16569 + Interview Questions in Physics

1.	The largest force experienced by a current carrying conductor placed in a magnetic field is when the angle between the conductor and the magnetic field is:
Answer» The largest force experienced by a current carrying conductor placed in a magnetic field is when the angle between the conductor and the magnetic field is:

Discussion

2.	In the circuit shown, A and B represent two inputs and C represents the output. The circuit represents
Answer» In the circuit shown, A and B represent two inputs and C represents the output. The circuit represents

Discussion

3.	A parallel beam of light falls on a convex lens .images of blue yellow and red are formed by lens at 0.20m 0.205m 0.214 m what is dispersive power of lens
Answer» A parallel beam of light falls on a convex lens .images of blue yellow and red are formed by lens at 0.20m 0.205m 0.214 m what is dispersive power of lens

Discussion

4.	What is difference between rotational motion and circular motion?
Answer» What is difference between rotational motion and circular motion?

Discussion

5.	5.The minimum distance between an object and its real image formed by a convex lens is (A)1.5f (B)2f (C)2.5f (D)4f
Answer» 5.The minimum distance between an object and its real image formed by a convex lens is (A)1.5f (B)2f (C)2.5f (D)4f

Discussion

6.	A wire of 3 ohms resistance and 15 cm in length is stretched to 45 cm in length. Calculate the following: i) New cross sectional area ii) New resistance iii) Resistivity. Assume that wire has a uniform cross sectional area.
Answer» A wire of 3 ohms resistance and 15 cm in length is stretched to 45 cm in length. Calculate the following: i) New cross sectional area ii) New resistance iii) Resistivity. Assume that wire has a uniform cross sectional area.

6.

A wire of 3 ohms resistance and 15 cm in length is stretched to 45 cm in length. Calculate the following: i) New cross sectional area ii) New resistance iii) Resistivity. Assume that wire has a uniform cross sectional area.

Answer»

A wire of 3 ohms resistance and 15 cm in length is stretched to 45 cm in length. Calculate the following:

i) New cross sectional area

ii) New resistance

iii) Resistivity.

Assume that wire has a uniform cross sectional area.

Discussion

7.	A convex lens of focal length f produces a real image x the size of an object then the find the distance of the object from the lens
Answer» A convex lens of focal length f produces a real image x the size of an object then the find the distance of the object from the lens

Discussion

8.	What is the role of the ciliary muscles?
Answer» What is the role of the ciliary muscles?

Discussion

9.	Why there is less gravity on moon than earth
Answer» Why there is less gravity on moon than earth

Discussion

10.	If a magnesium ribbon undergoes combustion it gains weight.does this phenomenon violate the law of conservation of mass?
Answer» If a magnesium ribbon undergoes combustion it gains weight.does this phenomenon violate the law of conservation of mass?

Discussion

11.	Explain how the working of telescope.
Answer» Explain how the working of telescope.

Discussion

12.	The current decaying in a circuit has a function i=I0e−t/τ where τ is the time constant of the circuit. Find rms value of the current for the period t=0 to t=τ.
Answer» The current decaying in a circuit has a function $i = I_{0} e^{- t / τ}$ where $τ$ is the time constant of the circuit. Find $r m s$ value of the current for the period $t = 0 to t = τ$ .

Discussion

13.	A convergent beam seems to converge at a point which is 15 cm behind a mirror, but due to reflection at the mirror, the beam diverges and seems to emerge from a point which is 12 cm behind mirror, find focal length of mirror.
Answer» A convergent beam seems to converge at a point which is $15 c m$ behind a mirror, but due to reflection at the mirror, the beam diverges and seems to emerge from a point which is $12 c m$ behind mirror, find focal length of mirror.

