16569 + Interview Questions in Physics

1.	In which of the following statements is a net force of zero acting on the object in question? A. A car drives around a circular racetrack at a constant speed B. A person pushes on a door to hold it shut C. A ball, rolling across a grassy field, slowly comes to a stop
Answer» In which of the following statements is a net force of zero acting on the object in question? A. A car drives around a circular racetrack at a constant speed B. A person pushes on a door to hold it shut C. A ball, rolling across a grassy field, slowly comes to a stop

Discussion

2.	if for H_2 gas C_p-C_v =a and for O_2 gas C_p-C_v =b where C_p and C_v are heat capacity in cal/g-K then a) b=8a b) a=b c) a=16b d) a=4b
Answer» if for H_2 gas C_p-C_v =a and for O_2 gas C_p-C_v =b where C_p and C_v are heat capacity in cal/g-K then a) b=8a b) a=b c) a=16b d) a=4b

Discussion

3.	Why voltmeter is not connected in series.
Answer» Why voltmeter is not connected in series.

Discussion

4.	Which of the following best depicts the way we see objects?
Answer» Which of the following best depicts the way we see objects?

Discussion

5.	All fossil fuels are made up of compounds of carbon and hydrogen. Do you agree? Give reasons.
Answer» All fossil fuels are made up of compounds of carbon and hydrogen. Do you agree? Give reasons.

Discussion

6.	Noise pollution affects our health by causing which of the following?
Answer» Noise pollution affects our health by causing which of the following?

Discussion

7.	Question 3 An electric iron of resistance 20Ω takes a current of 5 A. Calculate the heat developed in 30 s.
Answer» Question 3 An electric iron of resistance $20 Ω$ takes a current of 5 A. Calculate the heat developed in 30 s.

Discussion

8.	Will the speed of light differ for solid ,liquid, gas
Answer» Will the speed of light differ for solid ,liquid, gas

Discussion

9.	For a certain organ pipe, three successiveresonance frequencies are observed at 425, 595,and 765, Hz respectively, Taking the speed ofsound in air to be 340 m/s the fundamentalfrequency of the pipe (in Hz) is(1) 425(3) 85(2) 170(4) 245
Answer» For a certain organ pipe, three successiveresonance frequencies are observed at 425, 595,and 765, Hz respectively, Taking the speed ofsound in air to be 340 m/s the fundamentalfrequency of the pipe (in Hz) is(1) 425(3) 85(2) 170(4) 245

Discussion

10.	ntA lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively-n ntn nta) f/2 and I/2n ntb) f and I/4n ntc) 3f/4 and I/2n ntd) f and 3I/4n ntPl. tell correct option and whyn ntn
Answer» ntA lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively-n ntn nta) f/2 and I/2n ntb) f and I/4n ntc) 3f/4 and I/2n ntd) f and 3I/4n ntPl. tell correct option and whyn ntn

Discussion

11.	Which of the following relations represent Ohm's law?
Answer» Which of the following relations represent Ohm's law?

Discussion

12.	When the light comes from infinite but not parallel to principal axis then where the image will be formed when passing through a concave lens?
Answer» When the light comes from infinite but not parallel to principal axis then where the image will be formed when passing through a concave lens?

Discussion

13.	Why an object submerged in water appears to be more closer than it's real depth ?
Answer» Why an object submerged in water appears to be more closer than it's real depth ?

Discussion

14.	A frontend loader did 1250 joules of work to lift a rock by applying 150 N force. How far was the rock lifted?
Answer» A frontend loader did 1250 joules of work to lift a rock by applying 150 N force. How far was the rock lifted?

Discussion

15.	A body of mass 5 kg is thrown vertically upwards so that it reaches a maximum height of 50 m in 20 seconds. Find the power required to throw the ball so that it reaches that height.(take g=10 ms−2)
Answer» A body of mass 5 kg is thrown vertically upwards so that it reaches a maximum height of 50 m in 20 seconds. Find the power required to throw the ball so that it reaches that height. $(t a k e g = 10 m s^{- 2})$

Discussion

16.	Three convex lenses of focal length f1 ,f2 and f3 are kept in contact coaxially .Find the focal length and power of the combination.
Answer» Three convex lenses of focal length f1 ,f2 and f3 are kept in contact coaxially .Find the focal length and power of the combination.

