16569 + Interview Questions in Physics

1.	A proton is placed in an uniform electric field directed along the position x-axis. In which direction will it tend to move?
Answer» A proton is placed in an uniform electric field directed along the position x-axis. In which direction will it tend to move?

Discussion

2.	A light ray is incident from a denser medium on the boundary separating it from a rarer medium at an angle of incidence equal to the critical angle. What is the angle of refraction for the ray?
Answer» A light ray is incident from a denser medium on the boundary separating it from a rarer medium at an angle of incidence equal to the critical angle. What is the angle of refraction for the ray?

Discussion

3.	A man uses a crowbar of length 2.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever used and calculate the effort needed.
Answer» A man uses a crowbar of length 2.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever used and calculate the effort needed.

3.

A man uses a crowbar of length 2.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever used and calculate the effort needed.

Answer»

A man uses a crowbar of length 2.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever used and calculate the effort needed.

Discussion

4.	When light travels from a denser to a rarer medium, it bends -
Answer» When light travels from a denser to a rarer medium, it bends -

Discussion

5.	Why is it advised to cut off power supply and switch off all electrical appliances at the time of a flood?
Answer» Why is it advised to cut off power supply and switch off all electrical appliances at the time of a flood?

Discussion

6.	Two coils are placed close to each other. Then the mutual inductance of the pair of coils depends upon ____
Answer» Two coils are placed close to each other. Then the mutual inductance of the pair of coils depends upon ____

Discussion

7.	Explain the cathode ray tube?
Answer» Explain the cathode ray tube?

Discussion

8.	Which part of human eye changes its shape??
Answer» Which part of human eye changes its shape??

Discussion

9.	What is power of bulb rated at 2.5V ,500milliampere .
Answer» What is power of bulb rated at 2.5V ,500milliampere .

Discussion

10.	Explain the term drift velocity of electrons in a conductor. Obtain the expression for the current through a conductor in terms of drift velocity.
Answer» Explain the term drift velocity of electrons in a conductor. Obtain the expression for the current through a conductor in terms of drift velocity.

Discussion

11.	In a voltmeter there are 20 divisions between the zero mark and 0.5 volt mark calculate the least count of voltmeter
Answer» In a voltmeter there are 20 divisions between the zero mark and 0.5 volt mark calculate the least count of voltmeter

Discussion

12.	What is the electric potential of the neutral wire in a mains supply cable ?
Answer» What is the electric potential of the neutral wire in a mains supply cable ?

Discussion

13.	A hot plate of an electric oven connected to a 240 V line has two resistance coils A and B, each of 24Ω resistance, which may be used separately, in series, or in parallel. What are the currents through the coils in the three cases? [3 MARKS]
Answer» A hot plate of an electric oven connected to a 240 V line has two resistance coils A and B, each of 24 $Ω$ resistance, which may be used separately, in series, or in parallel. What are the currents through the coils in the three cases? [3 MARKS]

Discussion

14.	Which of the following is incorrect about Beta-rays?
Answer» Which of the following is incorrect about Beta-rays?

Discussion

15.	what type of current used for household and cell
Answer» what type of current used for household and cell

Discussion

16.	Calculate acceleration due to gravity at a height of 2000 km above the Earth's surface. Mass of Earth = 6×1024 kg, radius of Earth = 6.4×106 m and (Gravitational constant, G =6.7×10−11Nm2kg−2)
Answer» Calculate acceleration due to gravity at a height of $2000 k m$ above the Earth's surface. Mass of Earth = $6 \times 10^{24} k g$ , radius of Earth = $6.4 \times 10^{6}$ m and (Gravitational constant, G $= 6.7 \times 10^{- 11} N m^{2} k g^{- 2}$ )

Discussion

17.	A car with a mass of 500 kg travels an uphill between two points whose height difference is 100 meters. Work done by the gravity is (Assume acceleration due to gravity g=10 m/s2)
Answer» A car with a mass of 500 kg travels an uphill between two points whose height difference is 100 meters. Work done by the gravity is (Assume acceleration due to gravity $g = 10 m / s^{2}$ )

Discussion

18.	Why sky is blue. Explain through the phenomenon of scattering of light .
Answer» Why sky is blue. Explain through the phenomenon of scattering of light .