Discussion

14.	How power is directly proportional to third Power of velocity
Answer» How power is directly proportional to third Power of velocity

Discussion

15.	A(g) -> 2B(g) + C(g)For the above equilibrium, if initial pressure is 100 atm and pressure at equilibrium is 200 atm, Kp of the reaction is(1) 10000 (2) 1000(3) 100 (4) 20000
Answer» A(g) -> 2B(g) + C(g) For the above equilibrium, if initial pressure is 100 atm and pressure at equilibrium is 200 atm, Kp of the reaction is (1) 10000 (2) 1000 (3) 100 (4) 20000

Discussion

16.	uranium 238 nucleus initially at rest emits an Alpha particle with energy E the recoil speed of residual nucleus thorium 234 is
Answer» uranium 238 nucleus initially at rest emits an Alpha particle with energy E the recoil speed of residual nucleus thorium 234 is

Discussion

17.	Answer the followings.(1) What do you mean by dispersion? Name the different colours of light in the proper sequence in the spectrum of light.(2) Explain how the formation of rainbow occurs.(3) What is refraction of light? How is it related to refractive index?
Answer» Answer the followings. (1) What do you mean by dispersion? Name the different colours of light in the proper sequence in the spectrum of light. (2) Explain how the formation of rainbow occurs. (3) What is refraction of light? How is it related to refractive index?

17.

Answer the followings.(1) What do you mean by dispersion? Name the different colours of light in the proper sequence in the spectrum of light.(2) Explain how the formation of rainbow occurs.(3) What is refraction of light? How is it related to refractive index?

Answer»

Answer the followings.

(1) What do you mean by dispersion? Name the different colours of light in the proper sequence in the spectrum of light.

(2) Explain how the formation of rainbow occurs.

(3) What is refraction of light? How is it related to refractive index?

Discussion

18.	Question 17A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
Answer» Question 17 A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

Discussion

19.	Prove thatfor real image by converging lens the minimum dis†an ce between object and image should be 4f, where f is focal length of the lens.
Answer» Prove thatfor real image by converging lens the minimum dis†an ce between object and image should be 4f, where f is focal length of the lens.

Discussion

20.	A bar magnet when placed at an angle of 30 degree to the direction of magnetic field induction of 5(10)-2 T,experiencing a moment of couple 25 (10)-6 Nm.If the length of the magnet is5 cm,its pole strength is?
Answer» A bar magnet when placed at an angle of 30 degree to the direction of magnetic field induction of 5(10)-2 T,experiencing a moment of couple 25 (10)-6 Nm.If the length of the magnet is5 cm,its pole strength is?

Discussion

21.	Which of the following is not the possible path followed by cathode rays ejecting from the surface of a cathode?
Answer» Which of the following is not the possible path followed by cathode rays ejecting from the surface of a cathode?

Discussion

22.	If a mirror forms a real inverted image of same size then which of the following mirrors and position of object can be correct?
Answer» If a mirror forms a real inverted image of same size then which of the following mirrors and position of object can be correct?

Discussion

23.	10.Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistances are 3:4:5 . What is the ratio of distances of middle wire from the others if the net force experienced by it is zero 1. 4:3 2. 3:1 3. 5:3 4. 2:3
Answer» 10.Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistances are 3:4:5 . What is the ratio of distances of middle wire from the others if the net force experienced by it is zero 1. 4:3 2. 3:1 3. 5:3 4. 2:3

Discussion

24.	A force of 10N is required to move a conducting loop through a non uniform magnetic field at 2m/s. the rate of production of electrical energy in loop is?
Answer» A force of 10N is required to move a conducting loop through a non uniform magnetic field at 2m/s. the rate of production of electrical energy in loop is?

Discussion

25.	How sound waves travel in air?
Answer» How sound waves travel in air?

Discussion

26.	The approximate value of the solar constant is?
Answer» The approximate value of the solar constant is?

Discussion

27.	In an AC circuit, only a resistor of resistance 15 ohm is present. If voltage applied is V = 150sin(50t) volt, then rms current is(1) 5 root2 A(2) 5 A(3) 10 A(4) 10 root2 A
Answer» In an AC circuit, only a resistor of resistance 15 ohm is present. If voltage applied is V = 150sin(50t) volt, then rms current is (1) 5 root2 A (2) 5 A (3) 10 A (4) 10 root2 A

Discussion

28.	64. In the circuit shown,if a conducting wire is connected between points A and B , the current in this wire will Refer the attachment for figure 1. Flow from A to B 2. Flow in the direction which will be decided by the value of V 3. Be zero 4. Flow from B to A
Answer» 64. In the circuit shown,if a conducting wire is connected between points A and B , the current in this wire will Refer the attachment for figure 1. Flow from A to B 2. Flow in the direction which will be decided by the value of V 3. Be zero 4. Flow from B to A

