16569 + Interview Questions in Physics

1.	A dentist uses a concave mirror of radius of curvature 3 cm and places an object at a distance of x cm from the mirror to get a magnification of +5 .Find x
Answer» A dentist uses a concave mirror of radius of curvature 3 cm and places an object at a distance of x cm from the mirror to get a magnification of +5 .Find x

Discussion

2.	Which part of the mirror reflects the light?
Answer» Which part of the mirror reflects the light?

Discussion

3.	Why is reabsorption of urea don't take place ?
Answer» Why is reabsorption of urea don't take place ?

Discussion

4.	Why does a fuse have high resistance whereas low resistivity?
Answer» Why does a fuse have high resistance whereas low resistivity?

Discussion

5.	An image 2/3 of size of the object is formed by a convex lens at a distance of 12cm from it. Find the focal length of the lens
Answer» An image 2/3 of size of the object is formed by a convex lens at a distance of 12cm from it. Find the focal length of the lens

Discussion

6.	The r.m.s speed of oxygen at NTP is x m/s. If the gas is heated at constant pressure till its volume is four fold, what will be its final temperature and r.m.s speed?
Answer» The r.m.s speed of oxygen at NTP is x m/s. If the gas is heated at constant pressure till its volume is four fold, what will be its final temperature and r.m.s speed?

Discussion

7.	A person has near point of his vision shifted to 50 cm. What lens must be used to see an object placed at 25 cm from the eye? What is the power of the lens?
Answer» A person has near point of his vision shifted to 50 cm. What lens must be used to see an object placed at 25 cm from the eye? What is the power of the lens?

Discussion

8.	A student has to connect 4 cells of 1.5 V each, to form a battery of voltage 6 V. The correct way of connecting these cells is shown in figure.
Answer» A student has to connect 4 cells of 1.5 V each, to form a battery of voltage 6 V. The correct way of connecting these cells is shown in figure.

8.

A student has to connect 4 cells of 1.5 V each, to form a battery of voltage 6 V. The correct way of connecting these cells is shown in figure.

Answer»

A student has to connect 4 cells of 1.5 V each, to form a battery of voltage 6 V. The correct way of connecting these cells is shown in figure.

Discussion

9.	A student obtained a blurred image of an illuminated distant tower on a screen by using a convex lens In order to obtain sharp image of the tower on the screen, he must shift the lens:
Answer» A student obtained a blurred image of an illuminated distant tower on a screen by using a convex lens In order to obtain sharp image of the tower on the screen, he must shift the lens:

Discussion

10.	A force F acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of force. (a) Write the expression for the work done by the force. (b) What should be the angle between the force and displacement to get (i) zero, (ii) maximum, work?
Answer» A force F acts on a body and displaces it by a distance S in a direction at an angle $θ$ with the direction of force. (a) Write the expression for the work done by the force. (b) What should be the angle between the force and displacement to get (i) zero, (ii) maximum, work?

10.

A force F acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of force. (a) Write the expression for the work done by the force. (b) What should be the angle between the force and displacement to get (i) zero, (ii) maximum, work?

Answer»

A force F acts on a body and displaces it by a distance S in a direction at an angle $θ$ with the direction of force.

(a) Write the expression for the work done by the force.

(b) What should be the angle between the force and displacement to get (i) zero, (ii) maximum, work?

Discussion

11.	The velocity of light in diamond is 1,21,000 km s-1. The refractive index of the diamond is (Velocity of Light in air = 3 x 108 m s-1).
Answer» The velocity of light in diamond is 1,21,000 km s^-1. The refractive index of the diamond is (Velocity of Light in air = 3 x 10⁸ m s^-1).

Discussion

12.	If a combination of 3 convex lens is arranged in the shown manner the focal length of lens 1 is + 5 cm, lens II is 10 cm and lens III is 20 cm. Calculate the total power of the combination of the lens.
Answer» If a combination of 3 convex lens is arranged in the shown manner the focal length of lens 1 is + 5 cm, lens II is 10 cm and lens III is 20 cm. Calculate the total power of the combination of the lens.

