16569 + Interview Questions in Physics

1.	A machine has a velocity ratio of 4. If it is used to raise a load of 400 N by 4 m using an effort of 200 N, find the work done on the machine. Take g = 10 m/s2.
Answer» A machine has a velocity ratio of 4. If it is used to raise a load of 400 N by 4 m using an effort of 200 N, find the work done on the machine. Take g = 10 m/s $^{2}$ .

Discussion

2.	Discuss the effects of mining on our environment.
Answer» Discuss the effects of mining on our environment.

Discussion

3.	The refractive index of water with respect to air is 43 . What is the refractive index of air with respect to water?
Answer» The refractive index of water with respect to air is $\frac{4}{3}$ . What is the refractive index of air with respect to water?

Discussion

4.	What is the difference between AC AND DC current?
Answer» What is the difference between AC AND DC current?

Discussion

5.	A constant torque acting on a uniform circular wheel changes its angular momentum from A0 to 4 A0 in 4 seconds, the magnitude of the torque is
Answer» A constant torque acting on a uniform circular wheel changes its angular momentum from $A_{0}$ to 4 $A_{0}$ in 4 seconds, the magnitude of the torque is

Discussion

6.	Name any instrument that uses the principal of centrifugal force
Answer» Name any instrument that uses the principal of centrifugal force

Discussion

7.	Choose the correct statement:
Answer» Choose the correct statement:

Discussion

8.	State one advantage of using a total reflecting prism as a reflector in place of a plane mirror.
Answer» State one advantage of using a total reflecting prism as a reflector in place of a plane mirror.

Discussion

9.	the characteristic that will remain unaltered as light moves from one medium to another is ? 1. Velocity 2. Wave length 3. Frequency 4. None of these
Answer» the characteristic that will remain unaltered as light moves from one medium to another is ? 1. Velocity 2. Wave length 3. Frequency 4. None of these

Discussion

10.	Ashlyn said to her grandmother "Today's climate is good”. Is this statement correct or not? [3 MARKS]
Answer» Ashlyn said to her grandmother "Today's climate is good”. Is this statement correct or not? [3 MARKS]

Discussion

11.	Name the scientist who discovered the magnetic effect of current.
Answer» Name the scientist who discovered the magnetic effect of current.

Discussion

12.	Which class of a lever is always a force multiplier? Give example.
Answer» Which class of a lever is always a force multiplier? Give example.

Discussion

13.	How does the power of a lens change if its focal length is doubled ?
Answer» How does the power of a lens change if its focal length is doubled ?

Discussion

14.	The least doped region in a transistor is the _____.
Answer» The least doped region in a transistor is the _____.

Discussion

15.	The gravitational pull of the moon causes the sea-water to rise periodically. (a) What name is given to the condition of the sea when its water is raised ? (b) What name is given to the condition of the sea when its raised water recedes ? (c) What name is given to the energy which can be harnessed from this natural phenomenon ? (d) Draw labelled diagram to show how this energy can be harnessed to generate electricity.
Answer» The gravitational pull of the moon causes the sea-water to rise periodically. (a) What name is given to the condition of the sea when its water is raised ? (b) What name is given to the condition of the sea when its raised water recedes ? (c) What name is given to the energy which can be harnessed from this natural phenomenon ? (d) Draw labelled diagram to show how this energy can be harnessed to generate electricity.

Discussion

16.	(a) A current-carrying conductor is placed perpendicularly in a magnetic field. Name the rule which can be used to find the direction of force acting on the conductor. (b) State two ways to increase the force on a current-carrying conductor in a magnetic field. (c) Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field.
Answer» (a) A current-carrying conductor is placed perpendicularly in a magnetic field. Name the rule which can be used to find the direction of force acting on the conductor. (b) State two ways to increase the force on a current-carrying conductor in a magnetic field. (c) Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field.

16.

(a) A current-carrying conductor is placed perpendicularly in a magnetic field. Name the rule which can be used to find the direction of force acting on the conductor. (b) State two ways to increase the force on a current-carrying conductor in a magnetic field. (c) Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field.

Answer»

(a) A current-carrying conductor is placed perpendicularly in a magnetic field. Name the rule which can be used to find the direction of force acting on the conductor.

(b) State two ways to increase the force on a current-carrying conductor in a magnetic field.

