16569 + Interview Questions in Physics

1.	The refractive index of glass with respect to air is 3/2 and the refractive index of water with respect to air is 4/3 . THE refractive index of glass with respect to air will be .
Answer» The refractive index of glass with respect to air is 3/2 and the refractive index of water with respect to air is 4/3 . THE refractive index of glass with respect to air will be .

Discussion

2.	The potential difference applied to a 3.2 mA X -ray tube is 5 kV. The number of the electrons striking the target per second is .
Answer» The potential difference applied to a 3.2 mA X -ray tube is 5 kV. The number of the electrons striking the target per second is .

Discussion

3.	For rotational equilibrium of a rigid body, it is essential that __
Answer» For rotational equilibrium of a rigid body, it is essential that __

Discussion

4.	A uniform rod of length L mass M and carrying current I is kept on the top of an inclined plane of angle of inclination theta. There is a uniform magnetic field B acting perpendicular to the plane. The coefficient of friction of the surface of the incline plane is (mu). Find the maximum and minimum value of magnetic field B such that the rod is at rest. Given acceleration due to gravity is g.
Answer» A uniform rod of length L mass M and carrying current I is kept on the top of an inclined plane of angle of inclination theta. There is a uniform magnetic field B acting perpendicular to the plane. The coefficient of friction of the surface of the incline plane is (mu). Find the maximum and minimum value of magnetic field B such that the rod is at rest. Given acceleration due to gravity is g.

Discussion

5.	If an n-channel enhancement MOSFET is biased in common source mode such that its gateto source voltage VGS= 2 Vand VT=1V. the value of trans conductance is______m℧ (Neglecting channel length modulation ).VDS=3V,μnCox(WL)=0.5mA/V2 0.5
Answer» $If an n-channel enhancement MOSFET is biased in common source mode such that its gate to source voltage V_{G S} = 2 V and V_{T} = 1 V . the value of trans conductance is______m ℧ (Neglecting channel length modulation ).$ $V_{D S} = 3 V, μ_{n} C_{o x} (\frac{W}{L}) = 0.5 m A / V^{2}$ 0.5

Discussion

6.	Which of the following are NOT fundamental physical quantities?
Answer» Which of the following are NOT fundamental physical quantities?

Discussion

7.	36. Consider energy density in a solenoid at it's centre and that near it's ends. Which of the two is greater ??
Answer» 36. Consider energy density in a solenoid at it's centre and that near it's ends. Which of the two is greater ??

Discussion

8.	What is the SI unit of specific heat capacity?
Answer» What is the SI unit of specific heat capacity?

Discussion

9.	The angular momentum of electron in ‘d‘ orbital is equal to :
Answer» The angular momentum of electron in ‘d‘ orbital is equal to :

Discussion

10.	Two charges are placed a certain distance apart in air. If a brass plate is introduced between them, the force between them will(1) increase(2) decrease(3) becomes zero (4) remains the same
Answer» Two charges are placed a certain distance apart in air. If a brass plate is introduced between them, the force between them will (1) increase (2) decrease (3) becomes zero (4) remains the same

Discussion

11.	We know that light refracts (or bends) when it goes from one medium to another. Now, the atmosphere contains only air. The how does light get refracted on passing through only air in the atmosphere ?
Answer» We know that light refracts (or bends) when it goes from one medium to another. Now, the atmosphere contains only air. The how does light get refracted on passing through only air in the atmosphere ?

Discussion

12.	The escape velocity from earth is ve. A body is projected with velocity 2ve. With what constant velocity will it move in the inter planetary space?
Answer» The escape velocity from earth is $v_{e}$ . A body is projected with velocity $2 v_{e}$ . With what constant velocity will it move in the inter planetary space?

Discussion

13.	three forces 20\sqrt{2 } N,20\sqrt{2 } N and 40N are acting along X,Y and Z axes respectively on a 5\sqrt{2 } mass at rest at the origin . the magnitude of its diplacement af
Answer» three forces 20\sqrt{2 } N,20\sqrt{2 } N and 40N are acting along X,Y and Z axes respectively on a 5\sqrt{2 } mass at rest at the origin . the magnitude of its diplacement af

Discussion

14.	Four 60 W, 230 V bulbs are connected between the phase and the neutral as shown in the diagram. Line voltage is 230 V. Which bulb/bulbs will glow at 60 W power?
Answer» Four 60 W, 230 V bulbs are connected between the phase and the neutral as shown in the diagram. Line voltage is 230 V. Which bulb/bulbs will glow at 60 W power?