Discussion

19.	What is electromagnetism give me a 2-3 line defination for 1 mark question
Answer» What is electromagnetism give me a 2-3 line defination for 1 mark question

Discussion

20.	The world's known coal reserves are expected to last for about : (a) 200 years (b) 400 years (c) 500 years (d) 100 years
Answer» The world's known coal reserves are expected to last for about : (a) 200 years (b) 400 years (c) 500 years (d) 100 years

Discussion

21.	A radiation P is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiation P is : (a) infrared radiation (b) visible light (c) ultraviolet radiation (d) X -rays.
Answer» A radiation P is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiation P is : (a) infrared radiation (b) visible light (c) ultraviolet radiation (d) X -rays.

21.

A radiation P is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiation P is : (a) infrared radiation (b) visible light (c) ultraviolet radiation (d) X -rays.

Answer»

A radiation P is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiation P is :

(a) infrared radiation

(b) visible light

(c) ultraviolet radiation

(d) X -rays.

Discussion

22.	Which of these is not a renewable source of energy?
Answer» Which of these is not a renewable source of energy?

Discussion

23.	Name the material used as i) Standard Resistors ii) Heating Element
Answer» Name the material used as i) Standard Resistors ii) Heating Element

23.

Name the material used as i) Standard Resistors ii) Heating Element

Answer»

Name the material used as

i) Standard Resistors

ii) Heating Element

Discussion

24.	Two bulbs are marked 110 W, 220 V and 55 W, 110 V respectively. Calculate the ratio of their resistance.
Answer» Two bulbs are marked 110 W, 220 V and 55 W, 110 V respectively. Calculate the ratio of their resistance.

Discussion

25.	In an electric motor, the direction of current in the coil changes once in each : (a) two rotations (b) one rotation (c) half rotation (d) one-fourth rotation
Answer» In an electric motor, the direction of current in the coil changes once in each : (a) two rotations (b) one rotation (c) half rotation (d) one-fourth rotation

25.

In an electric motor, the direction of current in the coil changes once in each : (a) two rotations (b) one rotation (c) half rotation (d) one-fourth rotation

Answer»

In an electric motor, the direction of current in the coil changes once in each :

(a) two rotations (b) one rotation (c) half rotation (d) one-fourth rotation

Discussion

26.	For a book lying on a table, the downward weight gets balanced by___.
Answer» For a book lying on a table, the downward weight gets balanced by___.

Discussion

27.	A car rated at 20kW is moving at 72 km/hr. Calculate the force applied by its engine.
Answer» A car rated at 20kW is moving at 72 km/hr. Calculate the force applied by its engine.

Discussion

28.	(a) Write down the formula which relates electric charge, time and electric current. (b) A radio set draws a current of 0.36 A for 15 minutes. Calculate the amount of electric charge that flows through the circuit.
Answer» (a) Write down the formula which relates electric charge, time and electric current. (b) A radio set draws a current of 0.36 A for 15 minutes. Calculate the amount of electric charge that flows through the circuit.

Discussion

29.	Calculate the focal length of a convex lens which produces a virtual image at a distance of 50 cm of an object placed 20 cm in front of it.
Answer» Calculate the focal length of a convex lens which produces a virtual image at a distance of 50 cm of an object placed 20 cm in front of it.

Discussion

30.	Why does the sky appear blue?
Answer» Why does the sky appear blue?

Discussion

31.	Since in space there is no friction, so if a body is given a force once then does it stop or does it continues to move or do work without stopping forever (until something stops it )?
Answer» Since in space there is no friction, so if a body is given a force once then does it stop or does it continues to move or do work without stopping forever (until something stops it )?

Discussion

32.	State two differences between the forced and resonant vibrations.
Answer» State two differences between the forced and resonant vibrations.

Discussion

33.	The resistances R1 and R2 are connected in parallel. The equivalent resistance Rp of the combination is: (a) R1+R2 (b) R1−R2 (c) R1R2R1+R2 (D) R1+R2R1R2
Answer» The resistances $R_{1}$ and $R_{2}$ are connected in parallel. The equivalent resistance $R_{p}$ of the combination is: (a) $R_{1} + R_{2}$ (b) $R_{1} - R_{2}$ (c) $\frac{R_{1} R_{2}}{R_{1} + R_{2}}$ (D) $\frac{R_{1} + R_{2}}{R_{1} R_{2}}$

Discussion

34.	If focal length of a convex lens is 80 cm, what will be the power of the lens (in diopter)?
Answer» If focal length of a convex lens is 80 cm, what will be the power of the lens (in diopter)?

