16569 + Interview Questions in Physics

1.	A beam of light incident on a thin concave lens parallel to its principle axis diverges and appears to come from a point F on the principal axis. Name the point F. Draw a ray diagram to show it.
Answer» A beam of light incident on a thin concave lens parallel to its principle axis diverges and appears to come from a point F on the principal axis. Name the point F. Draw a ray diagram to show it.

Discussion

2.	If a driver has one convex and one plane rear-view mirror, how would the images in each mirror appear different ?
Answer» If a driver has one convex and one plane rear-view mirror, how would the images in each mirror appear different ?

Discussion

3.	India detonated her first underground nuclear weapon at ______.
Answer» India detonated her first underground nuclear weapon at ______.

Discussion

4.	State whether the following statements are true of false : (a) A generator works on the principle of electromagnetic induction. (b) A motor works on the principle of electromagnetic induction.
Answer» State whether the following statements are true of false : (a) A generator works on the principle of electromagnetic induction. (b) A motor works on the principle of electromagnetic induction.

4.

State whether the following statements are true of false : (a) A generator works on the principle of electromagnetic induction. (b) A motor works on the principle of electromagnetic induction.

Answer»

State whether the following statements are true of false :

(a) A generator works on the principle of electromagnetic induction.

(b) A motor works on the principle of electromagnetic induction.

Discussion

5.	How much work is done when one coulomb charge moves against a potential difference of 1 volt?
Answer» How much work is done when one coulomb charge moves against a potential difference of 1 volt?

Discussion

6.	An image is seen by a lens two times on a screen. Name the lens and its nature.
Answer» An image is seen by a lens two times on a screen. Name the lens and its nature.

Discussion

7.	Which of the following can undergo nuclear fusion reaction ? (a) uranium (b) deuterium (c) barium (d) krypton
Answer» Which of the following can undergo nuclear fusion reaction ? (a) uranium (b) deuterium (c) barium (d) krypton

7.

Which of the following can undergo nuclear fusion reaction ? (a) uranium (b) deuterium (c) barium (d) krypton

Answer»

Which of the following can undergo nuclear fusion reaction ?

(a) uranium (b) deuterium (c) barium (d) krypton

Discussion

8.	A bullet of mass ‘m', moving with a speed ‘v’ strikes a wooden block of mass M and gets embedded in it. The speed of this embedded block will be?
Answer» A bullet of mass ‘m', moving with a speed ‘v’ strikes a wooden block of mass M and gets embedded in it. The speed of this embedded block will be?

Discussion

9.	What happens to RI of a material when temperature increases?
Answer» What happens to RI of a material when temperature increases?

Discussion

10.	Question 1 Define the principal focus of a concave mirror.
Answer» Question 1 Define the principal focus of a concave mirror.

Discussion

11.	A coil ABCD mounted on an axle is placed between the poles N and S of a permanent magnet as shown in Fig. (a) In which direction will the coil begin to rotate when current is passed through the coil in direction ABCD by connecting a battery at the ends A and D of the coil? (b) Why is a commutator necessary for continuous rotation of the coil? (c) Complete the diagram with commutator, ets. For the flow of current in the coil?
Answer» A coil ABCD mounted on an axle is placed between the poles N and S of a permanent magnet as shown in Fig. (a) In which direction will the coil begin to rotate when current is passed through the coil in direction ABCD by connecting a battery at the ends A and D of the coil? (b) Why is a commutator necessary for continuous rotation of the coil? (c) Complete the diagram with commutator, ets. For the flow of current in the coil?

11.

A coil ABCD mounted on an axle is placed between the poles N and S of a permanent magnet as shown in Fig. (a) In which direction will the coil begin to rotate when current is passed through the coil in direction ABCD by connecting a battery at the ends A and D of the coil? (b) Why is a commutator necessary for continuous rotation of the coil? (c) Complete the diagram with commutator, ets. For the flow of current in the coil?

Answer»

A coil ABCD mounted on an axle is placed between the poles N and S of a permanent magnet as shown in Fig.

(a) In which direction will the coil begin to rotate when current is passed through the coil in direction ABCD by connecting a battery at the ends A and D of the coil?

(b) Why is a commutator necessary for continuous rotation of the coil?

(c) Complete the diagram with commutator, ets. For the flow of current in the coil?

Discussion

12.	State two factors on which the magnitude of an induced e.m.f. in the secondary coil of a transformer depends.
Answer» State two factors on which the magnitude of an induced e.m.f. in the secondary coil of a transformer depends.