14.

Four 60 W, 230 V bulbs are connected between the phase and the neutral as shown in the diagram. Line voltage is 230 V. Which bulb/bulbs will glow at 60 W power?

Answer»

Four 60 W, 230 V bulbs are connected between the phase and the neutral as shown in the diagram. Line voltage is 230 V.

Which bulb/bulbs will glow at 60 W power?

Discussion

15.	the correct order of equivalent conductances at infinite dilution in water at room temperature for H^+,K^+,CH3COO^- and HO^- ions is :
Answer» the correct order of equivalent conductances at infinite dilution in water at room temperature for H^+,K^+,CH3COO^- and HO^- ions is :

Discussion

16.

Name Age Year of becoming an astronaut No. of space Journeys Experience with zero gravity Ways of staying fit Memorable moments What one has learnt from the travels Barbara Morgan

Answer»

Name	Age	Year of becoming an astronaut	No. of space Journeys	Experience with zero gravity	Ways of staying fit	Memorable moments	What one has learnt from the travels
Barbara Morgan

Discussion

17.	Which product of the nuclear fission of uranium-235 is utilised to cause further fission of its nuclei?
Answer» Which product of the nuclear fission of uranium-235 is utilised to cause further fission of its nuclei?

Discussion

18.	Which out of the following properties of a proton can change while it moves freely in a uniform magnetic field?
Answer» Which out of the following properties of a proton can change while it moves freely in a uniform magnetic field?

Discussion

19.	Compare the power used in the 2 Ω resistor in each of the following circuits: (i) a 6 V battery in series with 1 Ω and 2 Ω resistors, and (ii) a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
Answer» Compare the power used in the 2 Ω resistor in each of the following circuits: (i) a 6 V battery in series with 1 Ω and 2 Ω resistors, and (ii) a 4 V battery in parallel with 12 Ω and 2 Ω resistors.

Discussion

20.	Can a neutral point be found at a point where two charges of equal and opposite magnitude interact? Due to the additive property of charge?
Answer» Can a neutral point be found at a point where two charges of equal and opposite magnitude interact? Due to the additive property of charge?

Discussion

21.	Match the events leading to the origin of life listed under column I with the time frame given under column II; choose the right answer which gives the correct combination of the alphabets of the two columns: Column-I Column-II EventsTime FrameAOrigin of universep3 billion years agoBOrigin of earthq4.6 billion years agoCOrigin of starsr10 billion years agoDOrigin of lifes14 billion years ago t5 billion years ago
Answer» Match the events leading to the origin of life listed under column I with the time frame given under column II; choose the right answer which gives the correct combination of the alphabets of the two columns: $\begin{matrix} Column-I & Column-II Events & Time Frame A & Origin of universe & p & 3 billion years ago B & Origin of earth & q & 4.6 billion years ago C & Origin of stars & r & 10 billion years ago D & Origin of life & s & 14 billion years ago t & 5 billion years ago \end{matrix}$

Discussion

22.	Which of the following are forest products that the local needs?
Answer» Which of the following are forest products that the local needs?

Discussion

23.	A bubble in glass slab (μ=1.5) appears at 5 cm when viewed from one side and at 2 cm when viewed from opposite side. The thickness of the slab is:
Answer» A bubble in glass slab $(μ = 1.5)$ appears at $5 cm$ when viewed from one side and at $2 cm$ when viewed from opposite side. The thickness of the slab is:

Discussion

24.	What are the disadvantages of solar power?
Answer» What are the disadvantages of solar power?

Discussion

25.	If the radius of the earth shrinks by 2%, mass remaining cons†an t , then how would the value of acceleration due to gravity change ?
Answer» If the radius of the earth shrinks by 2%, mass remaining cons†an t , then how would the value of acceleration due to gravity change ?

Discussion

26.	Electrical charge is measured in the units called __.
Answer» Electrical charge is measured in the units called __.

Discussion

27.	A body is pivoted at a point. A force of 20 N is applied at a distance of 20 cm from the pivot. Calculate the moment of force about the pivot.
Answer» A body is pivoted at a point. A force of $20 N$ is applied at a distance of $20 c m$ from the pivot. Calculate the moment of force about the pivot.

