16569 + Interview Questions in Physics

1.	The frequency of a radar is 780MHz. The frequency of the reflected wave from a plane is increased by 2.6KHz. The velocity of plane is___________
Answer» The frequency of a radar is 780MHz. The frequency of the reflected wave from a plane is increased by 2.6KHz. The velocity of plane is___________

Discussion

2.	(a) What are Becquerel rays? (b) Give four properties of Becquerel rays. [5 MARKS]
Answer» (a) What are Becquerel rays? (b) Give four properties of Becquerel rays. [5 MARKS]

Discussion

3.	A cell of emf E has an internal resistance r and is connected to rheostat. When resistance R of rheostat is changed, correct graph of potential differnce across it is
Answer» A cell of emf $E$ has an internal resistance $r$ and is connected to rheostat. When resistance $R$ of rheostat is changed, correct graph of potential differnce across it is

Discussion

4.	Derive equation for potential energy. [3 MARKS]
Answer» Derive equation for potential energy. [3 MARKS]

Discussion

5.	Solve the following examples.a. If the speed of light in a medium is 1.5 × 108 m/s, what is the absolute refractive index of the medium?b. If the absolute refractive indices of glass and water are 3/2 and 4/3 respectively, what is the refractive index of glass with respect to water?
Answer» Solve the following examples. a. If the speed of light in a medium is 1.5 × 10⁸ m/s, what is the absolute refractive index of the medium? b. If the absolute refractive indices of glass and water are 3/2 and 4/3 respectively, what is the refractive index of glass with respect to water?

Discussion

6.	A beam of protons with a velocity of 4×105 m/s enters a uniform magnetic field of B=0.3 T.The velocity makes an angle of 60∘ with the magnetic field. Find the pitch of the helix.(mass of proton mp=1.67×10−27 kg)
Answer» A beam of protons with a velocity of $4 \times 10^{5} m/s$ enters a uniform magnetic field of $B = 0.3 T .$ The velocity makes an angle of $60^{\circ}$ with the magnetic field. Find the pitch of the helix. (mass of proton $m_{p} = 1.67 \times 10^{- 27} kg$ )

Discussion

7.	Question 27How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?
Answer» Question 27 How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?

Discussion

8.	The force required to open a nut using a spanner of length 90 cm is 50 N. Calculate the force required if the spanner is 50 cm long.
Answer» The force required to open a nut using a spanner of length 90 cm is 50 N. Calculate the force required if the spanner is 50 cm long.

Discussion

9.	Three identical rods each of mass M, length1 are joined to form an equilateral ABC. Findthe MOI about BC as shown-2(A)2 Mc23(B) Me(D) none
Answer» Three identical rods each of mass M, length1 are joined to form an equilateral ABC. Findthe MOI about BC as shown-2(A)2 Mc23(B) Me(D) none

Discussion

10.	(4) AA tuning fork of frequency 512 Hz makes 4 beatsper second with the vibrating string of a piano. Thebeat frequency decreases to 2 beats per sec whenthe tension in the piano string is slightly increasedThe frequency of the piano string before increasingthe tension was \lbrack AIPMT (Prelims)-2010\rbrack SI(2) 510 Hz(4) 516 Hz(1) 508 Hz(3) 514 Hz
Answer» (4) AA tuning fork of frequency 512 Hz makes 4 beatsper second with the vibrating string of a piano. Thebeat frequency decreases to 2 beats per sec whenthe tension in the piano string is slightly increasedThe frequency of the piano string before increasingthe tension was \lbrack AIPMT (Prelims)-2010\rbrack SI(2) 510 Hz(4) 516 Hz(1) 508 Hz(3) 514 Hz

Discussion

11.	Find θ if the light is falling on the pole?
Answer» Find $θ$ if the light is falling on the pole?

11.

Find θ if the light is falling on the pole?

Answer»

Find $θ$ if the light is falling on the pole?

Discussion

12.	Q 1/25 The force of repulsion between two point chargesis F, when they are d distance apart. If the pointcharges are replaced by conducting spheres each of radius rand the charges remain same. The separation between thecentre of sphere is d, then force of repulsion between themisIS
Answer» Q 1/25 The force of repulsion between two point chargesis F, when they are d distance apart. If the pointcharges are replaced by conducting spheres each of radius rand the charges remain same. The separation between thecentre of sphere is d, then force of repulsion between themisIS

Discussion

13.	two bulbs 60W and 100W rated 110 V are connected in series to voltage of 220V find thenexplain when to use P=V^2/R and P=I^2R
Answer» two bulbs 60W and 100W rated 110 V are connected in series to voltage of 220V find then explain when to use P=V^2/R and P=I^2R

Discussion

14.	To move a table with a constant velocity, a force of 300 N is required. What is the friction force that will be exerted on the table? (Please specify the answer in N)
Answer» To move a table with a constant velocity, a force of 300 N is required. What is the friction force that will be exerted on the table? (Please specify the answer in N)

Discussion

15.	Strong force is actually nuclear force but what the weak force actually is?
Answer» Strong force is actually nuclear force but what the weak force actually is?