12.

If a combination of 3 convex lens is arranged in the shown manner the focal length of lens 1 is + 5 cm, lens II is 10 cm and lens III is 20 cm. Calculate the total power of the combination of the lens.

Answer»

If a combination of 3 convex lens is arranged in the shown manner the focal length of lens 1 is + 5 cm, lens II is 10 cm and lens III is 20 cm. Calculate the total power of the combination of the lens.

Discussion

13.	What do you mean by the following statements: (i) the heat capacity of a body is 50 J K−1? (ii) the specific heat capacity of copper is 0.4J g−1K−1?
Answer» What do you mean by the following statements: (i) the heat capacity of a body is 50 J $K^{- 1}$ ? (ii) the specific heat capacity of copper is 0.4J $g^{- 1} K^{- 1}$ ?

13.

What do you mean by the following statements: (i) the heat capacity of a body is 50 J K−1? (ii) the specific heat capacity of copper is 0.4J g−1K−1?

Answer»

What do you mean by the following statements:

(i) the heat capacity of a body is 50 J $K^{- 1}$ ?

(ii) the specific heat capacity of copper is 0.4J $g^{- 1} K^{- 1}$ ?

Discussion

14.	A chunk of copper weighing 1 kg is drawn into a wire 1 mm2 thick. Another chunk of copper weighing 1 kg is drawn into a wire 2 mm2 thick. What is the ratio of their resistances?
Answer» A chunk of copper weighing $1 k g$ is drawn into a wire $1 m m^{2}$ thick. Another chunk of copper weighing $1 k g$ is drawn into a wire $2 m m^{2}$ thick. What is the ratio of their resistances?

Discussion

15.	What is a light year?
Answer» What is a light year?

Discussion

16.	A bullet fired into a wooden block loses half of its velocity after penetrating 40 cm. It comes to rest after penetrating a further distance of
Answer» A bullet fired into a wooden block loses half of its velocity after penetrating $40 cm .$ It comes to rest after penetrating a further distance of

Discussion

17.	what are the principals on which AC and DC generator work ?
Answer» what are the principals on which AC and DC generator work ?

Discussion

18.	___ is an optical illusion observed in a hot region due to total internal reflection.
Answer» ___ is an optical illusion observed in a hot region due to total internal reflection.

Discussion

19.	The expansion of a substance on heating is called ___expansion.
Answer» The expansion of a substance on heating is called ___expansion.

Discussion

20.	how is it so that a bulb glows as soon as it is switched on; though the electrons drift at a speed of about 1 or 2 cm/s.
Answer» how is it so that a bulb glows as soon as it is switched on; though the electrons drift at a speed of about 1 or 2 cm/s.

Discussion

21.	Why doesn't an electron just fall into the nucleus of an atom?
Answer» Why doesn't an electron just fall into the nucleus of an atom?

Discussion

22.	Given 'n' resistors of resistance R Ω. How should they be connected to get the minimum effective resistance?
Answer» Given 'n' resistors of resistance R $Ω$ . How should they be connected to get the minimum effective resistance?

Discussion

23.	All formula for the physics chapter electricty.
Answer» All formula for the physics chapter electricty.

Discussion

24.	If there are 3 wires connected to a plug having 3 pins namely live wire,neutral wire and earth wire...... Then how much wires are connected in 2 pin plug?????is any of the wire missing...
Answer» If there are 3 wires connected to a plug having 3 pins namely live wire,neutral wire and earth wire...... Then how much wires are connected in 2 pin plug?????is any of the wire missing...

Discussion

25.	There are two separate circuits which deliver power to our homes. Explain.
Answer» There are two separate circuits which deliver power to our homes. Explain.