Discussion

28.	Force experienced by a current-carrying conductor placed in a magnetic field is largest when the angle between current and magnetic field is
Answer» Force experienced by a current-carrying conductor placed in a magnetic field is largest when the angle between current and magnetic field is

Discussion

29.	5. A child is shining a swing minimum and maximum height are 0.85 and 2 m respectively find maximum velocity swing
Answer» 5. A child is shining a swing minimum and maximum height are 0.85 and 2 m respectively find maximum velocity swing

Discussion

30.	Focal length of a concave mirror is −20 cm. Match the object distance(Real object) given in column II corresponding to magnification (only magnitude) given in column I. Column IColumn II(A)2(p)10 cm(B)12(q)30 cm(C)1(r)20 cm(D)14(s)none of these
Answer» Focal length of a concave mirror is $- 20 c m$ . Match the object distance(Real object) given in column $I I$ corresponding to magnification (only magnitude) given in column $I$ . $\begin{matrix} Column I & Column II (A) 2 & (p) 10 c m (B) \frac{1}{2} & (q) 30 c m (C) 1 & (r) 20 c m (D) \frac{1}{4} & (s) none of these \end{matrix}$

Discussion

31.	From a finite line charge, the net electric field at the point P on the equatorial line is equal to
Answer» From a finite line charge, the net electric field at the point $P$ on the equatorial line is equal to

Discussion

32.	How to find the frequency of waves generated by a open organ pipe,closed organ pipe,sonometer and resonance tube?
Answer» How to find the frequency of waves generated by a open organ pipe,closed organ pipe,sonometer and resonance tube?

Discussion

33.	(a) With the help of a labelled diagram, explain the construction and working of a solar cooker. (b) Why is the solar cooker box painted black from inside ? (c) Why is the solar cooker box covered with a glass sheet ?
Answer» (a) With the help of a labelled diagram, explain the construction and working of a solar cooker. (b) Why is the solar cooker box painted black from inside ? (c) Why is the solar cooker box covered with a glass sheet ?

Discussion

34.	A high speed car and an innocent insect have a head on collision.The force of impact splatters the poor insect over the windshield.Is the corresponding force that the insect exerts against the windshield greater ,less,or same? Is the retardation of the car greater than,less than,or the same as that of the insect?
Answer» A high speed car and an innocent insect have a head on collision.The force of impact splatters the poor insect over the windshield.Is the corresponding force that the insect exerts against the windshield greater ,less,or same? Is the retardation of the car greater than,less than,or the same as that of the insect?

Discussion

35.	a person s†an ds in contact against the inner wall of a rotor of radius r.the coefficient of friction between the wall and the clothing is μ and rotor is rotating about vertical axis.the minimum angular speed of the rotor so that the person does not slip downward is 1)\sqrt{μ g/r} 2)\sqrt{μ r/g} 3)\sqrt{g/μ r} 4)\sqrt{μ rg
Answer» a person s†an ds in contact against the inner wall of a rotor of radius r.the coefficient of friction between the wall and the clothing is μ and rotor is rotating about vertical axis.the minimum angular speed of the rotor so that the person does not slip downward is 1)\sqrt{μ g/r} 2)\sqrt{μ r/g} 3)\sqrt{g/μ r} 4)\sqrt{μ rg

Discussion

36.	A ball is dropped from a height H above the ground. On analysing the change of total energy with the height for this entire motion, which of the following is the correct graph for total energy (TE) vs the height from the ground (h)?
Answer» A ball is dropped from a height H above the ground. On analysing the change of total energy with the height for this entire motion, which of the following is the correct graph for total energy (TE) vs the height from the ground (h)?

Discussion

37.	State two differences between a convex and a concave lens.
Answer» State two differences between a convex and a concave lens.

Discussion

38.	define donor level and accepter leve
Answer» define donor level and accepter leve

Discussion

39.	A 10 cm tall candle when viewed using a convex lens appears to be 20 cm tall as shown in the below figure. The focal length of the lens is 5 cm. What is the object distance?
Answer» A $10 c m$ tall candle when viewed using a convex lens appears to be $20 c m$ tall as shown in the below figure. The focal length of the lens is $5 c m$ . What is the object distance?

39.