Discussion

16.	A small ball has charge q is 1/7×10^-17 no. Of electrons removed from ot
Answer» A small ball has charge q is 1/7×10^-17 no. Of electrons removed from ot

Discussion

17.	A metal rod PQ of length l slides with a velocity v on two parallel rails AB and CD parallel to a long straight wire XY carrying a current I as shown in the figure. A resistance R is connected between the rails as shown. The velocity of rod PQ is kept constant by applying force. Find the current induced in resistance R.
Answer» A metal rod $PQ$ of length $l$ slides with a velocity $v$ on two parallel rails $AB$ and $CD$ parallel to a long straight wire $XY$ carrying a current $I$ as shown in the figure. A resistance $R$ is connected between the rails as shown. The velocity of rod $PQ$ is kept constant by applying force. Find the current induced in resistance $R .$

Discussion

18.	5. The focal length of the objective and eye lens of a telescope are respectively 200 cm and 5 cm. The maximum magnifying power of the telescope will be
Answer» 5. The focal length of the objective and eye lens of a telescope are respectively 200 cm and 5 cm. The maximum magnifying power of the telescope will be

Discussion

19.	How does the mirror usually pass its time?
Answer» How does the mirror usually pass its time?

Discussion

20.	Given below is a diagram showing a defect of human eye.Study it and answer the following questions:(1) Name the defect shown in figure.(2) Give two possible reasons for this defect of eye in human being.(3) Name the type of lens used to correct the eye defect.(4) Draw a labelled diagram to show how the defect is rectified by using the lens.
Answer» Given below is a diagram showing a defect of human eye. Study it and answer the following questions: (1) Name the defect shown in figure. (2) Give two possible reasons for this defect of eye in human being. (3) Name the type of lens used to correct the eye defect. (4) Draw a labelled diagram to show how the defect is rectified by using the lens.

20.

Given below is a diagram showing a defect of human eye.Study it and answer the following questions:(1) Name the defect shown in figure.(2) Give two possible reasons for this defect of eye in human being.(3) Name the type of lens used to correct the eye defect.(4) Draw a labelled diagram to show how the defect is rectified by using the lens.

Answer»

Given below is a diagram showing a defect of human eye.

Study it and answer the following questions:

(1) Name the defect shown in figure.

(2) Give two possible reasons for this defect of eye in human being.

(3) Name the type of lens used to correct the eye defect.

(4) Draw a labelled diagram to show how the defect is rectified by using the lens.

Discussion

21.	Plane microwaves are incident on a long slit having a width of 5.0 cm. Calculate the wavelength of the microwaves if the first diffraction minimum is formed at θ=30∘.
Answer» Plane microwaves are incident on a long slit having a width of $5.0 cm$ . Calculate the wavelength of the microwaves if the first diffraction minimum is formed at $θ = 30^{\circ}$ .

Discussion

22.	Analyse the following pattern of the magnetic lines of force around the bar magnet and list the incorrect representation(s) in it.
Answer» Analyse the following pattern of the magnetic lines of force around the bar magnet and list the incorrect representation(s) in it.

Discussion

23.	Question geeta planned to floor her living room etc doubt In the solution why it is given 520×300/20×20 why 20×20
Answer» Question geeta planned to floor her living room etc doubt In the solution why it is given 520×300/20×20 why 20×20

Discussion

24.	What is the use of C frame?
Answer» What is the use of C frame?

Discussion

25.	A student is performing an experiment to verify Ohm's Law in the laboratory. The ammeter given to him for this purpose has 10 divisions between 0 and 0.5 A on its scale. If the pointer shows 22 divisions on the ammeter scale while taking a reading, what is the value of current according to this position of pointer?
Answer» A student is performing an experiment to verify Ohm's Law in the laboratory. The ammeter given to him for this purpose has 10 divisions between 0 and 0.5 A on its scale. If the pointer shows 22 divisions on the ammeter scale while taking a reading, what is the value of current according to this position of pointer?

