16569 + Interview Questions in Physics

1.	A ray of light passes through the focus of the mirror. After reflection, it
Answer» A ray of light passes through the focus of the mirror. After reflection, it

Discussion

2.	A ray of light is incident on the pole of a concave mirror at an angle of 50o. At what angle will it reflect?
Answer» A ray of light is incident on the pole of a concave mirror at an angle of 50^o. At what angle will it reflect?

Discussion

3.	In the above circuit, a battery is connected with a coiled wire around a circular iron ring. On the other end, a galvanometer is connected in a similar way. In which of the below-mentioned condition will we see deflection in the galvanometer?
Answer» In the above circuit, a battery is connected with a coiled wire around a circular iron ring. On the other end, a galvanometer is connected in a similar way. In which of the below-mentioned condition will we see deflection in the galvanometer?

3.

In the above circuit, a battery is connected with a coiled wire around a circular iron ring. On the other end, a galvanometer is connected in a similar way. In which of the below-mentioned condition will we see deflection in the galvanometer?

Answer»

In the above circuit, a battery is connected with a coiled wire around a circular iron ring. On the other end, a galvanometer is connected in a similar way. In which of the below-mentioned condition will we see deflection in the galvanometer?

Discussion

4.	When resistors R1 and R2 are connected in series across a battery of potential difference V, the power dissipated by the resistors are P1 and P2 respectively. When they are connected in parallel across a battery of potential difference E, the power dissipated is P3 and P4 respectively. Which one of the following is true?
Answer» When resistors $R_{1} a n d R_{2}$ are connected in series across a battery of potential difference V, the power dissipated by the resistors are $P_{1} a n d P_{2}$ respectively. When they are connected in parallel across a battery of potential difference E, the power dissipated is $P_{3} a n d P_{4}$ respectively. Which one of the following is true?

Discussion

5.	Fuse wire is connected in series with:
Answer» Fuse wire is connected in series with:

Discussion

6.	Among the given options which element is used in making solar cells?
Answer» Among the given options which element is used in making solar cells?

Discussion

7.	The speed of light in glass, on increasing the wavelength of light in glass
Answer» The speed of light in glass, on increasing the wavelength of light in glass

Discussion

8.	(a) What do you understand by a simple machine ? (b) State the principle of an ideal machine.
Answer» (a) What do you understand by a simple machine ? (b) State the principle of an ideal machine.

8.

(a) What do you understand by a simple machine ? (b) State the principle of an ideal machine.

Answer»

(a) What do you understand by a simple machine ?

(b) State the principle of an ideal machine.

Discussion

9.	Question 4 (b) How can you as an individual contribute or make a difference to the management of (b) water resources?
Answer» Question 4 (b) How can you as an individual contribute or make a difference to the management of (b) water resources?

Discussion

10.	__ is the surrounding where an organism live.
Answer» __ is the surrounding where an organism live.

Discussion

11.	What characteristic property of light is responsible for the blue colour of sky?
Answer» What characteristic property of light is responsible for the blue colour of sky?

Discussion

12.	Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.
Answer» Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.

Discussion

13.	Three lenses A, B and C produce magnification of 1, 2 and 3 respectively. The net magnification of the combination is
Answer» Three lenses A, B and C produce magnification of 1, 2 and 3 respectively. The net magnification of the combination is

Discussion

14.	AC current can be converted to DC current using __.
Answer» AC current can be converted to DC current using __.

Discussion

15.	For what purpose are the transformers used? Can they be used with a direct current source?
Answer» For what purpose are the transformers used? Can they be used with a direct current source?

Discussion

16.	A real image of half the object size is obtained in a concave spherical mirror with a radius of curvature of 40 cm. The distance of the object and that of its image from the mirror will be respectively:
Answer» A real image of half the object size is obtained in a concave spherical mirror with a radius of curvature of $40 c m$ . The distance of the object and that of its image from the mirror will be respectively:

Discussion

17.	In a full wave rectifier, the current in each diode flows for
Answer» In a full wave rectifier, the current in each diode flows for

Discussion

18.	Discuss the major hazards of nuclear power plants. [3 MARKS]
Answer» Discuss the major hazards of nuclear power plants. [3 MARKS]

Discussion

19.	Statement 1: Tides are periodic rise and fall of the ocean's surface. Statement 2: Tides are caused by combined effects of the gravitational forces exerted by the Moon and the Sun. Choose the correct option.
Answer» Statement 1: Tides are periodic rise and fall of the ocean's surface. Statement 2: Tides are caused by combined effects of the gravitational forces exerted by the Moon and the Sun. Choose the correct option.