A 10 cm tall candle when viewed using a convex lens appears to be 20 cm tall as shown in the below figure. The focal length of the lens is 5 cm. What is the object distance?

Answer»

A $10 c m$ tall candle when viewed using a convex lens appears to be $20 c m$ tall as shown in the below figure. The focal length of the lens is $5 c m$ . What is the object distance?

Discussion

40.	A potentiometer circuit has been set up for findingthe internal resistance of a given cell. The mainbattery, used across the potentiormeter wire, has anemf of 2.0 V and a negligible internal resistance.The potentiometer wire itsel is 4 m long. Whenthe resistance, R connected across the given cell,has values of (i) Infinity, () 9.5 2, the 'balancinglengths', on the potentiometer wire are found to be3 m and 2.85 m, respectively. The value of internalresistance of the cell isAIPMT-2014(2) 0.95 2(4) 0.75 Ω(1) 0.25 Ω(3) 0.5 2
Answer» A potentiometer circuit has been set up for findingthe internal resistance of a given cell. The mainbattery, used across the potentiormeter wire, has anemf of 2.0 V and a negligible internal resistance.The potentiometer wire itsel is 4 m long. Whenthe resistance, R connected across the given cell,has values of (i) Infinity, () 9.5 2, the 'balancinglengths', on the potentiometer wire are found to be3 m and 2.85 m, respectively. The value of internalresistance of the cell isAIPMT-2014(2) 0.95 2(4) 0.75 Ω(1) 0.25 Ω(3) 0.5 2

Discussion

41.	State qualitative effect of inserting an iron core into a current carrying solenoid?
Answer» State qualitative effect of inserting an iron core into a current carrying solenoid?

Discussion

42.	The average power dissipated in a pure inductor is
Answer» The average power dissipated in a pure inductor is

Discussion

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

Discussion

44.	A body of mass 6 kg is acted upon by a constantforce F (2i-3j)N. If its initial velocity at t O is(3i+ 4)ms-1, then the time at which itsvelocity will be along the x-axis is(1) 10 s(3) 8 s(2) 6 s(4) Never
Answer» A body of mass 6 kg is acted upon by a constantforce F (2i-3j)N. If its initial velocity at t O is(3i+ 4)ms-1, then the time at which itsvelocity will be along the x-axis is(1) 10 s(3) 8 s(2) 6 s(4) Never

Discussion

45.	Copper wire is unsuitable for use as a fuse wire since:
Answer» Copper wire is unsuitable for use as a fuse wire since:

Discussion

46.	28. Why the refractive index was not measured diagonally in amorphous solids as that was done in true solids?
Answer» 28. Why the refractive index was not measured diagonally in amorphous solids as that was done in true solids?

Discussion

47.	Why is the AC supply in multiple of 11 like 110V, 220V etc?
Answer» Why is the AC supply in multiple of 11 like 110V, 220V etc?

Discussion

48.	A body is thrown vertically upwards. Its velocity goes on decreasing. What happens to its kinetic energy as its velocity becomes zero?
Answer» A body is thrown vertically upwards. Its velocity goes on decreasing. What happens to its kinetic energy as its velocity becomes zero?

Discussion

49.	A ball bearing operating at a load F has 8000 hours of life. The life of the bearing, in hours, when the load is doubled to 2F is
Answer» A ball bearing operating at a load $F$ has $8000$ hours of life. The life of the bearing, in hours, when the load is doubled to $2 F$ is

Discussion

50.	Why gravity and magnetism are not considered as a form of energy.......???
Answer» Why gravity and magnetism are not considered as a form of energy.......???

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The refractive index of glass with respect to air is 3/2 and the refractive index of water with respect to air is 4/3 . THE refractive index of glass with respect to air will be .

The potential difference applied to a 3.2 mA X -ray tube is 5 kV. The number of the electrons striking the target per second is .

For rotational equilibrium of a rigid body, it is essential that __

If an n-channel enhancement MOSFET is biased in common source mode such that its gateto source voltage VGS= 2 Vand VT=1V. the value of trans conductance is______m℧ (Neglecting channel length modulation ).VDS=3V,μnCox(WL)=0.5mA/V2 0.5

Which of the following are NOT fundamental physical quantities?

36. Consider energy density in a solenoid at it's centre and that near it's ends. Which of the two is greater ??

What is the SI unit of specific heat capacity?