Discussion

26.	When forward bias is applied to a p-n junction, then what happens to the potential barrier VB, and the width of charge depletion region?
Answer» When forward bias is applied to a p-n junction, then what happens to the potential barrier $V_{B}$ , and the width of charge depletion region?

Discussion

27.	Q84. Which of the following pollutants are considered for Ambient Air Quality Standards but not for National Air Quality Index? 1. Benzene 2. Arsenic 3. Nickel 4. Lead Select the correct answer using the code given below.
Answer» Q84. Which of the following pollutants are considered for Ambient Air Quality Standards but not for National Air Quality Index? 1. Benzene 2. Arsenic 3. Nickel 4. Lead Select the correct answer using the code given below.

27.

Q84. Which of the following pollutants are considered for Ambient Air Quality Standards but not for National Air Quality Index? 1. Benzene 2. Arsenic 3. Nickel 4. Lead Select the correct answer using the code given below.

Answer»

Q84. Which of the following pollutants are considered for Ambient Air Quality Standards but not for National Air Quality Index?

1. Benzene 2. Arsenic

3. Nickel 4. Lead

Select the correct answer using the code given below.

Discussion

28.	In a transistor, β=62 and resistance on the output side is R=5000 Ω. If the internal resistance of the transistor is 500 Ω, its power amplification will be
Answer» In a transistor, $β = 62$ and resistance on the output side is $R = 5000 Ω$ . If the internal resistance of the transistor is $500 Ω$ , its power amplification will be

Discussion

29.	Give reason In railway tracks the rails are supported by broad wooden plank.
Answer» Give reason In railway tracks the rails are supported by broad wooden plank.

Discussion

30.	A student sitting on the last bench in the class cannot read the writing on the blackboard clearly but he can read the book lying on his desk clearly. Which of the following statement is correct about the student ? (a) The near point of his eyes has receded away. (b) The near point of his eyes has come closer to him. (c) The far point of his eyes has receded away. (d) The far point of his eyes has come closer to him.
Answer» A student sitting on the last bench in the class cannot read the writing on the blackboard clearly but he can read the book lying on his desk clearly. Which of the following statement is correct about the student ? (a) The near point of his eyes has receded away. (b) The near point of his eyes has come closer to him. (c) The far point of his eyes has receded away. (d) The far point of his eyes has come closer to him.

Discussion

31.	There is a square plot with side length equal to 13m. A farmer wanted to grow grass on half of his field and plough the remaining land. Find the area of land used to grow the grass.
Answer» There is a square plot with side length equal to $13 m$ . A farmer wanted to grow grass on half of his field and plough the remaining land. Find the area of land used to grow the grass.

Discussion

32.	An experiment is performed to determine V-I characteristic of a zener diode, which has a protective resistance of 100 ohm and a maximum power of dissipation rating of 1W. The minimum voltage range of DC source in the circuit is?
Answer» An experiment is performed to determine V-I characteristic of a zener diode, which has a protective resistance of 100 ohm and a maximum power of dissipation rating of 1W. The minimum voltage range of DC source in the circuit is?

Discussion

33.	51. A photon of wavelength 300 mm is absorbed by a gas and then Limited as two photons on photo only is rate with Lambda is equal to 760 NM the wave number of second Putin will be
Answer» 51. A photon of wavelength 300 mm is absorbed by a gas and then Limited as two photons on photo only is rate with Lambda is equal to 760 NM the wave number of second Putin will be

Discussion

34.	Which is the transparent front part of the human eye?
Answer» Which is the transparent front part of the human eye?

Discussion

35.	Write short notes.a. Environmental Conservation.b. Chipko Movement of Bishnoi.c. Biodiversity.d. Sacred Groves.e. Disaster and its management.
Answer» Write short notes. a. Environmental Conservation. b. Chipko Movement of Bishnoi. c. Biodiversity. d. Sacred Groves. e. Disaster and its management.

Discussion

36.	Gravitational potential difference between a point on the surface of a planet and point 10 m above is 4J/kgConsidering the gravitational field to be uniform, how much work is done in moving a mass of 2 kg from the surface to a point 5 m above the surface?
Answer» Gravitational potential difference between a point on the surface of a planet and point 10 m above is 4J/kgConsidering the gravitational field to be uniform, how much work is done in moving a mass of 2 kg from the surface to a point 5 m above the surface?