Discussion

26.	Two resistors when connected in series have a resistance of 9W and when connected in parallel have a resistance of 2W. What is the resistance of each resistor?
Answer» Two resistors when connected in series have a resistance of 9W and when connected in parallel have a resistance of 2W. What is the resistance of each resistor?

Discussion

27.	The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 ms. The driver sees in his rear view mirror the image of the truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be?
Answer» The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 $\frac{m}{s}$ . The driver sees in his rear view mirror the image of the truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be?

Discussion

28.	When a number of resistors are connected in parallel, then their equivalent resistance is ______________ the smallest individual resistance.
Answer» When a number of resistors are connected in parallel, then their equivalent resistance is ______________ the smallest individual resistance.

Discussion

29.	Fill in the following blanks with suitable words : (a) Fleming's Rule for the motor effect uses the.......... hand. (b) A motor contains a kind of switch called a ............which reverses the current every half ..............
Answer» Fill in the following blanks with suitable words : (a) Fleming's Rule for the motor effect uses the.......... hand. (b) A motor contains a kind of switch called a ............which reverses the current every half ..............

29.

Fill in the following blanks with suitable words : (a) Fleming's Rule for the motor effect uses the.......... hand. (b) A motor contains a kind of switch called a ............which reverses the current every half ..............

Answer»

Fill in the following blanks with suitable words :

(a) Fleming's Rule for the motor effect uses the.......... hand.

(b) A motor contains a kind of switch called a ............which reverses the current every half ..............

Discussion

30.	What is the nature of the image formed by a convex lens if the magnification produced by the lens is, - 0.5 ?
Answer» What is the nature of the image formed by a convex lens if the magnification produced by the lens is, - 0.5 ?

Discussion

31.	State Fleming's left-hand rule.
Answer» State Fleming's left-hand rule.

Discussion

32.	State the principle of moments. Name one device based on it.
Answer» State the principle of moments. Name one device based on it.

Discussion

33.	A body of mass m falls down through a height h. Obtain an expression for the work done by the force of gravity.
Answer» A body of mass m falls down through a height h. Obtain an expression for the work done by the force of gravity.

Discussion

34.	Question 18 (c) A person needs a lens of power –4.5 D for correction of her vision. What is the nature of the corrective lens?
Answer» Question 18 (c) A person needs a lens of power –4.5 D for correction of her vision. What is the nature of the corrective lens?

Discussion

35.	There are two types of light-sensitive cells in the human eye : (a) Where are they found ? (b) What is each type called ? (c) To what is each type of cell sensitive ?
Answer» There are two types of light-sensitive cells in the human eye : (a) Where are they found ? (b) What is each type called ? (c) To what is each type of cell sensitive ?

Discussion

36.	Consider a particle of mass m suspended vertically by a string at the equator. Let R and M denote the radius and the mass of the earth respectively. If ω is the angular velocity of earth's rotation about its own axis, the tension in the string is equal to
Answer» Consider a particle of mass m suspended vertically by a string at the equator. Let R and M denote the radius and the mass of the earth respectively. If $ω$ is the angular velocity of earth's rotation about its own axis, the tension in the string is equal to

Discussion

37.	According to the law of reflection : (a) i/r = constant (b) sin i/sin r = constant (c) i + r = constant (d) i = r
Answer» According to the law of reflection : (a) i/r = constant (b) sin i/sin r = constant (c) i + r = constant (d) i = r

37.

