16569 + Interview Questions in Physics

1.	A solenoid of radius R and length L has a current I = I0 cosωt. The value of induced electric field at a distance of r outside the solenoid, is :
Answer» A solenoid of radius R and length L has a current I = I0 cosωt. The value of induced electric field at a distance of r outside the solenoid, is :

Discussion

2.	What is meant by moving coil galvanometer?
Answer» What is meant by moving coil galvanometer?

Discussion

3.	A particle moves at angle with the horizontal from ground . If slope of the trajectory of the particle is m . Then dm/dt as function of time can be represented as
Answer» A particle moves at angle with the horizontal from ground . If slope of the trajectory of the particle is m . Then dm/dt as function of time can be represented as

Discussion

4.	The nucleus of a _______ atom (such as uranium, plutonium or thorium), when bombarded with__________ neutrons, can be split into lighter nuclei.
Answer» The nucleus of a _______ atom (such as uranium, plutonium or thorium), when bombarded with__________ neutrons, can be split into lighter nuclei.

Discussion

5.	Name the person who is most remembered for the protection of Khejri trees in Rajasthan.
Answer» Name the person who is most remembered for the protection of Khejri trees in Rajasthan.

Discussion

6.	If a ray of light travels from water (μw) to air (μa). Find the critical angle?
Answer» If a ray of light travels from water (μ_w) to air (μ_a). Find the critical angle?

Discussion

7.	Electronic controller produces an output of
Answer» Electronic controller produces an output of

Discussion

8.	Question 2Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.
Answer» Question 2 Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.

Discussion

9.	If gravitational potential energy of earth and a block of mass m is taken zero at the surface then potential energy of this system at a height Re above the surface is-1.mgR/22.mgR 3.-mgR /24.-mgR
Answer» If gravitational potential energy of earth and a block of mass m is taken zero at the surface then potential energy of this system at a height Re above the surface is- 1.mgR/2 2.mgR 3.-mgR /2 4.-mgR

Discussion

10.	Question 3 The gravitational force between two objects is F. If masses of both objects are halved without changing distance between them, then the gravitational force would become (a) F4 (b) F2 (c) F (d) 2F
Answer» Question 3 The gravitational force between two objects is F. If masses of both objects are halved without changing distance between them, then the gravitational force would become (a) $\frac{F}{4}$ (b) $\frac{F}{2}$ (c) $F$ (d) $2 F$

Discussion

11.	104. An electric iron draws a current of 1A when voltage is 100V. If voltage is now changed to 400V, will it make any difference to the current flowing?
Answer» 104. An electric iron draws a current of 1A when voltage is 100V. If voltage is now changed to 400V, will it make any difference to the current flowing?

Discussion

12.	2.Why the Charges are accumulated at the sharp edges of the Conductors??
Answer» 2.Why the Charges are accumulated at the sharp edges of the Conductors??

Discussion

13.

(a)Given below are five lines from a poem but they are not in the right order. Get into groups of four. Read the lines and put them in the right order. Read the version that you develop to the whole class. The voice of the thunder declares my arrival I emerge from the heart of the Sea I descend and embrace the flowers I am dotted silver threads dropped from heaven The rainbow announces my departure (b) What is ‘I’ in these lines?

Answer»

(a)Given below are five lines from a
poem but they are not in the right order.

Get
into groups of four. Read the lines and put them in the right order.
Read the version that you develop to the whole class.

The voice of the thunder declares
my arrival

I emerge from the heart of the Sea

I
descend and embrace the flowers

I am dotted silver threads dropped
from heaven

The rainbow announces my departure

(b) What is
‘I’
in these lines?