(c) Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field.

Discussion

17.	Relaxation of the ciliary muscles causes the focal length of eye lens to:
Answer» Relaxation of the ciliary muscles causes the focal length of eye lens to:

Discussion

18.	What is the part of an electric circuit used to limit the amount of electric current flowing through it?
Answer» What is the part of an electric circuit used to limit the amount of electric current flowing through it?

Discussion

19.	Statement 1: Dynamo is used to generate electricity in thermal power plant, a hydropower plant and wind energy plant. Statement 2: Dynamo converts mechanical energy from turbine to electrical energy.
Answer» Statement 1: Dynamo is used to generate electricity in thermal power plant, a hydropower plant and wind energy plant. Statement 2: Dynamo converts mechanical energy from turbine to electrical energy.

19.

Statement 1: Dynamo is used to generate electricity in thermal power plant, a hydropower plant and wind energy plant. Statement 2: Dynamo converts mechanical energy from turbine to electrical energy.

Answer»

Statement 1: Dynamo is used to generate electricity in thermal power plant, a hydropower plant and wind energy plant.

Statement 2: Dynamo converts mechanical energy from turbine to electrical energy.

Discussion

20.	The___of the body is the average internal kinetic energy of molecules of a substance.
Answer» The___of the body is the average internal kinetic energy of molecules of a substance.

Discussion

21.	Which of the following plots represent the Charles' law for an ideal gas?
Answer» Which of the following plots represent the Charles' law for an ideal gas?

Discussion

22.	A copper disc of radius 0.1 m rotates about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 Tesla. The emf induced across the radius of the disc is
Answer» A copper disc of radius 0.1 m rotates about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 Tesla. The emf induced across the radius of the disc is

Discussion

23.	When a current carrying conductor is held in a way that the thumb faces the direction of the current, the direction of the curl of fingers corresponds:
Answer» When a current carrying conductor is held in a way that the thumb faces the direction of the current, the direction of the curl of fingers corresponds:

Discussion

24.	If f is focal length of the lens, then the power of a lens is equal to
Answer» If $f$ is focal length of the lens, then the power of a lens is equal to

Discussion

25.	What is the way to detect the polarity of a current carrying solenoid?
Answer» What is the way to detect the polarity of a current carrying solenoid?

Discussion

26.	Draw a displacement-distance graph for two waves A and B such that the amplitude of wave A is three times that of wave B.
Answer» Draw a displacement-distance graph for two waves A and B such that the amplitude of wave A is three times that of wave B.

Discussion

27.	A cell of e.m.f. 2 V and internal resistance 1.2 Ω is connected to an ammeter of resistance 0.8 Ω and two resistors of 4.5 Ω and 9 Ω as shown in the figure. Find: (a) the reading of the ammeter, (b) the potential difference across the terminals of the cell, and (c) the potential difference across the 4.5 Ω resistor.
Answer» A cell of e.m.f. 2 V and internal resistance $1.2 Ω$ is connected to an ammeter of resistance $0.8 Ω$ and two resistors of $4.5 Ω$ and $9 Ω$ as shown in the figure. Find: (a) the reading of the ammeter, (b) the potential difference across the terminals of the cell, and (c) the potential difference across the $4.5 Ω$ resistor.

Discussion

28.	Why is the earth pin thicker and longer than the live and the neutral pins? What is the advantage of earth wire connection in domestic appliances? [3 MARKS]
Answer» Why is the earth pin thicker and longer than the live and the neutral pins? What is the advantage of earth wire connection in domestic appliances? [3 MARKS]

Discussion

29.	The correct expression for heat produced (H) in an electric circuit is:
Answer» The correct expression for heat produced (H) in an electric circuit is:

Discussion

30.	Why change in magnetic flux produces a current?
Answer» Why change in magnetic flux produces a current?

Discussion

31.	If we connect two poles of electric current (+ ve and -ve) then there will be a short circuit, then when bulb glows, the filament is of tungsten which is metal, then why there will not a short circuit takes place?
Answer» If we connect two poles of electric current (+ ve and -ve) then there will be a short circuit, then when bulb glows, the filament is of tungsten which is metal, then why there will not a short circuit takes place?

