between them.

Discussion

28.	How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container? (given that aμw = 43)
Answer» How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container? (given that $_{a} μ_{w}$ = $\frac{4}{3}$ )

Discussion

29.	The potential difference between two points is 35 V and the resistance of the wire connecting the two points is 35 Ω. The current flowing in circuit is
Answer» The potential difference between two points is $35 V$ and the resistance of the wire connecting the two points is $35 Ω$ . The current flowing in circuit is

Discussion

30.	In Fleming’s left hand rule:
Answer» In Fleming’s left hand rule:

Discussion

31.	The light travels with a velocity of 1.5×108 m/s. On entering the second medium its velocity becomes 0.75×108 m/s. what is the refractive index of the second medium with respect to the first medium?
Answer» The light travels with a velocity of $1.5 \times 10^{8}$ m/s. On entering the second medium its velocity becomes $0. 75 \times 10^{8}$ m/s. what is the refractive index of the second medium with respect to the first medium?

Discussion

32.	What is cross section of conductor?
Answer» What is cross section of conductor?

Discussion

33.	(a) State the laws of refraction of light. Give an expression to relate the absolute refractive index of a medium with speed of light in vacuum. (b) The refractive indices of water and glass with respect to air are 43 and 32 respectively. If the speed of light in glass is 2×108 ms−1, find the speed of light in (i) air, (ii) water
Answer» (a) State the laws of refraction of light. Give an expression to relate the absolute refractive index of a medium with speed of light in vacuum. (b) The refractive indices of water and glass with respect to air are $\frac{4}{3}$ and $\frac{3}{2}$ respectively. If the speed of light in glass is $2 \times 10^{8} m s^{- 1}$ , find the speed of light in (i) air, (ii) water

Discussion

34.	Why and how voltage is very high and current is very low in power transmission lines
Answer» Why and how voltage is very high and current is very low in power transmission lines

Discussion

35.	The refractive indices of glass and water with respect to air are 32 and 43 respectively. If the speed of light in glass is 2×108m/s find the speed of light in water.
Answer» The refractive indices of glass and water with respect to air are $\frac{3}{2}$ and $\frac{4}{3}$ respectively. If the speed of light in glass is $2 \times 10^{8} m / s$ find the speed of light in water.

Discussion

36.	(a) Explain why, a stick half immersed in water appears to be bent at the surface. Draw a labelled diagram to illustrate your answer. (b) A coin in a glass tumbler appears to rise as the glass tumbler is slowly filled with water. Name the phenomenon responsible for this effect.
Answer» (a) Explain why, a stick half immersed in water appears to be bent at the surface. Draw a labelled diagram to illustrate your answer. (b) A coin in a glass tumbler appears to rise as the glass tumbler is slowly filled with water. Name the phenomenon responsible for this effect.

Discussion

37.	What is the formula used to calculate the heat of a body?
Answer» What is the formula used to calculate the heat of a body?

Discussion

38.	A ball of mass 200 g falls from a height of 5m. What will be its kinetic energy when it just reaches the ground? (g = 9.8 m s-2)
Answer» A ball of mass 200 g falls from a height of 5m. What will be its kinetic energy when it just reaches the ground? (g = 9.8 m s^-2)

Discussion

39.	A force applied on a body can change its __.
Answer» A force applied on a body can change its __.

Discussion

40.	How do two eyes help us see 3D?
Answer» How do two eyes help us see 3D?

Discussion

41.	What happens if the reverberation time is too high?
Answer» What happens if the reverberation time is too high?

Discussion

42.	If the above bar magnet is broken along the middle line then how many north poles and south poles will we get in the end?
Answer» If the above bar magnet is broken along the middle line then how many north poles and south poles will we get in the end?

42.

If the above bar magnet is broken along the middle line then how many north poles and south poles will we get in the end?

Answer»

If the above bar magnet is broken along the middle line then how many north poles and south poles will we get in the end?

Discussion

43.	In condensation process does the surrounding air decrease its temperature or increase its temperature.
Answer» In condensation process does the surrounding air decrease its temperature or increase its temperature.

Discussion

44.	An ant sees a sugar cube at a distance 10cm away from it. It immediately starts walking towards the cube, lifts it and walks back to its original point in 20 seconds. Assume that the ant walks at a constant speed throughout the journey. Find this speed [in cm/second].
Answer» An ant sees a sugar cube at a distance 10cm away from it. It immediately starts walking towards the cube, lifts it and walks back to its original point in 20 seconds. Assume that the ant walks at a constant speed throughout the journey. Find this speed [in cm/second].

Discussion

45.	Study the given flow chart. Which of the following belongs to category X and category Y respectively?
Answer» Study the given flow chart. Which of the following belongs to category X and category Y respectively?

Discussion

46.	Which of the following is the frequency range of Microwaves?
Answer» Which of the following is the frequency range of Microwaves?

Discussion

47.	Why Cu, Al are used over tungsten, Fe Ni to make fuses?
Answer» Why Cu, Al are used over tungsten, Fe Ni to make fuses?

Discussion

48.	Why should the resistance of: (a) an ammeter be very small? (b) a voltmeter be very large?
Answer» Why should the resistance of: (a) an ammeter be very small? (b) a voltmeter be very large?