Discussion

37.	37. A solid cylinder rolls down an inclined plane .It's mass is 2kg and radius 0.1m . If the height of the inclined plane is 4m what is the rotational kinetic energy when it reaches the foot of the plane?
Answer» 37. A solid cylinder rolls down an inclined plane .It's mass is 2kg and radius 0.1m . If the height of the inclined plane is 4m what is the rotational kinetic energy when it reaches the foot of the plane?

Discussion

38.	A vertical photograph was taken at an altitude of 1800 m above MSL. If the focal length of the camera is 30 cm, then the scale of the photograph for a terrain lying at an elevation of 800 m is 1:________3333.33
Answer» A vertical photograph was taken at an altitude of 1800 m above MSL. If the focal length of the camera is 30 cm, then the scale of the photograph for a terrain lying at an elevation of 800 m is 1:________ 3333.33

Discussion

39.	Which element is used in making solar cells?
Answer» Which element is used in making solar cells?

Discussion

40.	The following figure shows the symbols for components used in the accompanying electrical circuit. Place them at proper places and complete the circuit.Which law can you prove with the help of the above circuit?
Answer» The following figure shows the symbols for components used in the accompanying electrical circuit. Place them at proper places and complete the circuit. Which law can you prove with the help of the above circuit?

Discussion

41.	is the most potent greenhouse gas
Answer» is the most potent greenhouse gas

Discussion

42.	What is buyont force
Answer» What is buyont force

Discussion

43.	Draw a ray diagram for a compound microscope in normal adjustment and least distance of distinct vision
Answer» Draw a ray diagram for a compound microscope in normal adjustment and least distance of distinct vision

Discussion

44.	If the speed of a body is 5 m/s. Find the time it would take to cover a distance of 6 km.
Answer» If the speed of a body is 5 m/s. Find the time it would take to cover a distance of 6 km.

Discussion

45.	A wave source produces 20 crests and 20 troughs in 0.2 sec. Find the frequency of the wave.
Answer» A wave source produces $20$ crests and $20$ troughs in $0.2$ sec. Find the frequency of the wave.

Discussion

46.	When a person with myopia, hypermopia, and a normal person jump into the water to find a diamond ring, why does a person with mypoia find the ring easiest?
Answer» When a person with myopia, hypermopia, and a normal person jump into the water to find a diamond ring, why does a person with mypoia find the ring easiest?

Discussion

47.	the Ni(CO)_{4_{}} complex is diamagnetic in nature. the hybrid state of Ni is 1)sp^3 2)sp^{2 }d 3)sp^3d 4)spd^3
Answer» the Ni(CO)_{4_{}} complex is diamagnetic in nature. the hybrid state of Ni is 1)sp^3 2)sp^{2 }d 3)sp^3d 4)spd^3

Discussion

48.	a ray of light falls on the surface of a spherical glass paper weight making an angle α with the normal and is refracted in the medium at an angle β.the angle of deviation of the emergent ray from the direction of the incident ray is
Answer» a ray of light falls on the surface of a spherical glass paper weight making an angle α with the normal and is refracted in the medium at an angle β.the angle of deviation of the emergent ray from the direction of the incident ray is

Discussion

49.	An electron flies into a homogeneous magnetic field perpendicular to the field lines. The velocity of the electron is v=4×107 m/s. The induction of the field is 10−3 T. The acceleration of the electron in the magnetic field is approximately -
Answer» An electron flies into a homogeneous magnetic field perpendicular to the field lines. The velocity of the electron is $v = 4 \times 10^{7} m/s$ . The induction of the field is $10^{- 3} T$ . The acceleration of the electron in the magnetic field is approximately -

Discussion

50.	Why do we connect our appliances at home in parallel?
Answer» Why do we connect our appliances at home in parallel?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The frequency of a radar is 780MHz. The frequency of the reflected wave from a plane is increased by 2.6KHz. The velocity of plane is___________

(a) What are Becquerel rays? (b) Give four properties of Becquerel rays. [5 MARKS]

A cell of emf E has an internal resistance r and is connected to rheostat. When resistance R of rheostat is changed, correct graph of potential differnce across it is

Derive equation for potential energy. [3 MARKS]

Solve the following examples.a. If the speed of light in a medium is 1.5 × 108 m/s, what is the absolute refractive index of the medium?b. If the absolute refractive indices of glass and water are 3/2 and 4/3 respectively, what is the refractive index of glass with respect to water?

A beam of protons with a velocity of 4×105 m/s enters a uniform magnetic field of B=0.3 T.The velocity makes an angle of 60∘ with the magnetic field. Find the pitch of the helix.(mass of proton mp=1.67×10−27 kg)

Question 27How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?