Discussion

20.	In a series combination of electrical appliances, connected to a constant voltage power supply, if we add one more appliance with resistance R in series, then the total electrical power consumed in the circuit will__.
Answer» In a series combination of electrical appliances, connected to a constant voltage power supply, if we add one more appliance with resistance R in series, then the total electrical power consumed in the circuit will__.

Discussion

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

Discussion

22.	Question 12 Why does the Sun appear reddish early in the morning?
Answer» Question 12 Why does the Sun appear reddish early in the morning?

Discussion

23.	When does a machine act as (a) a force multiplier, (b) a speed multiplier? Can a machine act as a force multiplier and a speed multiplier simultaneously?
Answer» When does a machine act as (a) a force multiplier, (b) a speed multiplier? Can a machine act as a force multiplier and a speed multiplier simultaneously?

Discussion

24.	In the n-p-n transistor, why does base current always flow towards base?
Answer» In the n-p-n transistor, why does base current always flow towards base?

Discussion

25.	What is Left hand rule? Explain it with a diagram.
Answer» What is Left hand rule? Explain it with a diagram.

Discussion

26.	Question 148(i) Two machines can be hooked together. When something is sent through this hook up, the output from the first machine becomes the input for the second. Which two machines hooked together do the same work a (×102) machine does? Is there more than one arrangement of two machines that will work?
Answer» Question 148(i) Two machines can be hooked together. When something is sent through this hook up, the output from the first machine becomes the input for the second. Which two machines hooked together do the same work a $(\times 10^{2})$ machine does? Is there more than one arrangement of two machines that will work?

26.

Question 148(i) Two machines can be hooked together. When something is sent through this hook up, the output from the first machine becomes the input for the second. Which two machines hooked together do the same work a (×102) machine does? Is there more than one arrangement of two machines that will work?

Answer»

Question 148(i)

Two machines can be hooked together. When something is sent through this hook up, the output from the first machine becomes the input for the second.
Which two machines hooked together do the same work a $(\times 10^{2})$ machine does? Is there more than one arrangement of two machines that will work?

Discussion

27.	What is the weight of a block of mass 5 kg at the centre of the Earth? ( Take g = 10 msec2 )
Answer» What is the weight of a block of mass 5 kg at the centre of the Earth? ( Take g = 10 $\frac{m}{{s e c}^{2}}$ )

Discussion

28.	In a simple circuit containing a cell, an ammeter, aclosed key and a nichrome wire of length 'l', what changes (if any) would be observed in ammeter reading, if the nichrome wire is replaced by a silver wire of length 'l' and same thickness?
Answer» In a simple circuit containing a cell, an ammeter, aclosed key and a nichrome wire of length 'l', what changes (if any) would be observed in ammeter reading, if the nichrome wire is replaced by a silver wire of length 'l' and same thickness?

Discussion

29.	What are the advantages and disadvantages of parallel and series circuit?
Answer» What are the advantages and disadvantages of parallel and series circuit?

Discussion

30.	Which of the following is true about nature of light ?
Answer» Which of the following is true about nature of light ?

Discussion

31.	In the following question : if lens 1 has focal length 15 cm and lens 2 has focal length 30 cm find which one has more power ? the solution given says to find power we should write 1/15cm where as in the video sir says 1D = 1/m so please clarify if we have to convert the 15cm to meters first or not.
Answer» In the following question : if lens 1 has focal length 15 cm and lens 2 has focal length 30 cm find which one has more power ? the solution given says to find power we should write 1/15cm where as in the video sir says 1D = 1/m so please clarify if we have to convert the 15cm to meters first or not.

31.

In the following question : if lens 1 has focal length 15 cm and lens 2 has focal length 30 cm find which one has more power ? the solution given says to find power we should write 1/15cm where as in the video sir says 1D = 1/m so please clarify if we have to convert the 15cm to meters first or not.

Answer»

In the following question :

if lens 1 has focal length 15 cm and lens 2 has focal length 30 cm find which one has more power ?

the solution given says to find power we should write 1/15cm

where as in the video sir says 1D = 1/m

so please clarify if we have to convert the 15cm to meters first or not.