Discussion

17.	the separation between the plate of parallel plate capacitor is 1mm is connected in an electric circuit if rate of change of voltage between the plate is 10^8 v/s and the plate area is 30cm^2 then the value of displacement current between the plates will be
Answer» the separation between the plate of parallel plate capacitor is 1mm is connected in an electric circuit if rate of change of voltage between the plate is 10^8 v/s and the plate area is 30cm^2 then the value of displacement current between the plates will be

Discussion

18.	An astronomer has total weight of 80 kg. On reaching moon, he climbs up 10 m to enter his aircraft by the ladder. His gravitational potential energy is increased by 1000 J. The value of the gravitational acceleration on the moon is
Answer» An astronomer has total weight of 80 kg. On reaching moon, he climbs up 10 m to enter his aircraft by the ladder. His gravitational potential energy is increased by 1000 J. The value of the gravitational acceleration on the moon is

Discussion

19.	What are the role of live wire and neutral wire in domestic purpose
Answer» What are the role of live wire and neutral wire in domestic purpose

Discussion

20.	What is calorific value? What are non-renewable sources?
Answer» What is calorific value? What are non-renewable sources?

Discussion

21.	The potential energy of a hammer of mass 10 kg, lifted to the height of 10 m is
Answer» The potential energy of a hammer of mass 10 kg, lifted to the height of 10 m is

Discussion

22.	Choosing only words from the following list, write down the appropriate words to fill in the blanks (a) to (e) below: anions, anode, cathode, cations, electrode, electrolyte, nickel, voltameter.To electroplate an article with nickel requires an (a) ________ which must be a solution containing (b) ________ ions. The article to be plated is placed as the (c) _________ of the cell in which the plating is carried out. The (d) _________ of the cell is made from pure nickel. The ions that are attracted to the negative electrode and discharged are called (e) _________.
Answer» Choosing only words from the following list, write down the appropriate words to fill in the blanks (a) to (e) below: anions, anode, cathode, cations, electrode, electrolyte, nickel, voltameter. To electroplate an article with nickel requires an (a) ________ which must be a solution containing (b) ________ ions. The article to be plated is placed as the (c) _________ of the cell in which the plating is carried out. The (d) _________ of the cell is made from pure nickel. The ions that are attracted to the negative electrode and discharged are called (e) _________.

Discussion

23.	Hunds rule
Answer» Hunds rule

Discussion

24.	(a) Draw a labelled diagram showing how a plane mirror forms an image of a point object placed in front of it.(b) State the characteristics of the image formed in a plane mirror.
Answer» (a) Draw a labelled diagram showing how a plane mirror forms an image of a point object placed in front of it. (b) State the characteristics of the image formed in a plane mirror.

24.

(a) Draw a labelled diagram showing how a plane mirror forms an image of a point object placed in front of it.(b) State the characteristics of the image formed in a plane mirror.

Answer»

(a) Draw a labelled diagram showing how a plane mirror forms an image of a point object placed in front of it.

(b) State the characteristics of the image formed in a plane mirror.

Discussion

25.	A coil of 100 turns with a current of 5 A produced a magnetic flux of 1 μWb at each turn of the coil. The coefficient of self induction is-
Answer» A coil of $100$ turns with a current of $5 A$ produced a magnetic flux of $1 μ Wb$ at each turn of the coil. The coefficient of self induction is-

Discussion

26.	From a uniform disc of radius R and mass 9M, four small discs of radius R3 are removed as shown in figure. The moment of inertia of the remaining disc about an axis perpendicular to the plane and passing through the centre of the disc is nMR2. Then, n is
Answer» From a uniform disc of radius $R$ and mass $9 M$ , four small discs of radius $\frac{R}{3}$ are removed as shown in figure. The moment of inertia of the remaining disc about an axis perpendicular to the plane and passing through the centre of the disc is $n M R^{2}$ . Then, $n$ is

Discussion

27.	19.What is the formula of power
Answer» 19.What is the formula of power

Discussion

28.	Frequency of given AC signal is 50 Hz. When it is connected to a half wave rectifier, the number of the output pulses given by rectifier within one second is(a)50(b)100(c)25(d)150
Answer» Frequency of given AC signal is 50 Hz. When it is connected to a half wave rectifier, the number of the output pulses given by rectifier within one second is(a)50(b)100(c)25(d)150

Discussion

29.	14. Find the value of X if the net resistance between a and b is equal to 50ohm!
Answer» 14. Find the value of X if the net resistance between a and b is equal to 50ohm!