Discussion

29.	The refractive indices of four substances P, Q, R and S are 1.50, 1.36, 1.77 and 1.31 respectively. The speed of light is the maximum in the substance : (a) P (b) Q (c) R (d) S
Answer» The refractive indices of four substances P, Q, R and S are 1.50, 1.36, 1.77 and 1.31 respectively. The speed of light is the maximum in the substance : (a) P (b) Q (c) R (d) S

Discussion

30.	If absolute refractive indices of glass and water are respectively then refractive index of water w.r.t. glass will beOptions: 1)8/92)9/83)3/84)4/9
Answer» If absolute refractive indices of glass and water are respectively then refractive index of water w.r.t. glass will be Options: 1)8/9 2)9/8 3)3/8 4)4/9

Discussion

31.	What is resolution limit and resolving power of telescope and microscope?
Answer» What is resolution limit and resolving power of telescope and microscope?

Discussion

32.	Figure shows a concave mirror of focal length 10 cm. A point object on the principal axis at a distance of 15 cm from the pole starts moving away from the pole and its position-time relation is given by x=−(5t2+10t+15) cm/s. The speed of the image at t=1 s will be
Answer» Figure shows a concave mirror of focal length $10 cm$ . A point object on the principal axis at a distance of $15 cm$ from the pole starts moving away from the pole and its position-time relation is given by $x = - (5 t^{2} + 10 t + 15) cm/s$ . The speed of the image at $t = 1 s$ will be

Discussion

33.	What is magnetic dipole?
Answer» What is magnetic dipole?

Discussion

34.	a Plano convex lens behaves as a concave mirror of focal length 30cm when its plane surface is silvered and has a concave mirror of focal length 10cm when its curved surface is silvered the refractive index of the material is
Answer» a Plano convex lens behaves as a concave mirror of focal length 30cm when its plane surface is silvered and has a concave mirror of focal length 10cm when its curved surface is silvered the refractive index of the material is

Discussion

35.	(a) What is a nuclear reactor? What is the fuel used in a nuclear reactor?(b) What type of nuclear reaction is carried out in a nuclear reactor?(c) How is the working nuclear reactor of a power plant shut down in an emergency?(d) Name five places in India where nuclear power plants are located.
Answer» (a) What is a nuclear reactor? What is the fuel used in a nuclear reactor? (b) What type of nuclear reaction is carried out in a nuclear reactor? (c) How is the working nuclear reactor of a power plant shut down in an emergency? (d) Name five places in India where nuclear power plants are located.

Discussion

36.	Is electrostatic potential necessarily zero at point where electric field is zero?
Answer» Is electrostatic potential necessarily zero at point where electric field is zero?

Discussion

37.	Name two factors on which the refractive index of a medium depends? State how does it depend on the factors stated by you.
Answer» Name two factors on which the refractive index of a medium depends? State how does it depend on the factors stated by you.

Discussion

38.	In the above figure, the parallel rays meet/appear to meet ___.
Answer» In the above figure, the parallel rays meet/appear to meet ___.

38.

In the above figure, the parallel rays meet/appear to meet ___.

Answer»

In the above figure, the parallel rays meet/appear to meet ___.

Discussion

39.	Two planets have the same average density but their radii are R1 and R2. If acceleration due to gravity on these planets be g1 and g2 respectively, then
Answer» Two planets have the same average density but their radii are $R_{1}$ and $R_{2}$ . If acceleration due to gravity on these planets be $g_{1}$ and $g_{2}$ respectively, then

Discussion

40.	A person cannot see distinctly at a distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm.
Answer» A person cannot see distinctly at a distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm.

Discussion

41.	Three resistors R1= 1 Ω , R2 = 100 Ω , R3 = 1000 Ω are connected in parallel. Which relation holds true?
Answer» Three resistors R1= 1 Ω , R2 = 100 Ω , R3 = 1000 Ω are connected in parallel. Which relation holds true?