Discussion

14.	Explain laws of reflection.
Answer» Explain laws of reflection.

Discussion

15.	Two identical small conducting sphere are separated of 1m. The sphere originally the same positive charge and the force between them F^°. Half of the charge on one sphere is then moved to other sphere. The force between the sphere is now
Answer» Two identical small conducting sphere are separated of 1m. The sphere originally the same positive charge and the force between them F^°. Half of the charge on one sphere is then moved to other sphere. The force between the sphere is now

Discussion

16.	25.When water is filled in a container to a height of 16 cm, it appears half filled when viewed from top. The height of the vessel is (refractive index of water 4/3) 1.10 cm 2.14 cm 3.28 cm 4.32 cm
Answer» 25.When water is filled in a container to a height of 16 cm, it appears half filled when viewed from top. The height of the vessel is (refractive index of water 4/3) 1.10 cm 2.14 cm 3.28 cm 4.32 cm

Discussion

17.	An electric bulb draw a electric current 0.2A when voltage was 220 volt. Find the amount of electric charge flow in 1 hour
Answer» An electric bulb draw a electric current 0.2A when voltage was 220 volt. Find the amount of electric charge flow in 1 hour

Discussion

18.	In the process of extraction of Cu,FeSi03 is produced as slag.Which of the below mentioned way can we handle it?
Answer» In the process of extraction of Cu,FeSi0₃ is produced as slag.Which of the below mentioned way can we handle it?

Discussion

19.	What are the two ways in which you can trace the magnetic field pattern of a bar magnet ?
Answer» What are the two ways in which you can trace the magnetic field pattern of a bar magnet ?

Discussion

20.	18. a telescope has objective of focal length 200 cm and eye piece with f=2cm .if its used to see a 50 m tall building at a distance of 2km ,what is height of image of the building formed by objective lens ? 1.1ccm 2.10 cm 3.5 cm 4.2 cm
Answer» 18. a telescope has objective of focal length 200 cm and eye piece with f=2cm .if its used to see a 50 m tall building at a distance of 2km ,what is height of image of the building formed by objective lens ? 1.1ccm 2.10 cm 3.5 cm 4.2 cm

Discussion

21.	Calculate the current flowing through 1.5 kW-250 V electric heater and also find its resistance. [3 MARKS]
Answer» Calculate the current flowing through 1.5 kW-250 V electric heater and also find its resistance. [3 MARKS]

Discussion

22.	the frequency of an electromagnetic radiation whose wavelength is 5×10^{-2}nm i
Answer» the frequency of an electromagnetic radiation whose wavelength is 5×10^{-2}nm i

Discussion

23.	A 35mm wide slide with a 24mm36mm picture is projected on a screen placed 12cm from the slide. The image of slide picture on the screen measures 1.0m1.5m. What is the linear magnification of the projector screen?
Answer» A 35mm wide slide with a 24mm36mm picture is projected on a screen placed 12cm from the slide. The image of slide picture on the screen measures 1.0m1.5m. What is the linear magnification of the projector screen?

Discussion

24.	an electron is moving in circular path of radius 0.25 with time of 10^{-19} then find out the current flowing
Answer» an electron is moving in circular path of radius 0.25 with time of 10^{-19} then find out the current flowing

Discussion

25.	Bring out the parallel suggested between the predatory instincts of the bird and human behaviour.
Answer» Bring out the parallel suggested between the predatory instincts of the bird and human behaviour.

Discussion

26.	Which of the following mirror will always form virtual and diminished image irrespective of object location?
Answer» Which of the following mirror will always form virtual and diminished image irrespective of object location?

Discussion

27.	How much electrical energy flows through a wire in 1 second when the power is 1 kW?
Answer» How much electrical energy flows through a wire in 1 second when the power is 1 kW?

Discussion

28.	A ray of light moving in air strikes at origin at { grazing angle and then follows a path 2y=x^2 for {x≥0 and y≥0. The correct variation of { refractive index with x co-crdinate is
Answer» A ray of light moving in air strikes at origin at { grazing angle and then follows a path 2y=x^2 for {x≥0 and y≥0. The correct variation of { refractive index with x co-crdinate is

Discussion

29.	B2is \lbrack where B is20. The dimensional formula ofmagnetic field, q charge, V electric potential andpermeability\rbrack(1) \lbrack MO L-3 TO(2) \lbrack ML-3 T(3) \lbrack MO L3 TO(4) \lbrack M L3 To\rbrack
Answer» B2is \lbrack where B is20. The dimensional formula ofmagnetic field, q charge, V electric potential andpermeability\rbrack(1) \lbrack MO L-3 TO(2) \lbrack ML-3 T(3) \lbrack MO L3 TO(4) \lbrack M L3 To\rbrack

Discussion

30.	what is the refractive index of gold
Answer» what is the refractive index of gold

Discussion

31.	Question 1A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?
Answer» Question 1 A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?