Discussion

35.	Draw a labelled diagram of a device you would use to transform 200 V a.c. to 15 V a.c. Name the device and explain how does it work. Give its two uses.
Answer» Draw a labelled diagram of a device you would use to transform 200 V a.c. to 15 V a.c. Name the device and explain how does it work. Give its two uses.

Discussion

36.	Work done in moving a unit positive test charge from one point to other inside an electric field is called ___.
Answer» Work done in moving a unit positive test charge from one point to other inside an electric field is called ___.

Discussion

37.	On a see-saw two children of masses 30kg and 50kg are sitting on one side of it at distances 2 m and 2.5m respectively from its middle. Where should a man of mass 75 kg sit to balance it?
Answer» On a see-saw two children of masses 30kg and 50kg are sitting on one side of it at distances 2 m and 2.5m respectively from its middle. Where should a man of mass 75 kg sit to balance it?

Discussion

38.	The power of a lens is + 2.0 D. Its focal length should be : (a) 100 cm (b) 50 cm (c) 25 cm (d) 40 cm
Answer» The power of a lens is + 2.0 D. Its focal length should be : (a) 100 cm (b) 50 cm (c) 25 cm (d) 40 cm

Discussion

39.	An interior designer designed steps in the house in such a way that the height of the step increases and decreases by 10% alternatively based on the height of the previous step. The height of the 3rd step is 20 cm. What is the height of the 5th step if the height of the 3rd step is greater than the height of the 2nd step?
Answer» An interior designer designed steps in the house in such a way that the height of the step increases and decreases by $10 %$ alternatively based on the height of the previous step. The height of the $3 r d$ step is $20$ cm. What is the height of the $5 t h$ step if the height of the $3 r d$ step is greater than the height of the $2 n d$ step?

Discussion

40.	Find the size distance and Nature of image formed of an object size 1cm height a distance 15cm infront of concave mirror of focal length.
Answer» Find the size distance and Nature of image formed of an object size 1cm height a distance 15cm infront of concave mirror of focal length.

Discussion

41.	The screw head is provided with a __ arrangement to prevent the user from exerting undue pressure.
Answer» The screw head is provided with a __ arrangement to prevent the user from exerting undue pressure.

Discussion

42.	Does an induction cooker work in the principle of electromagnetic induction ? If so then how?
Answer» Does an induction cooker work in the principle of electromagnetic induction ? If so then how?

Discussion

43.	The time rate of change of momentum is called:
Answer» The time rate of change of momentum is called:

Discussion

44.	What is the colour code for the insulation on the (a) live, (b) neutral, and (c) earth wire?
Answer» What is the colour code for the insulation on the (a) live, (b) neutral, and (c) earth wire?

44.

What is the colour code for the insulation on the (a) live, (b) neutral, and (c) earth wire?

Answer»

What is the colour code for the insulation on the (a) live, (b) neutral, and (c) earth wire?

Discussion

45.	How is the mechanical advantage related to the velocity ratio fro (i) an ideal machine, (ii) a pratical machine ?
Answer» How is the mechanical advantage related to the velocity ratio fro (i) an ideal machine, (ii) a pratical machine ?

Discussion

46.	Which part of India receives precipitation generally in the form of snowfall?
Answer» Which part of India receives precipitation generally in the form of snowfall?

Discussion

47.	What is the effect of temperature on cruent flowing through circuit?
Answer» What is the effect of temperature on cruent flowing through circuit?

Discussion

48.	please give me the full revision notes for the chapter magnetic effects of electric current
Answer» please give me the full revision notes for the chapter magnetic effects of electric current

Discussion

49.	A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z:
Answer» A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z:

Discussion

50.	The work done in moving a unit positive charge from one end of a conductor to its other end is 10 J. Voltage across the ends of the conductor is .
Answer» The work done in moving a unit positive charge from one end of a conductor to its other end is $10 J$ . Voltage across the ends of the conductor is .

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A proton is placed in an uniform electric field directed along the position x-axis. In which direction will it tend to move?

A light ray is incident from a denser medium on the boundary separating it from a rarer medium at an angle of incidence equal to the critical angle. What is the angle of refraction for the ray?

A man uses a crowbar of length 2.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever used and calculate the effort needed.