Discussion

32.	Define sustainable development.
Answer» Define sustainable development.

Discussion

33.	A current of 200 mA flows trhough a 4kΩ resistor. What is hte p.d. across the resistor?
Answer» A current of 200 mA flows trhough a $4 k Ω$ resistor. What is hte p.d. across the resistor?

Discussion

34.	Which one of the following represents correct formula for electrical energy?
Answer» Which one of the following represents correct formula for electrical energy?

Discussion

35.	The focal length of a biconvex lens is f. If we cut the lens into two equal pieces as shown in the figure, the focal length of each piece will be ___.
Answer» The focal length of a biconvex lens is $f$ . If we cut the lens into two equal pieces as shown in the figure, the focal length of each piece will be ___.

Discussion

36.	Why the force is maximum when a charged particle moves at right angles to the direction of magnetic field?
Answer» Why the force is maximum when a charged particle moves at right angles to the direction of magnetic field?

Discussion

37.	A compass needle placed just above a wire in which electrons are moving towards west, will point
Answer» A compass needle placed just above a wire in which electrons are moving towards west, will point

Discussion

38.	How do the molecules jiggle when an object is heated?
Answer» How do the molecules jiggle when an object is heated?

Discussion

39.	How mirrors are used in early days
Answer» How mirrors are used in early days

Discussion

40.	If an object is performing a uniform circular motion with a constant angular speed of 20 rad/s. Find the angular displacement in 2 sec.
Answer» If an object is performing a uniform circular motion with a constant angular speed of $20 r a d / s$ . Find the angular displacement in $2 s e c$ .

Discussion

41.	Question 6 On the basis of the issues raised in this chapter, what changes would you incorporate in your life-style in a move towards a sustainable use of our resources?
Answer» Question 6 On the basis of the issues raised in this chapter, what changes would you incorporate in your life-style in a move towards a sustainable use of our resources?

Discussion

42.	Name the two types of spherical mirrors. What type of mirror is represented by the : (a) back side of a shining steel spoon ? (b) front side of a shining steel spoon ?
Answer» Name the two types of spherical mirrors. What type of mirror is represented by the : (a) back side of a shining steel spoon ? (b) front side of a shining steel spoon ?

Discussion

43.	(a) Of what substance is the fuse wire made ? Why ? (b) Explain why, a copper wire cannot be used as a fuse wire.
Answer» (a) Of what substance is the fuse wire made ? Why ? (b) Explain why, a copper wire cannot be used as a fuse wire.

43.

(a) Of what substance is the fuse wire made ? Why ? (b) Explain why, a copper wire cannot be used as a fuse wire.

Answer»

(a) Of what substance is the fuse wire made ? Why ?

(b) Explain why, a copper wire cannot be used as a fuse wire.

Discussion

44.	A corkscrew is used to open a cork sealed- bottle. Which pair of forces among the following produces a maximum turning effect ?
Answer» A corkscrew is used to open a cork sealed- bottle. Which pair of forces among the following produces a maximum turning effect ?

Discussion

45.	What do you understand by stability of an atom?
Answer» What do you understand by stability of an atom?

Discussion

46.	Explain why the planet do not twinkle
Answer» Explain why the planet do not twinkle

Discussion

47.	A pin 3 cm long is placed at a distance of 24 cm from a convex lens of focal length 18 cm. The pin is placed perpendicular to the principal axis. Find the size of the image.
Answer» A pin 3 cm long is placed at a distance of 24 cm from a convex lens of focal length 18 cm. The pin is placed perpendicular to the principal axis. Find the size of the image.

Discussion

48.	How does cryogenics help in Magnetic Resonance Imaging (MRI)?
Answer» How does cryogenics help in Magnetic Resonance Imaging (MRI)?

Discussion

49.	A uniform meter scale of weight W is kept in equilibrium when supported at the 60 cm mark and a mass m of weight w is suspended at 90 cm mark as shown in the figure. Which of the following is true?
Answer» A uniform meter scale of weight $W$ is kept in equilibrium when supported at the $60 c m$ mark and a mass m of weight w is suspended at $90 c m$ mark as shown in the figure. Which of the following is true?

49.

A uniform meter scale of weight W is kept in equilibrium when supported at the 60 cm mark and a mass m of weight w is suspended at 90 cm mark as shown in the figure. Which of the following is true?