Discussion

32.	Which of the following ions, has polarizing power close to that of Mg2+
Answer» Which of the following ions, has polarizing power close to that of Mg2+

Discussion

33.	An electric bulb is connected to a 220V generator , the current is 0.50A . calculate the power of the bulb
Answer» An electric bulb is connected to a 220V generator , the current is 0.50A . calculate the power of the bulb

Discussion

34.	Conditions on earth that led to the origin of life
Answer» Conditions on earth that led to the origin of life

Discussion

35.	For the given figure, where does the center of mass lie?
Answer» For the given figure, where does the center of mass lie?

35.

For the given figure, where does the center of mass lie?

Answer»

For the given figure, where does the center of mass lie?

Discussion

36.	What is nuclear fusion?what are its advantages.give any five points.
Answer» What is nuclear fusion?what are its advantages.give any five points.

Discussion

37.	In the given diagram of a DC motor, the direction of flow of electrons in the left arm is?
Answer» In the given diagram of a DC motor, the direction of flow of electrons in the left arm is?

Discussion

38.	A boy standing on a bus is thrown towards the rear of the bus as it begins to move and to the front of it as it slows down. Why does this happen?
Answer» A boy standing on a bus is thrown towards the rear of the bus as it begins to move and to the front of it as it slows down. Why does this happen?

Discussion

39.	Why does light appear to travel in a straight line?
Answer» Why does light appear to travel in a straight line?

Discussion

40.	1. Write the formula for resistance of a wire of length L and cross-section A. 2. A piece of wire is redrawn by pulling it until its length is doubled. Compare the new resistance with the original value. 3. How many 176Ω resistors (in parallel) are required to carry 5 A in 220 V line? [5 MARKS]
Answer» 1. Write the formula for resistance of a wire of length L and cross-section A. 2. A piece of wire is redrawn by pulling it until its length is doubled. Compare the new resistance with the original value. 3. How many 176 $Ω$ resistors (in parallel) are required to carry 5 A in 220 V line? [5 MARKS]

Discussion

41.	'n' numbers of resistors each of resistance 'R' are first connected in series and then in parallel. What would be the ratio of the equivalent resistance(RsRp) of the two cases?
Answer» 'n' numbers of resistors each of resistance 'R' are first connected in series and then in parallel. What would be the ratio of the equivalent resistance $(\frac{R_{s}}{R_{p}})$ of the two cases?

Discussion

42.	why can not we use DC current instead of using AC current after it reaches our home appliances using diode
Answer» why can not we use DC current instead of using AC current after it reaches our home appliances using diode

Discussion

43.	What is the difference between potential difference and electric potential?
Answer» What is the difference between potential difference and electric potential?

Discussion

44.	What are the characteristics same for both waves given in the fig (1) and fig (2).
Answer» What are the characteristics same for both waves given in the fig (1) and fig (2).

44.

What are the characteristics same for both waves given in the fig (1) and fig (2).

Answer»

What are the characteristics same for both waves given in the fig (1) and fig (2).

Discussion

45.	Give the sign convention in concave and convex mirrors.
Answer» Give the sign convention in concave and convex mirrors.

Discussion

46.	4 wires each of Same diameter and material connected to each other to form a square if the resistance of each wires is R then the equivalent resistance across the opposite corner is?
Answer» 4 wires each of Same diameter and material connected to each other to form a square if the resistance of each wires is R then the equivalent resistance across the opposite corner is?

Discussion

47.	Escape speed from the surface of a planet is v. Now a tunnel is dug across the diameter of the planet and a ball is projected from the center of the planet. What would be the escape speed from the center of the planet (planet ⇒ solid sphere) ?
Answer» Escape speed from the surface of a planet is $v$ . Now a tunnel is dug across the diameter of the planet and a ball is projected from the center of the planet. What would be the escape speed from the center of the planet (planet $\Rightarrow$ solid sphere) ?

Discussion

48.	In lenses chapter,(i.e.lens law) When do you take object distance as negative
Answer» In lenses chapter,(i.e.lens law) When do you take object distance as negative

48.

