16569 + Interview Questions in Physics

1.	13.Two wires A and B are of equal length and have equal resistance .If the resistivity of A is more than that of B Which wire is thicker and why?
Answer» 13.Two wires A and B are of equal length and have equal resistance .If the resistivity of A is more than that of B Which wire is thicker and why?

Discussion

2.	Question 3Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?
Answer» Question 3 Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?

Discussion

3.	Name two appliances in which an electric motor is used.
Answer» Name two appliances in which an electric motor is used.

Discussion

4.	A closed organ pipe has lenght l .The air in it is vibrating in 3rd overtone with maximum amplitude a .The amplitude at a dis†an ce of l/7 from closed end of the pe is equal to
Answer» A closed organ pipe has lenght l .The air in it is vibrating in 3rd overtone with maximum amplitude a .The amplitude at a dis†an ce of l/7 from closed end of the pe is equal to

Discussion

5.	The number of turns in primary and secondary coils of an ideal transformer is 50 and 200 respectively. If the current in the primary coil is 4 A. The current in the secondary coil is-
Answer» The number of turns in primary and secondary coils of an ideal transformer is $50$ and $200$ respectively. If the current in the primary coil is $4 A .$ The current in the secondary coil is-

Discussion

6.	Speed of a planet in an elliptical orbit with semi major axis 'a' about sun of mass M at a distance r from sun is
Answer» Speed of a planet in an elliptical orbit with semi major axis 'a' about sun of mass M at a distance r from sun is

Discussion

7.	Mention a few applications of spherical mirrors.
Answer» Mention a few applications of spherical mirrors.

Discussion

8.	A uniform ring of radius R is moving in a horizontal surface with speed V and then climbs upa ramps of inclination 30^° to height H. There is no shipping in entire motion then find the value of H ?
Answer» A uniform ring of radius R is moving in a horizontal surface with speed V and then climbs upa ramps of inclination 30^° to height H. There is no shipping in entire motion then find the value of H ?

Discussion

9.	Fig. 9.12 shows three bulbs A, B and C each of rating 100 W, 220 V connected to the mains of 220 V. Answer the following: (a) How is the bulb A connected with the mains? At what voltage does it glow? (b) How are the bulbs B and C connected with the mains? At what voltage does the bulb B glow? (c) How is the glow of bulbs A and C affected if bulb B gets fused? (d) How is the glow of bulbs B and C affected if bulb A gets fused?
Answer» Fig. 9.12 shows three bulbs A, B and C each of rating 100 W, 220 V connected to the mains of 220 V. Answer the following: (a) How is the bulb A connected with the mains? At what voltage does it glow? (b) How are the bulbs B and C connected with the mains? At what voltage does the bulb B glow? (c) How is the glow of bulbs A and C affected if bulb B gets fused? (d) How is the glow of bulbs B and C affected if bulb A gets fused?

9.

Fig. 9.12 shows three bulbs A, B and C each of rating 100 W, 220 V connected to the mains of 220 V. Answer the following: (a) How is the bulb A connected with the mains? At what voltage does it glow? (b) How are the bulbs B and C connected with the mains? At what voltage does the bulb B glow? (c) How is the glow of bulbs A and C affected if bulb B gets fused? (d) How is the glow of bulbs B and C affected if bulb A gets fused?

Answer»

Fig. 9.12 shows three bulbs A, B and C each of rating 100 W, 220 V connected to the mains of 220 V. Answer the following:

(a) How is the bulb A connected with the mains? At what voltage does it glow?

(b) How are the bulbs B and C connected with the mains? At what voltage does the bulb B glow?

(c) How is the glow of bulbs A and C affected if bulb B gets fused?

(d) How is the glow of bulbs B and C affected if bulb A gets fused?

Discussion

10.	Why does a pencil partly immersed in water appears to be bent inside the water?
Answer» Why does a pencil partly immersed in water appears to be bent inside the water?

Discussion

11.	On adding the number of protons and the number of neutrons in the nucleus of an atom, Sam got the ___ of the considered element.
Answer» On adding the number of protons and the number of neutrons in the nucleus of an atom, Sam got the ___ of the considered element.

Discussion

12.	A projectile is fired with a speed u at an angle theta above a horizontal field. The coefficient of restitution of collision between the projectile and the field is e. How far from the starting point, does the projectile makes itssecond collision with the field ?
Answer» A projectile is fired with a speed u at an angle theta above a horizontal field. The coefficient of restitution of collision between the projectile and the field is e. How far from the starting point, does the projectile makes itssecond collision with the field ?

Discussion

13.	Which of the following terms does not represent electrical power in a circuit?(a) I2R(b) IR2(c) VI(d)
Answer» Which of the following terms does not represent electrical power in a circuit? (a) I²R (b) IR² (c) VI (d)

13.

Which of the following terms does not represent electrical power in a circuit?(a) I2R(b) IR2(c) VI(d)

Answer»

Which of the following terms does not represent electrical power in a circuit?

(a) I²R

(b) IR²

(c) VI

(d)

Discussion

14.	A circular coil of 100 turns ,radius 10 cm carring the current of 5 ampar .It is suspended vertically in magnetic field of 0.5 p tesla. The field line makes an angel of 60degree with the plan of coil ,calculate torqe?
Answer» A circular coil of 100 turns ,radius 10 cm carring the current of 5 ampar .It is suspended vertically in magnetic field of 0.5 p tesla. The field line makes an angel of 60degree with the plan of coil ,calculate torqe?