Discussion

32.	When there are little drops of water on TV or mobile screen why do we see colours like red blue green and violet in the droplets.
Answer» When there are little drops of water on TV or mobile screen why do we see colours like red blue green and violet in the droplets.

Discussion

33.	what is the behaviour of the capacitor and the solenoid whenever they are coonected to the electric source
Answer» what is the behaviour of the capacitor and the solenoid whenever they are coonected to the electric source

Discussion

34.	One end of an iron rod is placed in a fire where the temperature is 499∘C, and the other end is kept at a temperature of 25∘C. The rod is 1.2 m long and has an area of 5.0×10–3 m2. Ignoring the heat lost along the length of the rod, find the amount of heat conducted (in J) from one end of the rod to the other in 5.0 s. Take the coefficient of thermal conductivity of iron as 80 J/(s.m.C∘).
Answer» One end of an iron rod is placed in a fire where the temperature is $499^{\circ} C$ , and the other end is kept at a temperature of $25^{\circ} C$ . The rod is $1.2 m$ long and has an area of $5.0 \times 10^{- 3} m^{2}$ . Ignoring the heat lost along the length of the rod, find the amount of heat conducted (in $J$ ) from one end of the rod to the other in $5.0 s$ . Take the coefficient of thermal conductivity of iron as $80 J / ({s.m.C}^{\circ})$ .

Discussion

35.	The escape velocity from surface of earth 11.2km/s.the escape velocity from the surface of another planet of same mass and radius 1/4 times the radius of earth is
Answer» The escape velocity from surface of earth 11.2km/s.the escape velocity from the surface of another planet of same mass and radius 1/4 times the radius of earth is

Discussion

36.	A balance point is obtained on the potentiometer wire, if the fall of potential along the potentiometer wire due to driving cell is greater than the emf of the cell to be balanced. Explain
Answer» A balance point is obtained on the potentiometer wire, if the fall of potential along the potentiometer wire due to driving cell is greater than the emf of the cell to be balanced. Explain

Discussion

37.	A transformer is used to light a 140 W,24 V lamp from 240 V AC mains. The current in mains cable is 0.7 A, find the efficiency (approximate value) of transformer.
Answer» A transformer is used to light a $140 W, 24 V$ lamp from $240 V$ AC mains. The current in mains cable is $0.7 A$ , find the efficiency (approximate value) of transformer.

Discussion

38.	TO SEND 10% of main current through a moving coil galvanometer of resistance 99ohm,shunt required is
Answer» TO SEND 10% of main current through a moving coil galvanometer of resistance 99ohm,shunt required is

Discussion

39.	A carpenter, while driving a screw through a wooden block of thickness 1.5 cm notices that he has to rotate the screw 20 times for the purpose. Then the pitch of the screw is:
Answer» A carpenter, while driving a screw through a wooden block of thickness 1.5 cm notices that he has to rotate the screw 20 times for the purpose. Then the pitch of the screw is:

Discussion

40.	What is electron gain enthalphy
Answer» What is electron gain enthalphy

Discussion

41.	___ is a naturally occurring hydrocarbon gas mixture.
Answer» ___ is a naturally occurring hydrocarbon gas mixture.

Discussion

42.	What happens to light when it enters a rarer medium from a denser medium?
Answer» What happens to light when it enters a rarer medium from a denser medium?

Discussion

43.	A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X). (a) This device is a concave lens of focal length 8 cm. (b) This device is a convex mirror of focal length 8 cm. (c) This device is a convex lens of focal length 4 cm. (d) This device is a convex lens of focal length 8 cm.
Answer» A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X). (a) This device is a concave lens of focal length 8 cm. (b) This device is a convex mirror of focal length 8 cm. (c) This device is a convex lens of focal length 4 cm. (d) This device is a convex lens of focal length 8 cm.