Discussion

49.	When is a person said to have developed cataract in his eye ? How is the vision fo aperson having cataract restored ?
Answer» When is a person said to have developed cataract in his eye ? How is the vision fo aperson having cataract restored ?

Discussion

50.	Does adding salt to ice and water cause a temperature drop?
Answer» Does adding salt to ice and water cause a temperature drop?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Please give a detailed answer about How will the magnetic field intensity at the centre of a circular coil carrying current change,if the current through the coil is doubled and the radius of the coil is halved?

Solar energy is a __ resource.

Which mirror produces both real and virtual images? Which mirror produces only virtual image?

What happens in the case of lazy eye?

Give some practical examples of an application of couple.

Groundwater will not be depleted due to: (a) process of afforestation (b) establishing thermal power plants (c) process of deforestation (d) cultivation of high yielding varieties of crops

State the condition when the body is in i) Rotational equilibrium ii) Translational equilibrium

In Mrs. Pinto’s flat there are 6 bulbs of 100 W each, a heater of 2kW and 5 fans of 50 W each. If these are used every day 8 hr , half an hr and 6 hour respectively, calculate the cost of energy consumption for a month of 30 days at the rate of 3.50 per kW h.

Give two reasons why different electical appliances in a domestic circuit are connected in parallel.

Why do you not see a spectrum of colours when light passes through a flat pane of glass ?

On what factors does the resistance fo a conductor depend?

The part of box-type solar cooker which is responsible for producing greenhouse effect is : (a) plane mirror reflector (b) black coating inside the box (c) glass sheet cover (d) utensils placed in the cooker box

200 g of hot water at 80°C is added to 300 g of cold water at 10°C. Calculate the final temperature of the mixture of water. Consider the heat taken by the container to be negligible. The specific heat capacity of water is 4200 J kg-1 °C-1

A bar magnet is cut into two pieces. Then each of the new pieces is cut into two more pieces and the process is repeated one more time. Find out the number of the north poles thus generated.

Light is a form of electromagnetic radiation. Which of the following statements about light wave is NOT true?

If a compass is kept exactly between the north poles of a two similar bar magnets, the direction in which the needle will get deflected is?

A ball of mass 20g is accelerated by a force from 20m/s to 50 m/s. Calculate the work done by the force. Also calculate the force applied if the displacement brought about by the force is 10m.

Water boils at 120o C in a presure cooker. Explain the reason.

If a plant with green leaves and red flowers is kept in a dark room, what will be the observed colour of leaves and flowers in red light?

A bar magnet was cut initially into two pieces. Then each of the new pieces was cut into two more pieces, and the process was repeated one more time. Find out the number of north poles generated.

A monochromatic beam of light passes from air into a glass block. When the ray of light passes from air to glass, the wavelength of light changes. As the ray of light passes from air to glass its wavelength will :

Match the following, according to the state of lift with the apparent weight of any person in lift.

the correct curve between potential difference and distance in p-n junction is

A uniform wire of resistance 4 ohm is bent into the form of a circle of radius r. A specimen of the same wire is connected along the diameter of the circle. What is the equivalent resistance across the ends of this wire?

The frequencies of notes given by flute, guitar and trumpet are respectively 400 Hz, 200 Hz and 500 Hz. Which one of these has the highest pitch?

is the potential difference between two points, when 3 J of work is done in moving 2.3 C of charge between them.

How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container? (given that aμw = 43)

The potential difference between two points is 35 V and the resistance of the wire connecting the two points is 35 Ω. The current flowing in circuit is

In Fleming’s left hand rule:

The light travels with a velocity of 1.5×108 m/s. On entering the second medium its velocity becomes 0.75×108 m/s. what is the refractive index of the second medium with respect to the first medium?

What is cross section of conductor?

Why and how voltage is very high and current is very low in power transmission lines

The refractive indices of glass and water with respect to air are 32 and 43 respectively. If the speed of light in glass is 2×108m/s find the speed of light in water.

(a) Explain why, a stick half immersed in water appears to be bent at the surface. Draw a labelled diagram to illustrate your answer. (b) A coin in a glass tumbler appears to rise as the glass tumbler is slowly filled with water. Name the phenomenon responsible for this effect.

What is the formula used to calculate the heat of a body?

A ball of mass 200 g falls from a height of 5m. What will be its kinetic energy when it just reaches the ground? (g = 9.8 m s-2)

A force applied on a body can change its __.

How do two eyes help us see 3D?

What happens if the reverberation time is too high?

If the above bar magnet is broken along the middle line then how many north poles and south poles will we get in the end?

In condensation process does the surrounding air decrease its temperature or increase its temperature.

An ant sees a sugar cube at a distance 10cm away from it. It immediately starts walking towards the cube, lifts it and walks back to its original point in 20 seconds. Assume that the ant walks at a constant speed throughout the journey. Find this speed [in cm/second].

Study the given flow chart. Which of the following belongs to category X and category Y respectively?

Which of the following is the frequency range of Microwaves?

Why Cu, Al are used over tungsten, Fe Ni to make fuses?

Why should the resistance of: (a) an ammeter be very small? (b) a voltmeter be very large?

When is a person said to have developed cataract in his eye ? How is the vision fo aperson having cataract restored ?

Does adding salt to ice and water cause a temperature drop?