According to the law of reflection : (a) i/r = constant (b) sin i/sin r = constant (c) i + r = constant (d) i = r

Answer»

According to the law of reflection :

(a) i/r = constant

(b) sin i/sin r = constant

(c) i + r = constant

(d) i = r

Discussion

38.	In a myopic eye, image is formed _____ the retina .
Answer» In a myopic eye, image is formed _____ the retina .

Discussion

39.	Three particles, each of mass m, are placed at the vertices of an equilateral triangle of side a. The net gravitational force on a body of mass M at the centroid of the triangle is
Answer» Three particles, each of mass m, are placed at the vertices of an equilateral triangle of side $a$ . The net gravitational force on a body of mass $M$ at the centroid of the triangle is

Discussion

40.	The focal length of a mirror is the
Answer» The focal length of a mirror is the

Discussion

41.	Question 2 (a) In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased;
Answer» Question 2 (a) In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased;

Discussion

42.	An object placed in one medium when seen from the other medium, appears to be vertically shifted. Name two factors on which the magnitude of shift depends and state how does it depend on them.
Answer» An object placed in one medium when seen from the other medium, appears to be vertically shifted. Name two factors on which the magnitude of shift depends and state how does it depend on them.

Discussion

43.	Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is varying the:
Answer» Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is varying the:

Discussion

44.	A block of plastic released under water come up to the surface of water because___________.
Answer» A block of plastic released under water come up to the surface of water because___________.

Discussion

45.	The velocity of light in a glass block of refractive index 1.5 is: (Velocity of light in air = 3 x 108 m s-1 )
Answer» The velocity of light in a glass block of refractive index 1.5 is: (Velocity of light in air = 3 x 10⁸ m s^-1)

45.

The velocity of light in a glass block of refractive index 1.5 is: (Velocity of light in air = 3 x 108 m s-1 )

Answer»

The velocity of light in a glass block of refractive index 1.5 is:

(Velocity of light in air = 3 x 10⁸ m s^-1)

Discussion

46.	A satellite of mass m is orbiting in an orbit of radius r. If time period of satellite is T, then
Answer» A satellite of mass $m$ is orbiting in an orbit of radius $r$ . If time period of satellite is $T$ , then

Discussion

47.	A person suffering from ___ will have a shorter far point.
Answer» A person suffering from ___ will have a shorter far point.

Discussion

48.	Which one of them is correct about resonance?
Answer» Which one of them is correct about resonance?

Discussion

49.	Let γr = Coefficient of real expansion γa = Coefficient of apparent expansion γa = Coefficient of volume expansion of vessel Then ,γr =___.
Answer» Let $γ_{r}$ = Coefficient of real expansion $γ_{a}$ = Coefficient of apparent expansion $γ_{a}$ = Coefficient of volume expansion of vessel Then , $γ_{r}$ =___.

49.

Let γr = Coefficient of real expansion γa = Coefficient of apparent expansion γa = Coefficient of volume expansion of vessel Then ,γr =___.

Answer»

Let $γ_{r}$ = Coefficient of real expansion

$γ_{a}$ = Coefficient of apparent expansion

$γ_{a}$ = Coefficient of volume expansion of vessel

Then , $γ_{r}$ =___.

Discussion

50.	What are the disadvantages of using fossil fuels?
Answer» What are the disadvantages of using fossil fuels?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A dentist uses a concave mirror of radius of curvature 3 cm and places an object at a distance of x cm from the mirror to get a magnification of +5 .Find x

Which part of the mirror reflects the light?

Why is reabsorption of urea don't take place ?

Why does a fuse have high resistance whereas low resistivity?

An image 2/3 of size of the object is formed by a convex lens at a distance of 12cm from it. Find the focal length of the lens

The r.m.s speed of oxygen at NTP is x m/s. If the gas is heated at constant pressure till its volume is four fold, what will be its final temperature and r.m.s speed?

A person has near point of his vision shifted to 50 cm. What lens must be used to see an object placed at 25 cm from the eye? What is the power of the lens?

A student has to connect 4 cells of 1.5 V each, to form a battery of voltage 6 V. The correct way of connecting these cells is shown in figure.

A student obtained a blurred image of an illuminated distant tower on a screen by using a convex lens In order to obtain sharp image of the tower on the screen, he must shift the lens:

A force F acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of force. (a) Write the expression for the work done by the force. (b) What should be the angle between the force and displacement to get (i) zero, (ii) maximum, work?