Answer»

A uniform meter scale of weight $W$ is kept in equilibrium when supported at the $60 c m$ mark and a mass m of weight w is suspended at $90 c m$ mark as shown in the figure. Which of the following is true?

Discussion

50.	Name the lens which can concentrate sun's rays to a point-and burn a hole in a piece of paper.
Answer» Name the lens which can concentrate sun's rays to a point-and burn a hole in a piece of paper.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A ray of light passes through the focus of the mirror. After reflection, it

A ray of light is incident on the pole of a concave mirror at an angle of 50o. At what angle will it reflect?

In the above circuit, a battery is connected with a coiled wire around a circular iron ring. On the other end, a galvanometer is connected in a similar way. In which of the below-mentioned condition will we see deflection in the galvanometer?

Fuse wire is connected in series with:

Among the given options which element is used in making solar cells?

The speed of light in glass, on increasing the wavelength of light in glass

(a) What do you understand by a simple machine ? (b) State the principle of an ideal machine.

Question 4 (b) How can you as an individual contribute or make a difference to the management of (b) water resources?

__ is the surrounding where an organism live.

What characteristic property of light is responsible for the blue colour of sky?

Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.

Three lenses A, B and C produce magnification of 1, 2 and 3 respectively. The net magnification of the combination is

AC current can be converted to DC current using __.

For what purpose are the transformers used? Can they be used with a direct current source?

A real image of half the object size is obtained in a concave spherical mirror with a radius of curvature of 40 cm. The distance of the object and that of its image from the mirror will be respectively:

In a full wave rectifier, the current in each diode flows for

Discuss the major hazards of nuclear power plants. [3 MARKS]

Statement 1: Tides are periodic rise and fall of the ocean's surface. Statement 2: Tides are caused by combined effects of the gravitational forces exerted by the Moon and the Sun. Choose the correct option.

In a series combination of electrical appliances, connected to a constant voltage power supply, if we add one more appliance with resistance R in series, then the total electrical power consumed in the circuit will__.

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

Question 12 Why does the Sun appear reddish early in the morning?

When does a machine act as (a) a force multiplier, (b) a speed multiplier? Can a machine act as a force multiplier and a speed multiplier simultaneously?

In the n-p-n transistor, why does base current always flow towards base?

What is Left hand rule? Explain it with a diagram.

What is the weight of a block of mass 5 kg at the centre of the Earth? ( Take g = 10 msec2 )

In a simple circuit containing a cell, an ammeter, aclosed key and a nichrome wire of length 'l', what changes (if any) would be observed in ammeter reading, if the nichrome wire is replaced by a silver wire of length 'l' and same thickness?

What are the advantages and disadvantages of parallel and series circuit?

Which of the following is true about nature of light ?

Define sustainable development.

A current of 200 mA flows trhough a 4kΩ resistor. What is hte p.d. across the resistor?

Which one of the following represents correct formula for electrical energy?

The focal length of a biconvex lens is f. If we cut the lens into two equal pieces as shown in the figure, the focal length of each piece will be ___.

Why the force is maximum when a charged particle moves at right angles to the direction of magnetic field?

A compass needle placed just above a wire in which electrons are moving towards west, will point

How do the molecules jiggle when an object is heated?

How mirrors are used in early days

If an object is performing a uniform circular motion with a constant angular speed of 20 rad/s. Find the angular displacement in 2 sec.

Question 6 On the basis of the issues raised in this chapter, what changes would you incorporate in your life-style in a move towards a sustainable use of our resources?

Name the two types of spherical mirrors. What type of mirror is represented by the : (a) back side of a shining steel spoon ? (b) front side of a shining steel spoon ?

(a) Of what substance is the fuse wire made ? Why ? (b) Explain why, a copper wire cannot be used as a fuse wire.

A corkscrew is used to open a cork sealed- bottle. Which pair of forces among the following produces a maximum turning effect ?

What do you understand by stability of an atom?

Explain why the planet do not twinkle

A pin 3 cm long is placed at a distance of 24 cm from a convex lens of focal length 18 cm. The pin is placed perpendicular to the principal axis. Find the size of the image.

How does cryogenics help in Magnetic Resonance Imaging (MRI)?

A uniform meter scale of weight W is kept in equilibrium when supported at the 60 cm mark and a mass m of weight w is suspended at 90 cm mark as shown in the figure. Which of the following is true?

Name the lens which can concentrate sun's rays to a point-and burn a hole in a piece of paper.