The angular momentum of electron in ‘d‘ orbital is equal to :

Two charges are placed a certain distance apart in air. If a brass plate is introduced between them, the force between them will(1) increase(2) decrease(3) becomes zero (4) remains the same

We know that light refracts (or bends) when it goes from one medium to another. Now, the atmosphere contains only air. The how does light get refracted on passing through only air in the atmosphere ?

The escape velocity from earth is ve. A body is projected with velocity 2ve. With what constant velocity will it move in the inter planetary space?

three forces 20\sqrt{2 } N,20\sqrt{2 } N and 40N are acting along X,Y and Z axes respectively on a 5\sqrt{2 } mass at rest at the origin . the magnitude of its diplacement af

Four 60 W, 230 V bulbs are connected between the phase and the neutral as shown in the diagram. Line voltage is 230 V. Which bulb/bulbs will glow at 60 W power?

the correct order of equivalent conductances at infinite dilution in water at room temperature for H^+,K^+,CH3COO^- and HO^- ions is :

Name Age Year of becoming an astronaut No. of space Journeys Experience with zero gravity Ways of staying fit Memorable moments What one has learnt from the travels Barbara Morgan

Which product of the nuclear fission of uranium-235 is utilised to cause further fission of its nuclei?

Which out of the following properties of a proton can change while it moves freely in a uniform magnetic field?

Compare the power used in the 2 Ω resistor in each of the following circuits: (i) a 6 V battery in series with 1 Ω and 2 Ω resistors, and (ii) a 4 V battery in parallel with 12 Ω and 2 Ω resistors.

Can a neutral point be found at a point where two charges of equal and opposite magnitude interact? Due to the additive property of charge?

Which of the following are forest products that the local needs?

A bubble in glass slab (μ=1.5) appears at 5 cm when viewed from one side and at 2 cm when viewed from opposite side. The thickness of the slab is:

What are the disadvantages of solar power?

If the radius of the earth shrinks by 2%, mass remaining cons†an t , then how would the value of acceleration due to gravity change ?

Electrical charge is measured in the units called __.

A body is pivoted at a point. A force of 20 N is applied at a distance of 20 cm from the pivot. Calculate the moment of force about the pivot.

Force experienced by a current-carrying conductor placed in a magnetic field is largest when the angle between current and magnetic field is

5. A child is shining a swing minimum and maximum height are 0.85 and 2 m respectively find maximum velocity swing

Focal length of a concave mirror is −20 cm. Match the object distance(Real object) given in column II corresponding to magnification (only magnitude) given in column I. Column IColumn II(A)2(p)10 cm(B)12(q)30 cm(C)1(r)20 cm(D)14(s)none of these

From a finite line charge, the net electric field at the point P on the equatorial line is equal to

How to find the frequency of waves generated by a open organ pipe,closed organ pipe,sonometer and resonance tube?

(a) With the help of a labelled diagram, explain the construction and working of a solar cooker. (b) Why is the solar cooker box painted black from inside ? (c) Why is the solar cooker box covered with a glass sheet ?

A ball is dropped from a height H above the ground. On analysing the change of total energy with the height for this entire motion, which of the following is the correct graph for total energy (TE) vs the height from the ground (h)?

State two differences between a convex and a concave lens.

define donor level and accepter leve

A 10 cm tall candle when viewed using a convex lens appears to be 20 cm tall as shown in the below figure. The focal length of the lens is 5 cm. What is the object distance?

State qualitative effect of inserting an iron core into a current carrying solenoid?

The average power dissipated in a pure inductor is

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

A body of mass 6 kg is acted upon by a constantforce F (2i-3j)N. If its initial velocity at t O is(3i+ 4)ms-1, then the time at which itsvelocity will be along the x-axis is(1) 10 s(3) 8 s(2) 6 s(4) Never

Copper wire is unsuitable for use as a fuse wire since:

28. Why the refractive index was not measured diagonally in amorphous solids as that was done in true solids?

Why is the AC supply in multiple of 11 like 110V, 220V etc?

A body is thrown vertically upwards. Its velocity goes on decreasing. What happens to its kinetic energy as its velocity becomes zero?

A ball bearing operating at a load F has 8000 hours of life. The life of the bearing, in hours, when the load is doubled to 2F is

Why gravity and magnetism are not considered as a form of energy.......???