Discussion

30.	1 watt is defined as:
Answer» 1 watt is defined as:

Discussion

31.	A ray of light is incident on a parallel-sided glass slab as shown in the figure. The angle of refraction for this ray of light is likely to be:(1) 60°(2) 33°(3) 57°(4) 30°
Answer» A ray of light is incident on a parallel-sided glass slab as shown in the figure. The angle of refraction for this ray of light is likely to be: (1) 60° (2) 33° (3) 57° (4) 30°

Discussion

32.	A 4 A current carrying loop consists of three identical quarter of circle of radius 5 cm lying in the positive quadrant of x−y, y−z, z−x plane with their centres at origin. Joined together values of B at the origin due to these three arcs is
Answer» A $4 A$ current carrying loop consists of three identical quarter of circle of radius $5 cm$ lying in the positive quadrant of $x - y, y - z, z - x$ plane with their centres at origin. Joined together values of $B$ at the origin due to these three arcs is

Discussion

33.	Left half of semi-circular ring has uniform linear charge density –λ, while right half has +λ as shown. Direction of electric field at point O is alongदर्शाए अनुसार अर्द्ध-वृत्तीय वलय के बायें आधे भाग पर एकसमान रेखीय आवेश घनत्व –λ है, जबकि दायें आधे भाग पर एकसमान रेखीय आवेश घनत्व +λ है। बिन्दु O पर विद्युत क्षेत्र की दिशा किसके अनुदिश है?
Answer» Left half of semi-circular ring has uniform linear charge density –λ, while right half has +λ as shown. Direction of electric field at point O is along दर्शाए अनुसार अर्द्ध-वृत्तीय वलय के बायें आधे भाग पर एकसमान रेखीय आवेश घनत्व –λ है, जबकि दायें आधे भाग पर एकसमान रेखीय आवेश घनत्व +λ है। बिन्दु O पर विद्युत क्षेत्र की दिशा किसके अनुदिश है?

Discussion

34.	The gravitational force between two objects is F. If masses of both the objects are halved without altering the distance between them, then the gravitational force would become:
Answer» The gravitational force between two objects is F. If masses of both the objects are halved without altering the distance between them, then the gravitational force would become:

Discussion

35.	1.What is the relation between Instantaneous voltage and and root mean square voltage?2.What is the relation between Instantaneous voltage and average voltage?3.What is the relation between Instantaneous current and root mean square current? 4.What is the relation between Instantaneous current and average current?
Answer» 1.What is the relation between Instantaneous voltage and and root mean square voltage? 2.What is the relation between Instantaneous voltage and average voltage? 3.What is the relation between Instantaneous current and root mean square current? 4.What is the relation between Instantaneous current and average current?

Discussion

36.	The resultant resistance of n wires each of resistance r ohms is R, when they are connected in parallel. When these n resistances are connected in series, the resultant resistance will be :-
Answer» The resultant resistance of $n$ wires each of resistance $r ohms$ is $R$ , when they are connected in parallel. When these $n$ resistances are connected in series, the resultant resistance will be :-

Discussion

37.	Two satellites A and B of masses 200 kg and 400 kg are revolving round the earth at height of 600 km and 1600 km respectively. If TA and TB are the time periods of A and B respectively then the value of TB−TA is: [Given : Radius of earth=6400 km, Mass of earth=6×1024 kg]
Answer» Two satellites $A$ and $B$ of masses $200 kg$ and $400 kg$ are revolving round the earth at height of $600 km$ and $1600 km$ respectively. If $T_{A}$ and $T_{B}$ are the time periods of $A$ and $B$ respectively then the value of $T_{B} - T_{A}$ is: $[$ Given : Radius of earth $= 6400 km$ , Mass of earth $= 6 \times 10^{24} kg]$

Discussion

38.	A charged particle (q) is moving in a circle of radiusR with uniform speed v. The associated magneticmoment u is given by :(1) q v R(2) q v R/2(3) q v R2(4) qv R2/2
Answer» A charged particle (q) is moving in a circle of radiusR with uniform speed v. The associated magneticmoment u is given by :(1) q v R(2) q v R/2(3) q v R2(4) qv R2/2

Discussion

39.

Solve and fill in the blanks. Velocity in first medium (v1) Velocity in second medium (v2) Refractive index 1η2 Refractive index 2η1 3 × 108 m/s 1.2 × 108 m/s … … … 2.25 × 108 m/s 4/3 … 2 × 108 m/s … … 1.5

Answer»

Solve and fill in the blanks.