Discussion

42.	THE WEIGHT OF A BODY in water IS ONE THIRD OF ITS WEIGHT IN AIR .THE DENSITY OF BODY IS
Answer» THE WEIGHT OF A BODY in water IS ONE THIRD OF ITS WEIGHT IN AIR .THE DENSITY OF BODY IS

Discussion

43.	Which of the following appliance does not use heating effect of current?
Answer» Which of the following appliance does not use heating effect of current?

Discussion

44.	Light is incident from glass (μ=1.5) to water (μ=1.33). Find the range of the angle of deviation for which there are two angles of incidence.
Answer» Light is incident from glass $(μ = 1.5)$ to water $(μ = 1.33)$ . Find the range of the angle of deviation for which there are two angles of incidence.

Discussion

45.	Four cells of emf e and internal resistance r are connected in parallel combination. The equivalent emf of this combination is
Answer» Four cells of emf e and internal resistance r are connected in parallel combination. The equivalent emf of this combination is

Discussion

46.	When a body of mass 25 kg is suspended from a sonometre wire then it vibrates with frequency 200 hertz. If the volume of the body is 0.009 metre cube and it is immersed in water then the frequency of vibration of the wire will be-
Answer» When a body of mass 25 kg is suspended from a sonometre wire then it vibrates with frequency 200 hertz. If the volume of the body is 0.009 metre cube and it is immersed in water then the frequency of vibration of the wire will be-

Discussion

47.	Ice cream appears colder to the mouth than water at 0oC. Give reason.
Answer» Ice cream appears colder to the mouth than water at $0^{o} C$ . Give reason.

47.

Ice cream appears colder to the mouth than water at 0oC. Give reason.

Answer»

Ice cream appears colder to the mouth than water at $0^{o} C$ . Give reason.

Discussion

48.	Calculate the amount of work done in shifting a charge of 2C from a point A to B having potential 10V and -5V respectively.
Answer» Calculate the amount of work done in shifting a charge of 2C from a point A to B having potential 10V and -5V respectively.

Discussion

49.	Which one of the following minerals is a fossil fuel?
Answer» Which one of the following minerals is a fossil fuel?

Discussion

50.	The fuel used in a nuclear reactor is ______.
Answer» The fuel used in a nuclear reactor is ______.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The largest force experienced by a current carrying conductor placed in a magnetic field is when the angle between the conductor and the magnetic field is:

In the circuit shown, A and B represent two inputs and C represents the output. The circuit represents

A parallel beam of light falls on a convex lens .images of blue yellow and red are formed by lens at 0.20m 0.205m 0.214 m what is dispersive power of lens

What is difference between rotational motion and circular motion?

5.The minimum distance between an object and its real image formed by a convex lens is (A)1.5f (B)2f (C)2.5f (D)4f

A wire of 3 ohms resistance and 15 cm in length is stretched to 45 cm in length. Calculate the following: i) New cross sectional area ii) New resistance iii) Resistivity. Assume that wire has a uniform cross sectional area.

A convex lens of focal length f produces a real image x the size of an object then the find the distance of the object from the lens

What is the role of the ciliary muscles?

Why there is less gravity on moon than earth

If a magnesium ribbon undergoes combustion it gains weight.does this phenomenon violate the law of conservation of mass?

Explain how the working of telescope.

The current decaying in a circuit has a function i=I0e−t/τ where τ is the time constant of the circuit. Find rms value of the current for the period t=0 to t=τ.

A convergent beam seems to converge at a point which is 15 cm behind a mirror, but due to reflection at the mirror, the beam diverges and seems to emerge from a point which is 12 cm behind mirror, find focal length of mirror.

How power is directly proportional to third Power of velocity

A(g) -> 2B(g) + C(g)For the above equilibrium, if initial pressure is 100 atm and pressure at equilibrium is 200 atm, Kp of the reaction is(1) 10000 (2) 1000(3) 100 (4) 20000

uranium 238 nucleus initially at rest emits an Alpha particle with energy E the recoil speed of residual nucleus thorium 234 is

Answer the followings.(1) What do you mean by dispersion? Name the different colours of light in the proper sequence in the spectrum of light.(2) Explain how the formation of rainbow occurs.(3) What is refraction of light? How is it related to refractive index?

Question 17A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?