The velocity of light in diamond is 1,21,000 km s-1. The refractive index of the diamond is (Velocity of Light in air = 3 x 108 m s-1).

If a combination of 3 convex lens is arranged in the shown manner the focal length of lens 1 is + 5 cm, lens II is 10 cm and lens III is 20 cm. Calculate the total power of the combination of the lens.

What do you mean by the following statements: (i) the heat capacity of a body is 50 J K−1? (ii) the specific heat capacity of copper is 0.4J g−1K−1?

A chunk of copper weighing 1 kg is drawn into a wire 1 mm2 thick. Another chunk of copper weighing 1 kg is drawn into a wire 2 mm2 thick. What is the ratio of their resistances?

What is a light year?

A bullet fired into a wooden block loses half of its velocity after penetrating 40 cm. It comes to rest after penetrating a further distance of

what are the principals on which AC and DC generator work ?

___ is an optical illusion observed in a hot region due to total internal reflection.

The expansion of a substance on heating is called ___expansion.

how is it so that a bulb glows as soon as it is switched on; though the electrons drift at a speed of about 1 or 2 cm/s.

Why doesn't an electron just fall into the nucleus of an atom?

Given 'n' resistors of resistance R Ω. How should they be connected to get the minimum effective resistance?

All formula for the physics chapter electricty.

If there are 3 wires connected to a plug having 3 pins namely live wire,neutral wire and earth wire...... Then how much wires are connected in 2 pin plug?????is any of the wire missing...

There are two separate circuits which deliver power to our homes. Explain.

Two resistors when connected in series have a resistance of 9W and when connected in parallel have a resistance of 2W. What is the resistance of each resistor?

The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 ms. The driver sees in his rear view mirror the image of the truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be?

When a number of resistors are connected in parallel, then their equivalent resistance is ______________ the smallest individual resistance.

Fill in the following blanks with suitable words : (a) Fleming's Rule for the motor effect uses the.......... hand. (b) A motor contains a kind of switch called a ............which reverses the current every half ..............

What is the nature of the image formed by a convex lens if the magnification produced by the lens is, - 0.5 ?

State Fleming's left-hand rule.

State the principle of moments. Name one device based on it.

A body of mass m falls down through a height h. Obtain an expression for the work done by the force of gravity.

Question 18 (c) A person needs a lens of power –4.5 D for correction of her vision. What is the nature of the corrective lens?

There are two types of light-sensitive cells in the human eye : (a) Where are they found ? (b) What is each type called ? (c) To what is each type of cell sensitive ?

Consider a particle of mass m suspended vertically by a string at the equator. Let R and M denote the radius and the mass of the earth respectively. If ω is the angular velocity of earth's rotation about its own axis, the tension in the string is equal to

According to the law of reflection : (a) i/r = constant (b) sin i/sin r = constant (c) i + r = constant (d) i = r

In a myopic eye, image is formed _____ the retina .

Three particles, each of mass m, are placed at the vertices of an equilateral triangle of side a. The net gravitational force on a body of mass M at the centroid of the triangle is

The focal length of a mirror is the

Question 2 (a) In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased;

An object placed in one medium when seen from the other medium, appears to be vertically shifted. Name two factors on which the magnitude of shift depends and state how does it depend on them.

Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is varying the:

A block of plastic released under water come up to the surface of water because___________.

The velocity of light in a glass block of refractive index 1.5 is: (Velocity of light in air = 3 x 108 m s-1 )

A satellite of mass m is orbiting in an orbit of radius r. If time period of satellite is T, then

A person suffering from ___ will have a shorter far point.

Which one of them is correct about resonance?

Let γr = Coefficient of real expansion γa = Coefficient of apparent expansion γa = Coefficient of volume expansion of vessel Then ,γr =___.

What are the disadvantages of using fossil fuels?