The force required to open a nut using a spanner of length 90 cm is 50 N. Calculate the force required if the spanner is 50 cm long.

Three identical rods each of mass M, length1 are joined to form an equilateral ABC. Findthe MOI about BC as shown-2(A)2 Mc23(B) Me(D) none

Find θ if the light is falling on the pole?

Q 1/25 The force of repulsion between two point chargesis F, when they are d distance apart. If the pointcharges are replaced by conducting spheres each of radius rand the charges remain same. The separation between thecentre of sphere is d, then force of repulsion between themisIS

two bulbs 60W and 100W rated 110 V are connected in series to voltage of 220V find thenexplain when to use P=V^2/R and P=I^2R

To move a table with a constant velocity, a force of 300 N is required. What is the friction force that will be exerted on the table? (Please specify the answer in N)

Strong force is actually nuclear force but what the weak force actually is?

A small ball has charge q is 1/7×10^-17 no. Of electrons removed from ot

5. The focal length of the objective and eye lens of a telescope are respectively 200 cm and 5 cm. The maximum magnifying power of the telescope will be

How does the mirror usually pass its time?

Plane microwaves are incident on a long slit having a width of 5.0 cm. Calculate the wavelength of the microwaves if the first diffraction minimum is formed at θ=30∘.

Analyse the following pattern of the magnetic lines of force around the bar magnet and list the incorrect representation(s) in it.

Question geeta planned to floor her living room etc doubt In the solution why it is given 520×300/20×20 why 20×20

What is the use of C frame?

When forward bias is applied to a p-n junction, then what happens to the potential barrier VB, and the width of charge depletion region?

Q84. Which of the following pollutants are considered for Ambient Air Quality Standards but not for National Air Quality Index? 1. Benzene 2. Arsenic 3. Nickel 4. Lead Select the correct answer using the code given below.

In a transistor, β=62 and resistance on the output side is R=5000 Ω. If the internal resistance of the transistor is 500 Ω, its power amplification will be

Give reason In railway tracks the rails are supported by broad wooden plank.

There is a square plot with side length equal to 13m. A farmer wanted to grow grass on half of his field and plough the remaining land. Find the area of land used to grow the grass.

An experiment is performed to determine V-I characteristic of a zener diode, which has a protective resistance of 100 ohm and a maximum power of dissipation rating of 1W. The minimum voltage range of DC source in the circuit is?

51. A photon of wavelength 300 mm is absorbed by a gas and then Limited as two photons on photo only is rate with Lambda is equal to 760 NM the wave number of second Putin will be

Which is the transparent front part of the human eye?

Write short notes.a. Environmental Conservation.b. Chipko Movement of Bishnoi.c. Biodiversity.d. Sacred Groves.e. Disaster and its management.

Gravitational potential difference between a point on the surface of a planet and point 10 m above is 4J/kgConsidering the gravitational field to be uniform, how much work is done in moving a mass of 2 kg from the surface to a point 5 m above the surface?

37. A solid cylinder rolls down an inclined plane .It's mass is 2kg and radius 0.1m . If the height of the inclined plane is 4m what is the rotational kinetic energy when it reaches the foot of the plane?

A vertical photograph was taken at an altitude of 1800 m above MSL. If the focal length of the camera is 30 cm, then the scale of the photograph for a terrain lying at an elevation of 800 m is 1:________3333.33

Which element is used in making solar cells?

The following figure shows the symbols for components used in the accompanying electrical circuit. Place them at proper places and complete the circuit.Which law can you prove with the help of the above circuit?

is the most potent greenhouse gas

What is buyont force

Draw a ray diagram for a compound microscope in normal adjustment and least distance of distinct vision

If the speed of a body is 5 m/s. Find the time it would take to cover a distance of 6 km.

A wave source produces 20 crests and 20 troughs in 0.2 sec. Find the frequency of the wave.

When a person with myopia, hypermopia, and a normal person jump into the water to find a diamond ring, why does a person with mypoia find the ring easiest?

the Ni(CO)_{4_{}} complex is diamagnetic in nature. the hybrid state of Ni is 1)sp^3 2)sp^{2 }d 3)sp^3d 4)spd^3

a ray of light falls on the surface of a spherical glass paper weight making an angle α with the normal and is refracted in the medium at an angle β.the angle of deviation of the emergent ray from the direction of the incident ray is

An electron flies into a homogeneous magnetic field perpendicular to the field lines. The velocity of the electron is v=4×107 m/s. The induction of the field is 10−3 T. The acceleration of the electron in the magnetic field is approximately -

Why do we connect our appliances at home in parallel?