Velocity in first medium (v₁)	Velocity in second medium (v₂)	Refractive index ₁η₂	Refractive index ₂η₁
3 × 10⁸ m/s	1.2 × 10⁸ m/s	…	…
…	2.25 × 10⁸ m/s	4/3	…
2 × 10⁸ m/s	…	…	1.5

Discussion

40.	Propagation of sound can be visualized as
Answer» Propagation of sound can be visualized as

Discussion

41.	A point source of light is kept at a distance of 15 cm from a converging lens, on its optical axis. The focal length of the lens is 10 cm and its diameter of aperture is 3 cm. A screen is placed on the other side of the lens, perpendicular to the axis of the lens, at a distance 20 cm from it. Find the area of the illuminated part of the screen.
Answer» A point source of light is kept at a distance of 15 cm from a converging lens, on its optical axis. The focal length of the lens is 10 cm and its diameter of aperture is 3 cm. A screen is placed on the other side of the lens, perpendicular to the axis of the lens, at a distance 20 cm from it. Find the area of the illuminated part of the screen.

Discussion

42.	136. The magnitude of difference in accelerations of blocks of mass m in both the cases shown below is
Answer» 136. The magnitude of difference in accelerations of blocks of mass m in both the cases shown below is

Discussion

43.	a. What is CNG? b. What are the uses of CNG?
Answer» a. What is CNG? b. What are the uses of CNG?

43.

a. What is CNG? b. What are the uses of CNG?

Answer»

a. What is CNG?

b. What are the uses of CNG?

Discussion

44.	Refractive index of medium b with respect to medium a is 2. The refractive index of medium c with respect to b is 3. What is the refractive index of medium c with respect to a?
Answer» Refractive index of medium b with respect to medium a is 2. The refractive index of medium c with respect to b is 3. What is the refractive index of medium c with respect to a?

Discussion

45.	Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit A and B respectively. The current flowing in both the circuits is the same.Will the heat produced in both the cases be equal? Explain.
Answer» Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit A and B respectively. The current flowing in both the circuits is the same. Will the heat produced in both the cases be equal? Explain.

Discussion

46.	Comment on a few human activities which affects and destroys the environment.
Answer» Comment on a few human activities which affects and destroys the environment.

Discussion

47.	In non stoichiometric defect due to anionic vacanies from where the electron has come to maintain electrical neutrality
Answer» In non stoichiometric defect due to anionic vacanies from where the electron has come to maintain electrical neutrality

Discussion

48.	The ___ is the scattering of light as a light beam passes through a colloid.
Answer» The ___ is the scattering of light as a light beam passes through a colloid.

Discussion

49.	Answer the following(1) State the different positions of source of light with respect to concave mirror−(a) in torches(b) projector lamps(c) food lights.(2) What are the rules used for drawing ray diagrams for the formation of image by spherical mirror?(3) What is meant by power of accommodation of eye?(4) State the function of iris and ciliary muscles in human eye.(5) If you are given a part of hollow spherical glass, how will you convert it into concave mirror?
Answer» Answer the following (1) State the different positions of source of light with respect to concave mirror− (a) in torches (b) projector lamps (c) food lights. (2) What are the rules used for drawing ray diagrams for the formation of image by spherical mirror? (3) What is meant by power of accommodation of eye? (4) State the function of iris and ciliary muscles in human eye. (5) If you are given a part of hollow spherical glass, how will you convert it into concave mirror?

49.

Answer the following(1) State the different positions of source of light with respect to concave mirror−(a) in torches(b) projector lamps(c) food lights.(2) What are the rules used for drawing ray diagrams for the formation of image by spherical mirror?(3) What is meant by power of accommodation of eye?(4) State the function of iris and ciliary muscles in human eye.(5) If you are given a part of hollow spherical glass, how will you convert it into concave mirror?

Answer»

Answer the following

(1) State the different positions of source of light with respect to concave mirror−

(a) in torches

(b) projector lamps

(c) food lights.

(2) What are the rules used for drawing ray diagrams for the formation of image by spherical mirror?

(3) What is meant by power of accommodation of eye?

(4) State the function of iris and ciliary muscles in human eye.

(5) If you are given a part of hollow spherical glass, how will you convert it into concave mirror?

Discussion

50.	what is minimum possible atomic number of element containing 4 electron in ground state with magnetic momentum quantum number ml = +1
Answer» what is minimum possible atomic number of element containing 4 electron in ground state with magnetic momentum quantum number ml = +1

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In which of the following statements is a net force of zero acting on the object in question? A. A car drives around a circular racetrack at a constant speed B. A person pushes on a door to hold it shut C. A ball, rolling across a grassy field, slowly comes to a stop

if for H_2 gas C_p-C_v =a and for O_2 gas C_p-C_v =b where C_p and C_v are heat capacity in cal/g-K then a) b=8a b) a=b c) a=16b d) a=4b

Why voltmeter is not connected in series.

Which of the following best depicts the way we see objects?

All fossil fuels are made up of compounds of carbon and hydrogen. Do you agree? Give reasons.