Discussion

44.	How to find integration of mode x
Answer» How to find integration of mode x

Discussion

45.	A rectangular footing of plan dimensions 3m×4m rests at a depth of 1.8 m from the the surface of a sand deposit. The water table is at a depth of 8 m below the base of the footing. For dense sand, bulk unit weight is 19kN/m3 and bearing capacity factors are Nq=28 and Nγ=21. The net ultimate bearing capacity of the footing based on Terzaghi's bearing capacity equation is
Answer» A rectangular footing of plan dimensions $3 m \times 4 m$ rests at a depth of 1.8 m from the the surface of a sand deposit. The water table is at a depth of 8 m below the base of the footing. For dense sand, bulk unit weight is $19 k N / m^{3}$ and bearing capacity factors are $N_{q} = 28$ and $N_{γ} = 21$ . The net ultimate bearing capacity of the footing based on Terzaghi's bearing capacity equation is

Discussion

46.	What are non-renewable resources of energy? Give two examples of such resources.
Answer» What are non-renewable resources of energy? Give two examples of such resources.

Discussion

47.	Escape velocity of an atmospheric particle which us 1000km above the earths surface is
Answer» Escape velocity of an atmospheric particle which us 1000km above the earths surface is

Discussion

48.	An object 5 cm high is placed at a distance of 60 cm in front of a concave mirror of focal length 10 cm. Find (i) the position and (ii) size, of the image.
Answer» An object 5 cm high is placed at a distance of 60 cm in front of a concave mirror of focal length 10 cm. Find (i) the position and (ii) size, of the image.

Discussion

49.	Tests are performed on a 1- phase, 10 kVA, 2200/220 V, 60 Hz transformer and the following results are obtained.Open circuit -testshort circuit -test(HV side open)(LV side shorted)Voltmeter220 V150 VAmmeter2.5 A4.55 AWattmeter100 W215 WThe approximate equivalent circuit is :
Answer» Tests are performed on a 1- phase, 10 kVA, 2200/220 V, 60 Hz transformer and the following results are obtained. $\begin{matrix} Open circuit -test & short circuit -test (HV side open) & (LV side shorted) Voltmeter & 220 V & 150 V Ammeter & 2.5 A & 4.55 A Wattmeter & 100 W & 215 W \end{matrix}$ The approximate equivalent circuit is :

Discussion

50.	Which of the following expresses Charle's law?
Answer» Which of the following expresses Charle's law?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A solenoid of radius R and length L has a current I = I0 cosωt. The value of induced electric field at a distance of r outside the solenoid, is :

What is meant by moving coil galvanometer?

A particle moves at angle with the horizontal from ground . If slope of the trajectory of the particle is m . Then dm/dt as function of time can be represented as

The nucleus of a _______ atom (such as uranium, plutonium or thorium), when bombarded with__________ neutrons, can be split into lighter nuclei.

Name the person who is most remembered for the protection of Khejri trees in Rajasthan.

If a ray of light travels from water (μw) to air (μa). Find the critical angle?

Electronic controller produces an output of

Question 2Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.

If gravitational potential energy of earth and a block of mass m is taken zero at the surface then potential energy of this system at a height Re above the surface is-1.mgR/22.mgR 3.-mgR /24.-mgR

Question 3 The gravitational force between two objects is F. If masses of both objects are halved without changing distance between them, then the gravitational force would become (a) F4 (b) F2 (c) F (d) 2F

104. An electric iron draws a current of 1A when voltage is 100V. If voltage is now changed to 400V, will it make any difference to the current flowing?

2.Why the Charges are accumulated at the sharp edges of the Conductors??

Explain laws of reflection.