Discussion

13.	Danger signals use ___colored light.
Answer» Danger signals use ___colored light.

Discussion

14.	A rocket is launched vertically from the surface of the earth of radius R with an initial speed v. If atmospheric resistance is neglected, the maximum height attained by the rocket is given by
Answer» A rocket is launched vertically from the surface of the earth of radius R with an initial speed v. If atmospheric resistance is neglected, the maximum height attained by the rocket is given by

Discussion

15.	A transmission wire carries a current of 100 A. What would be the magnetic field B at a point on the road if the wire is 8 m above the road ?
Answer» A transmission wire carries a current of 100 A. What would be the magnetic field B at a point on the road if the wire is 8 m above the road ?

Discussion

16.	Which of the above optical system are lens?
Answer» Which of the above optical system are lens?

16.

Which of the above optical system are lens?

Answer»

Which of the above optical system are lens?

Discussion

17.	Consider the same Carnot engine that operates between the temperatures TH 850 K and TL300 K. The engine performs 1200 J of work each cycle, which takes 0.25 s. What is the average power of this engine?
Answer» Consider the same Carnot engine that operates between the temperatures $T_{H}$ 850 K and $T_{L}$ 300 K. The engine performs 1200 J of work each cycle, which takes 0.25 s. What is the average power of this engine?

Discussion

18.	Which of the following is true for a step up transformer?
Answer» Which of the following is true for a step up transformer?

Discussion

19.	(a) The ray diagram given below illustrates the experimental set-up for the determination of the focal length of a converging lens using a plane mirror. (i) Write two characteristics of the image Formed. (ii) What is the name given to the distance between the object and optical centre of the lens in the above diagram? (b) The given figure shows an object O as its image I. Copy the diagram and draw suitable rays to locate the lens and focus. Name the type of lens in this cases [5 MARKS]
Answer» (a) The ray diagram given below illustrates the experimental set-up for the determination of the focal length of a converging lens using a plane mirror. (i) Write two characteristics of the image Formed. (ii) What is the name given to the distance between the object and optical centre of the lens in the above diagram? (b) The given figure shows an object O as its image I. Copy the diagram and draw suitable rays to locate the lens and focus. Name the type of lens in this cases [5 MARKS]

Discussion

20.	Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings The deflection in the compass needle decreases as the compass is moved away from the copper wire. This tells that:
Answer» Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings The deflection in the compass needle decreases as the compass is moved away from the copper wire. This tells that:

20.

Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings The deflection in the compass needle decreases as the compass is moved away from the copper wire. This tells that:

Answer»

Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings

The deflection in the compass needle decreases as the compass is moved away from the copper wire. This tells that:

Discussion

21.	Which phenomenon makes us see the sun : (a) a few minutes before actual sunrise ? (b) a few minutes after actual sunset ?
Answer» Which phenomenon makes us see the sun : (a) a few minutes before actual sunrise ? (b) a few minutes after actual sunset ?

Discussion

22.	What may happen if- 1. a glass rod is rubbed with fur 2. a glass rod is rubbed with silk cloth 3. an ebonite rod is rubbed with fur 4. an ebonite rod is rubbed with silk cloth
Answer» What may happen if- 1. a glass rod is rubbed with fur 2. a glass rod is rubbed with silk cloth 3. an ebonite rod is rubbed with fur 4. an ebonite rod is rubbed with silk cloth

Discussion

23.	The capacity to bring about coagulation increases with
Answer» The capacity to bring about coagulation increases with

Discussion

24.	What actually travels through the wires when you switch on a light?
Answer» What actually travels through the wires when you switch on a light?

Discussion

25.	A coin is placed in a tumbler, water is then filled in the tumbler to a height of 20 cm. If the refractive index of water is 4/3, calculate the apparent depth of the coin. [2 MARKS]
Answer» A coin is placed in a tumbler, water is then filled in the tumbler to a height of 20 cm. If the refractive index of water is 4/3, calculate the apparent depth of the coin. [2 MARKS]

Discussion

26.	If the charge on an electron be 1.6×10−19 C, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current.
Answer» If the charge on an electron be $1.6 \times 10^{- 19} C$ , how many electrons should pass through a conductor in 1 second to constitute 1 ampere current.

Discussion

27.	Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be [IIT-JEE 1989]
Answer» Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be [IIT-JEE 1989]

27.

Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be [IIT-JEE 1989]

Answer»

Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be [IIT-JEE 1989]

Discussion

28.	How does (a) resistance, and (b) specific resistance of a wire depend on its (i) length, and (ii) radius?
Answer» How does (a) resistance, and (b) specific resistance of a wire depend on its (i) length, and (ii) radius?

Discussion

29.	The maximum number of electrons that can be accommodated in the L orbit is ___
Answer» The maximum number of electrons that can be accommodated in the $L$ orbit is ___

Discussion

30.	___coloured light has the largest wavelength in the visible spectrum.
Answer» ___coloured light has the largest wavelength in the visible spectrum.

Discussion

31.	A battery of 9 V is connected in series with resistors of 0.2W, 0.3W, 0.4W, 0.5W and 12W. How much current would flow through the 12W resistor? (Give the answer in A to 2 decimal places)
Answer» A battery of 9 V is connected in series with resistors of 0.2W, 0.3W, 0.4W, 0.5W and 12W. How much current would flow through the 12W resistor? (Give the answer in A to 2 decimal places)

Discussion

32.	Working of a pressure cooker is based on the principle that boiling point of water increases with the _______.
Answer» Working of a pressure cooker is based on the principle that boiling point of water increases with the _______.

Discussion

33.	In which direction does the magnetic field lines run inside a bar magnet?
Answer» In which direction does the magnetic field lines run inside a bar magnet?

Discussion

34.	Four wires each of same length, diameter and material are connected to each other to form a square. If the resistance of each wire is R, then equivalent resistance across the opposite corners is:
Answer» Four wires each of same length, diameter and material are connected to each other to form a square. If the resistance of each wire is R, then equivalent resistance across the opposite corners is:

Discussion

35.	A gas initially at 0∘C is heated so that its pressure and volume are both doubled. What will be its final temperature?
Answer» A gas initially at $0^{\circ} C$ is heated so that its pressure and volume are both doubled. What will be its final temperature?

Discussion

36.	which of device no plus or minus is indicated
Answer» which of device no plus or minus is indicated

Discussion

37.	What are the various forms of water?
Answer» What are the various forms of water?

Discussion

38.	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

39.	Why do different rays in electromagnetic spectrum differ in heating abilities ?
Answer» Why do different rays in electromagnetic spectrum differ in heating abilities ?

Discussion

40.	Plutonium undergoes α-decay to form uranium: 23994Pu → 23592U + 42He The atomic masses of the elements are as follows: Calculate the kinetic energy imparted to the daughter nuclei due to the mass defect.
Answer» Plutonium undergoes $α$ -decay to form uranium: $23994 Pu \to 23592 U + 42 He$ The atomic masses of the elements are as follows: Calculate the kinetic energy imparted to the daughter nuclei due to the mass defect.

Discussion

41.	When is the force experienced by a current carrying conductor placed in a magnetic field largest and how? Explain.
Answer» When is the force experienced by a current carrying conductor placed in a magnetic field largest and how? Explain.

Discussion

42.	Why are danger signals always red in colour ?
Answer» Why are danger signals always red in colour ?

Discussion

43.	___ is the application of controlled amounts of water to plants at needed intervals.
Answer» ___ is the application of controlled amounts of water to plants at needed intervals.

Discussion

44.	When light rays from stars enter into earth's atmosphere, it travels from
Answer» When light rays from stars enter into earth's atmosphere, it travels from

Discussion

45.	How is Avogadro's hypothesis used to deduce atomicity of elementary gases?
Answer» How is Avogadro's hypothesis used to deduce atomicity of elementary gases?

Discussion

46.	Among the three kinds of nuclear radiations, _________ rays are most harmful, since they have the greatest penetrating power.
Answer» Among the three kinds of nuclear radiations, _________ rays are most harmful, since they have the greatest penetrating power.

Discussion

47.	An electric fuse works on the: (a) chemical effect fo current (b) magnetic effect fo current (c) lighting effect of current (d) heating effect fo current
Answer» An electric fuse works on the: (a) chemical effect fo current (b) magnetic effect fo current (c) lighting effect of current (d) heating effect fo current

Discussion

48.	Ohm’s Law gives the relation between ?
Answer» Ohm’s Law gives the relation between ?

Discussion

49.	What is Maxwell's corkscrew rule ? For what purpose is its used ?
Answer» What is Maxwell's corkscrew rule ? For what purpose is its used ?