Noise pollution affects our health by causing which of the following?​

Question 3 An electric iron of resistance 20Ω takes a current of 5 A. Calculate the heat developed in 30 s.

Will the speed of light differ for solid ,liquid, gas

For a certain organ pipe, three successiveresonance frequencies are observed at 425, 595,and 765, Hz respectively, Taking the speed ofsound in air to be 340 m/s the fundamentalfrequency of the pipe (in Hz) is(1) 425(3) 85(2) 170(4) 245

Which of the following relations represent Ohm's law?

When the light comes from infinite but not parallel to principal axis then where the image will be formed when passing through a concave lens?

Why an object submerged in water appears to be more closer than it's real depth ?

A frontend loader did 1250 joules of work to lift a rock by applying 150 N force. How far was the rock lifted?

A body of mass 5 kg is thrown vertically upwards so that it reaches a maximum height of 50 m in 20 seconds. Find the power required to throw the ball so that it reaches that height.(take g=10 ms−2)

Three convex lenses of focal length f1 ,f2 and f3 are kept in contact coaxially .Find the focal length and power of the combination.

the separation between the plate of parallel plate capacitor is 1mm is connected in an electric circuit if rate of change of voltage between the plate is 10^8 v/s and the plate area is 30cm^2 then the value of displacement current between the plates will be

An astronomer has total weight of 80 kg. On reaching moon, he climbs up 10 m to enter his aircraft by the ladder. His gravitational potential energy is increased by 1000 J. The value of the gravitational acceleration on the moon is

What are the role of live wire and neutral wire in domestic purpose

What is calorific value? What are non-renewable sources?

The potential energy of a hammer of mass 10 kg, lifted to the height of 10 m is

Hunds rule

(a) Draw a labelled diagram showing how a plane mirror forms an image of a point object placed in front of it.(b) State the characteristics of the image formed in a plane mirror.

A coil of 100 turns with a current of 5 A produced a magnetic flux of 1 μWb at each turn of the coil. The coefficient of self induction is-

From a uniform disc of radius R and mass 9M, four small discs of radius R3 are removed as shown in figure. The moment of inertia of the remaining disc about an axis perpendicular to the plane and passing through the centre of the disc is nMR2. Then, n is

19.What is the formula of power

Frequency of given AC signal is 50 Hz. When it is connected to a half wave rectifier, the number of the output pulses given by rectifier within one second is(a)50(b)100(c)25(d)150

14. Find the value of X if the net resistance between a and b is equal to 50ohm!

1 watt is defined as:

A ray of light is incident on a parallel-sided glass slab as shown in the figure. The angle of refraction for this ray of light is likely to be:(1) 60°(2) 33°(3) 57°(4) 30°

A 4 A current carrying loop consists of three identical quarter of circle of radius 5 cm lying in the positive quadrant of x−y, y−z, z−x plane with their centres at origin. Joined together values of B at the origin due to these three arcs is

The gravitational force between two objects is F. If masses of both the objects are halved without altering the distance between them, then the gravitational force would become:

The resultant resistance of n wires each of resistance r ohms is R, when they are connected in parallel. When these n resistances are connected in series, the resultant resistance will be :-

Two satellites A and B of masses 200 kg and 400 kg are revolving round the earth at height of 600 km and 1600 km respectively. If TA and TB are the time periods of A and B respectively then the value of TB−TA is: [Given : Radius of earth=6400 km, Mass of earth=6×1024 kg]

A charged particle (q) is moving in a circle of radiusR with uniform speed v. The associated magneticmoment u is given by :(1) q v R(2) q v R/2(3) q v R2(4) qv R2/2

Solve and fill in the blanks. Velocity in first medium (v1) Velocity in second medium (v2) Refractive index 1η2 Refractive index 2η1 3 × 108 m/s 1.2 × 108 m/s … … … 2.25 × 108 m/s 4/3 … 2 × 108 m/s … … 1.5

Propagation of sound can be visualized as

136. The magnitude of difference in accelerations of blocks of mass m in both the cases shown below is

a. What is CNG? b. What are the uses of CNG?

Refractive index of medium b with respect to medium a is 2. The refractive index of medium c with respect to b is 3. What is the refractive index of medium c with respect to a?

Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit A and B respectively. The current flowing in both the circuits is the same.Will the heat produced in both the cases be equal? Explain.

Comment on a few human activities which affects and destroys the environment.

In non stoichiometric defect due to anionic vacanies from where the electron has come to maintain electrical neutrality

The ___ is the scattering of light as a light beam passes through a colloid.

what is minimum possible atomic number of element containing 4 electron in ground state with magnetic momentum quantum number ml = +1

Noise pollution affects our health by causing which of the following?