In lenses chapter,(i.e.lens law) When do you take object distance as negative

Answer»

In lenses chapter,(i.e.lens law)

When do you take object distance as negative

Discussion

49.	The ways by which the magnetic field of a solenoid can be made stronger are:
Answer» The ways by which the magnetic field of a solenoid can be made stronger are:

Discussion

50.	Metallic ions are discharged at the __(anode/ cathode) during electrolysis.
Answer» Metallic ions are discharged at the __(anode/ cathode) during electrolysis.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A machine has a velocity ratio of 4. If it is used to raise a load of 400 N by 4 m using an effort of 200 N, find the work done on the machine. Take g = 10 m/s2.

Discuss the effects of mining on our environment.

The refractive index of water with respect to air is 43 . What is the refractive index of air with respect to water?

What is the difference between AC AND DC current?

A constant torque acting on a uniform circular wheel changes its angular momentum from A0 to 4 A0 in 4 seconds, the magnitude of the torque is

Name any instrument that uses the principal of centrifugal force

Choose the correct statement:

State one advantage of using a total reflecting prism as a reflector in place of a plane mirror.

the characteristic that will remain unaltered as light moves from one medium to another is ? 1. Velocity 2. Wave length 3. Frequency 4. None of these

Ashlyn said to her grandmother "Today's climate is good”. Is this statement correct or not? [3 MARKS]

Name the scientist who discovered the magnetic effect of current.

Which class of a lever is always a force multiplier? Give example.

How does the power of a lens change if its focal length is doubled ?

The least doped region in a transistor is the _____.

Relaxation of the ciliary muscles causes the focal length of eye lens to:

What is the part of an electric circuit used to limit the amount of electric current flowing through it?

Statement 1: Dynamo is used to generate electricity in thermal power plant, a hydropower plant and wind energy plant. Statement 2: Dynamo converts mechanical energy from turbine to electrical energy.

The___of the body is the average internal kinetic energy of molecules of a substance.

Which of the following plots represent the Charles' law for an ideal gas?

A copper disc of radius 0.1 m rotates about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 Tesla. The emf induced across the radius of the disc is

When a current carrying conductor is held in a way that the thumb faces the direction of the current, the direction of the curl of fingers corresponds:

If f is focal length of the lens, then the power of a lens is equal to

What is the way to detect the polarity of a current carrying solenoid?

Draw a displacement-distance graph for two waves A and B such that the amplitude of wave A is three times that of wave B.

Why is the earth pin thicker and longer than the live and the neutral pins? What is the advantage of earth wire connection in domestic appliances? [3 MARKS]

The correct expression for heat produced (H) in an electric circuit is:

Why change in magnetic flux produces a current?

If we connect two poles of electric current (+ ve and -ve) then there will be a short circuit, then when bulb glows, the filament is of tungsten which is metal, then why there will not a short circuit takes place?

Which of the following ions, has polarizing power close to that of Mg2+

An electric bulb is connected to a 220V generator , the current is 0.50A . calculate the power of the bulb

Conditions on earth that led to the origin of life

For the given figure, where does the center of mass lie?

What is nuclear fusion?what are its advantages.give any five points.

In the given diagram of a DC motor, the direction of flow of electrons in the left arm is?

A boy standing on a bus is thrown towards the rear of the bus as it begins to move and to the front of it as it slows down. Why does this happen?

Why does light appear to travel in a straight line?

1. Write the formula for resistance of a wire of length L and cross-section A. 2. A piece of wire is redrawn by pulling it until its length is doubled. Compare the new resistance with the original value. 3. How many 176Ω resistors (in parallel) are required to carry 5 A in 220 V line? [5 MARKS]

'n' numbers of resistors each of resistance 'R' are first connected in series and then in parallel. What would be the ratio of the equivalent resistance(RsRp) of the two cases?

why can not we use DC current instead of using AC current after it reaches our home appliances using diode

What is the difference between potential difference and electric potential?

What are the characteristics same for both waves given in the fig (1) and fig (2).

Give the sign convention in concave and convex mirrors.

4 wires each of Same diameter and material connected to each other to form a square if the resistance of each wires is R then the equivalent resistance across the opposite corner is?

Escape speed from the surface of a planet is v. Now a tunnel is dug across the diameter of the planet and a ball is projected from the center of the planet. What would be the escape speed from the center of the planet (planet ⇒ solid sphere) ?

In lenses chapter,(i.e.lens law) When do you take object distance as negative

The ways by which the magnetic field of a solenoid can be made stronger are:

Metallic ions are discharged at the __(anode/ cathode) during electrolysis.