Prove thatfor real image by converging lens the minimum dis†an ce between object and image should be 4f, where f is focal length of the lens.

A bar magnet when placed at an angle of 30 degree to the direction of magnetic field induction of 5(10)-2 T,experiencing a moment of couple 25 (10)-6 Nm.If the length of the magnet is5 cm,its pole strength is?

Which of the following is not the possible path followed by cathode rays ejecting from the surface of a cathode?

If a mirror forms a real inverted image of same size then which of the following mirrors and position of object can be correct?

10.Three long straight wires are connected parallel to each other across a battery of negligible internal resistance. The ratio of their resistances are 3:4:5 . What is the ratio of distances of middle wire from the others if the net force experienced by it is zero 1. 4:3 2. 3:1 3. 5:3 4. 2:3

A force of 10N is required to move a conducting loop through a non uniform magnetic field at 2m/s. the rate of production of electrical energy in loop is?

How sound waves travel in air?

The approximate value of the solar constant is?

In an AC circuit, only a resistor of resistance 15 ohm is present. If voltage applied is V = 150sin(50t) volt, then rms current is(1) 5 root2 A(2) 5 A(3) 10 A(4) 10 root2 A

64. In the circuit shown,if a conducting wire is connected between points A and B , the current in this wire will Refer the attachment for figure 1. Flow from A to B 2. Flow in the direction which will be decided by the value of V 3. Be zero 4. Flow from B to A

The refractive indices of four substances P, Q, R and S are 1.50, 1.36, 1.77 and 1.31 respectively. The speed of light is the maximum in the substance : (a) P (b) Q (c) R (d) S

If absolute refractive indices of glass and water are respectively then refractive index of water w.r.t. glass will beOptions: 1)8/92)9/83)3/84)4/9

What is resolution limit and resolving power of telescope and microscope?

Figure shows a concave mirror of focal length 10 cm. A point object on the principal axis at a distance of 15 cm from the pole starts moving away from the pole and its position-time relation is given by x=−(5t2+10t+15) cm/s. The speed of the image at t=1 s will be

What is magnetic dipole?

a Plano convex lens behaves as a concave mirror of focal length 30cm when its plane surface is silvered and has a concave mirror of focal length 10cm when its curved surface is silvered the refractive index of the material is

(a) What is a nuclear reactor? What is the fuel used in a nuclear reactor?(b) What type of nuclear reaction is carried out in a nuclear reactor?(c) How is the working nuclear reactor of a power plant shut down in an emergency?​(d) Name five places in India where nuclear power plants are located.

Is electrostatic potential necessarily zero at point where electric field is zero?

Name two factors on which the refractive index of a medium depends? State how does it depend on the factors stated by you.

In the above figure, the parallel rays meet/appear to meet ___.

Two planets have the same average density but their radii are R1 and R2. If acceleration due to gravity on these planets be g1 and g2 respectively, then

A person cannot see distinctly at a distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm.

Three resistors R1= 1 Ω , R2 = 100 Ω , R3 = 1000 Ω are connected in parallel. Which relation holds true?

THE WEIGHT OF A BODY in water IS ONE THIRD OF ITS WEIGHT IN AIR .THE DENSITY OF BODY IS

Which of the following appliance does not use heating effect of current?

Light is incident from glass (μ=1.5) to water (μ=1.33). Find the range of the angle of deviation for which there are two angles of incidence.

Four cells of emf e and internal resistance r are connected in parallel combination. The equivalent emf of this combination is

When a body of mass 25 kg is suspended from a sonometre wire then it vibrates with frequency 200 hertz. If the volume of the body is 0.009 metre cube and it is immersed in water then the frequency of vibration of the wire will be-

Ice cream appears colder to the mouth than water at 0oC. Give reason.

Calculate the amount of work done in shifting a charge of 2C from a point A to B having potential 10V and -5V respectively.

Which one of the following minerals is a fossil fuel?

The fuel used in a nuclear reactor is ______.

(a) What is a nuclear reactor? What is the fuel used in a nuclear reactor?(b) What type of nuclear reaction is carried out in a nuclear reactor?(c) How is the working nuclear reactor of a power plant shut down in an emergency?(d) Name five places in India where nuclear power plants are located.