When light travels from a denser to a rarer medium, it bends -

Why is it advised to cut off power supply and switch off all electrical appliances at the time of a flood?

Two coils are placed close to each other. Then the mutual inductance of the pair of coils depends upon ____

Explain the cathode ray tube?

Which part of human eye changes its shape??

What is power of bulb rated at 2.5V ,500milliampere .

Explain the term drift velocity of electrons in a conductor. Obtain the expression for the current through a conductor in terms of drift velocity.

In a voltmeter there are 20 divisions between the zero mark and 0.5 volt mark calculate the least count of voltmeter

What is the electric potential of the neutral wire in a mains supply cable ?

A hot plate of an electric oven connected to a 240 V line has two resistance coils A and B, each of 24Ω resistance, which may be used separately, in series, or in parallel. What are the currents through the coils in the three cases? [3 MARKS]

Which of the following is incorrect about Beta-rays?

what type of current used for household and cell

Calculate acceleration due to gravity at a height of 2000 km above the Earth's surface. Mass of Earth = 6×1024 kg, radius of Earth = 6.4×106 m and (Gravitational constant, G =6.7×10−11Nm2kg−2)

A car with a mass of 500 kg travels an uphill between two points whose height difference is 100 meters. Work done by the gravity is (Assume acceleration due to gravity g=10 m/s2)

Why sky is blue. Explain through the phenomenon of scattering of light .

What is electromagnetism give me a 2-3 line defination for 1 mark question

The world's known coal reserves are expected to last for about : (a) 200 years (b) 400 years (c) 500 years (d) 100 years

A radiation P is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiation P is : (a) infrared radiation (b) visible light (c) ultraviolet radiation (d) X -rays.

Which of these is not a renewable source of energy?

Name the material used as i) Standard Resistors ii) Heating Element

Two bulbs are marked 110 W, 220 V and 55 W, 110 V respectively. Calculate the ratio of their resistance.

In an electric motor, the direction of current in the coil changes once in each : (a) two rotations (b) one rotation (c) half rotation (d) one-fourth rotation

For a book lying on a table, the downward weight gets balanced by___.

A car rated at 20kW is moving at 72 km/hr. Calculate the force applied by its engine.

(a) Write down the formula which relates electric charge, time and electric current. (b) A radio set draws a current of 0.36 A for 15 minutes. Calculate the amount of electric charge that flows through the circuit.

Calculate the focal length of a convex lens which produces a virtual image at a distance of 50 cm of an object placed 20 cm in front of it.

Why does the sky appear blue?

Since in space there is no friction, so if a body is given a force once then does it stop or does it continues to move or do work without stopping forever (until something stops it )?

State two differences between the forced and resonant vibrations.

The resistances R1 and R2 are connected in parallel. The equivalent resistance Rp of the combination is: (a) R1+R2 (b) R1−R2 (c) R1R2R1+R2 (D) R1+R2R1R2

If focal length of a convex lens is 80 cm, what will be the power of the lens (in diopter)?

Draw a labelled diagram of a device you would use to transform 200 V a.c. to 15 V a.c. Name the device and explain how does it work. Give its two uses.

Work done in moving a unit positive test charge from one point to other inside an electric field is called ___.

On a see-saw two children of masses 30kg and 50kg are sitting on one side of it at distances 2 m and 2.5m respectively from its middle. Where should a man of mass 75 kg sit to balance it?

The power of a lens is + 2.0 D. Its focal length should be : (a) 100 cm (b) 50 cm (c) 25 cm (d) 40 cm

Find the size distance and Nature of image formed of an object size 1cm height a distance 15cm infront of concave mirror of focal length.

The screw head is provided with a __ arrangement to prevent the user from exerting undue pressure.

Does an induction cooker work in the principle of electromagnetic induction ? If so then how?

The time rate of change of momentum is called:

What is the colour code for the insulation on the (a) live, (b) neutral, and (c) earth wire?

How is the mechanical advantage related to the velocity ratio fro (i) an ideal machine, (ii) a pratical machine ?

Which part of India receives precipitation generally in the form of snowfall?

What is the effect of temperature on cruent flowing through circuit?

please give me the full revision notes for the chapter magnetic effects of electric current

A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z:

The work done in moving a unit positive charge from one end of a conductor to its other end is 10 J. Voltage across the ends of the conductor is .