Two identical small conducting sphere are separated of 1m. The sphere originally the same positive charge and the force between them F^°. Half of the charge on one sphere is then moved to other sphere. The force between the sphere is now

25.When water is filled in a container to a height of 16 cm, it appears half filled when viewed from top. The height of the vessel is (refractive index of water 4/3) 1.10 cm 2.14 cm 3.28 cm 4.32 cm

An electric bulb draw a electric current 0.2A when voltage was 220 volt. Find the amount of electric charge flow in 1 hour

In the process of extraction of Cu,FeSi03 is produced as slag.Which of the below mentioned way can we handle it?

What are the two ways in which you can trace the magnetic field pattern of a bar magnet ?

18. a telescope has objective of focal length 200 cm and eye piece with f=2cm .if its used to see a 50 m tall building at a distance of 2km ,what is height of image of the building formed by objective lens ? 1.1ccm 2.10 cm 3.5 cm 4.2 cm

Calculate the current flowing through 1.5 kW-250 V electric heater and also find its resistance. [3 MARKS]

the frequency of an electromagnetic radiation whose wavelength is 5×10^{-2}nm i

A 35mm wide slide with a 24mm*36mm picture is projected on a screen placed 12cm from the slide. The image of slide picture on the screen measures 1.0m*1.5m. What is the linear magnification of the projector screen?

an electron is moving in circular path of radius 0.25 with time of 10^{-19} then find out the current flowing

Bring out the parallel suggested between the predatory instincts of the bird and human behaviour.

Which of the following mirror will always form virtual and diminished image irrespective of object location?

How much electrical energy flows through a wire in 1 second when the power is 1 kW?

A ray of light moving in air strikes at origin at { grazing angle and then follows a path 2y=x^2 for {x≥0 and y≥0. The correct variation of { refractive index with x co-crdinate is

B2is \lbrack where B is20. The dimensional formula ofmagnetic field, q charge, V electric potential andpermeability\rbrack(1) \lbrack MO L-3 TO(2) \lbrack ML-3 T(3) \lbrack MO L3 TO(4) \lbrack M L3 To\rbrack

what is the refractive index of gold

Question 1A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?

When there are little drops of water on TV or mobile screen why do we see colours like red blue green and violet in the droplets.

what is the behaviour of the capacitor and the solenoid whenever they are coonected to the electric source

The escape velocity from surface of earth 11.2km/s.the escape velocity from the surface of another planet of same mass and radius 1/4 times the radius of earth is

A balance point is obtained on the potentiometer wire, if the fall of potential along the potentiometer wire due to driving cell is greater than the emf of the cell to be balanced. Explain

A transformer is used to light a 140 W,24 V lamp from 240 V AC mains. The current in mains cable is 0.7 A, find the efficiency (approximate value) of transformer.

TO SEND 10% of main current through a moving coil galvanometer of resistance 99ohm,shunt required is

A carpenter, while driving a screw through a wooden block of thickness 1.5 cm notices that he has to rotate the screw 20 times for the purpose. Then the pitch of the screw is:

What is electron gain enthalphy

___ is a naturally occurring hydrocarbon gas mixture.

What happens to light when it enters a rarer medium from a denser medium?

How to find integration of mode x

What are non-renewable resources of energy? Give two examples of such resources.

Escape velocity of an atmospheric particle which us 1000km above the earths surface is

An object 5 cm high is placed at a distance of 60 cm in front of a concave mirror of focal length 10 cm. Find (i) the position and (ii) size, of the image.

Tests are performed on a 1- phase, 10 kVA, 2200/220 V, 60 Hz transformer and the following results are obtained.Open circuit -testshort circuit -test(HV side open)(LV side shorted)Voltmeter220 V150 VAmmeter2.5 A4.55 AWattmeter100 W215 WThe approximate equivalent circuit is :

Which of the following expresses Charle's law?

The nucleus of a _ atom (such as uranium, plutonium or thorium), when bombarded with____ neutrons, can be split into lighter nuclei.

A 35mm wide slide with a 24mm36mm picture is projected on a screen placed 12cm from the slide. The image of slide picture on the screen measures 1.0m1.5m. What is the linear magnification of the projector screen?