Discussion

50.	Can potential energy change into kinetic energy only? (directly )
Answer» Can potential energy change into kinetic energy only? (directly )

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A beam of light incident on a thin concave lens parallel to its principle axis diverges and appears to come from a point F on the principal axis. Name the point F. Draw a ray diagram to show it.

If a driver has one convex and one plane rear-view mirror, how would the images in each mirror appear different ?

India detonated her first underground nuclear weapon at ______.

State whether the following statements are true of false : (a) A generator works on the principle of electromagnetic induction. (b) A motor works on the principle of electromagnetic induction.

How much work is done when one coulomb charge moves against a potential difference of 1 volt?

An image is seen by a lens two times on a screen. Name the lens and its nature.

Which of the following can undergo nuclear fusion reaction ? (a) uranium (b) deuterium (c) barium (d) krypton

A bullet of mass ‘m', moving with a speed ‘v’ strikes a wooden block of mass M and gets embedded in it. The speed of this embedded block will be?

What happens to RI of a material when temperature increases?

Question 1 Define the principal focus of a concave mirror.

State two factors on which the magnitude of an induced e.m.f. in the secondary coil of a transformer depends.

Danger signals use ___colored light.

A rocket is launched vertically from the surface of the earth of radius R with an initial speed v. If atmospheric resistance is neglected, the maximum height attained by the rocket is given by

A transmission wire carries a current of 100 A. What would be the magnetic field B at a point on the road if the wire is 8 m above the road ?

Which of the above optical system are lens?

Consider the same Carnot engine that operates between the temperatures TH 850 K and TL300 K. The engine performs 1200 J of work each cycle, which takes 0.25 s. What is the average power of this engine?

Which of the following is true for a step up transformer?

Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings The deflection in the compass needle decreases as the compass is moved away from the copper wire. This tells that:

Which phenomenon makes us see the sun : (a) a few minutes before actual sunrise ? (b) a few minutes after actual sunset ?

What may happen if- 1. a glass rod is rubbed with fur 2. a glass rod is rubbed with silk cloth 3. an ebonite rod is rubbed with fur 4. an ebonite rod is rubbed with silk cloth

The capacity to bring about coagulation increases with

What actually travels through the wires when you switch on a light?

A coin is placed in a tumbler, water is then filled in the tumbler to a height of 20 cm. If the refractive index of water is 4/3, calculate the apparent depth of the coin. [2 MARKS]

If the charge on an electron be 1.6×10−19 C, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current.

Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be [IIT-JEE 1989]

How does (a) resistance, and (b) specific resistance of a wire depend on its (i) length, and (ii) radius?

The maximum number of electrons that can be accommodated in the L orbit is ___

___coloured light has the largest wavelength in the visible spectrum.

A battery of 9 V is connected in series with resistors of 0.2W, 0.3W, 0.4W, 0.5W and 12W. How much current would flow through the 12W resistor? (Give the answer in A to 2 decimal places)

Working of a pressure cooker is based on the principle that boiling point of water increases with the _______.

In which direction does the magnetic field lines run inside a bar magnet?

Four wires each of same length, diameter and material are connected to each other to form a square. If the resistance of each wire is R, then equivalent resistance across the opposite corners is:

A gas initially at 0∘C is heated so that its pressure and volume are both doubled. What will be its final temperature?

which of device no plus or minus is indicated

What are the various forms of water?

Why does a magnetic bar hung from a string always comes to rest in North-South direction?

Why do different rays in electromagnetic spectrum differ in heating abilities ?

Plutonium undergoes α-decay to form uranium: 23994Pu → 23592U + 42He The atomic masses of the elements are as follows: Calculate the kinetic energy imparted to the daughter nuclei due to the mass defect.

When is the force experienced by a current carrying conductor placed in a magnetic field largest and how? Explain.

Why are danger signals always red in colour ?

___ is the application of controlled amounts of water to plants at needed intervals.

When light rays from stars enter into earth's atmosphere, it travels from

How is Avogadro's hypothesis used to deduce atomicity of elementary gases?

Among the three kinds of nuclear radiations, _________ rays are most harmful, since they have the greatest penetrating power.

An electric fuse works on the: (a) chemical effect fo current (b) magnetic effect fo current (c) lighting effect of current (d) heating effect fo current

Ohm’s Law gives the relation between ?

What is Maxwell's corkscrew rule ? For what purpose is its used ?

Can potential energy change into kinetic energy only? (directly )