Discussion

15.	95.Establish the relation between electric field and potential gradient?
Answer» 95.Establish the relation between electric field and potential gradient?

Discussion

16.	A STONE OF MASS 10GRAMS IS THROWN VERTICALLY UPWARDS.ITS MINIMUM AND MAXIMUM DISTANCE FROM A FIXED POINT A IS 6METRES AND 6ROOT5METRES RESPECTIVELY. WHEN THE STONE IS AT THE MAXIMUM HEIGHT IT IS AT A DISTANCE 10METRES FROM POINT A. FIND THE INITIAL KINETIC ENERGY OF THE BALL
Answer» A STONE OF MASS 10GRAMS IS THROWN VERTICALLY UPWARDS.ITS MINIMUM AND MAXIMUM DISTANCE FROM A FIXED POINT A IS 6METRES AND 6ROOT5METRES RESPECTIVELY. WHEN THE STONE IS AT THE MAXIMUM HEIGHT IT IS AT A DISTANCE 10METRES FROM POINT A. FIND THE INITIAL KINETIC ENERGY OF THE BALL

Discussion

17.	The river water is said to be polluted with acidic wastes if the pH of river water is: (a) zero (b) above 7 (c) below 7 (d) exactly 7
Answer» The river water is said to be polluted with acidic wastes if the pH of river water is: (a) zero (b) above 7 (c) below 7 (d) exactly 7

Discussion

18.	Why g is maximum at earth's surface
Answer» Why g is maximum at earth's surface

Discussion

19.	Three prisms 1,2 and 3 have A =60^°,but their refractive indices are respectively 1.4,1.5,1.6.If Delta1,Delta2 and Delta3 be their respective angles of deviation then Delta1>Delta2>Delta3 Delta1=Delta2=Delta3 Delta1
Answer» Three prisms 1,2 and 3 have A =60^°,but their refractive indices are respectively 1.4,1.5,1.6.If Delta1,Delta2 and Delta3 be their respective angles of deviation then Delta1>Delta2>Delta3 Delta1=Delta2=Delta3 Delta1

Discussion

20.	which element ids habving lowest melting and boiling point a)Ti b)Cu c)Zn d)M
Answer» which element ids habving lowest melting and boiling point a)Ti b)Cu c)Zn d)M

Discussion

21.	If the image formed by a lens for a particular position of an object placed in front of it is always erect and diminished, what is the nature of this lens? Draw a ray diagram to justify your answer. If the numerical value of the power of this lens is 10 D, what is its focal length in the cartesian system ?
Answer» If the image formed by a lens for a particular position of an object placed in front of it is always erect and diminished, what is the nature of this lens? Draw a ray diagram to justify your answer. If the numerical value of the power of this lens is 10 D, what is its focal length in the cartesian system ?

Discussion

22.	8. A man is trying to start a fire by focusing sunlighton a piece of paper using an equiconvex lens of focallength 10 cm. The diameter of the sun is 1,39 x 10 mand its mean distance from the earth is 1.5 x 1011 m,the diameter of the sun's image on the paper is(a) 3.1 x 10-4 m(c) 6.5 x 10-4 m(b) 6.5 x 10-5 m(d) 9.2 x 104 m
Answer» 8. A man is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is 1,39 x 10 m and its mean distance from the earth is 1.5 x 1011 m, the diameter of the sun's image on the paper is (a) 3.1 x 10-4 m (c) 6.5 x 10-4 m (b) 6.5 x 10-5 m (d) 9.2 x 104 m

Discussion

23.	What are CFLs? Why are CFLs prefferred over electric bulbs?
Answer» What are CFLs? Why are CFLs prefferred over electric bulbs?

Discussion

24.	Question 14Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.
Answer» Question 14 Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.

Discussion

25.	State the Universal law of Gravitation.
Answer» State the Universal law of Gravitation.

Discussion

26.	A cubical solid aluminium (bulk modulus =−VdPdV=70 GPa) block has an edge length of 1 m on the surface of the earth. It is kept on the floor of a 5 km deep ocean. Taking the average density of water and the acceleration due to gravity to be 103 kg/m3 and 10 ms−2, respectively, the change in the edge length of the block in mm is
Answer» A cubical solid aluminium (bulk modulus $= - V \frac{d P}{d V} = 70 GPa$ ) block has an edge length of $1 m$ on the surface of the earth. It is kept on the floor of a $5 km$ deep ocean. Taking the average density of water and the acceleration due to gravity to be $10^{3} {kg/m}^{3}$ and $10 {ms}^{- 2}$ , respectively, the change in the edge length of the block in $mm$ is

Discussion

27.	Does coswt+ sin2wt+ cos4t represent periodic motion? If yes, then find the period (o is anypositive constant).
Answer» Does coswt+ sin2wt+ cos4t represent periodic motion? If yes, then find the period (o is anypositive constant).

Discussion

28.	Which among these are primary colours?
Answer» Which among these are primary colours?

Discussion

29.	What is the ratio of the height of an image to the height of an object known as ?
Answer» What is the ratio of the height of an image to the height of an object known as ?

Discussion

30.	A nucleus X initially at rest, undergoes alpha decay according to the equation,ZX232→ 90YA+αWhat fraction of the total energy released in the decay will be the kinetic energy of the alpha particle.
Answer» A nucleus $X$ initially at rest, undergoes alpha decay according to the equation, $_{Z} X^{232} \to_{90} Y^{A} + α$ What fraction of the total energy released in the decay will be the kinetic energy of the alpha particle.

Discussion

31.	Two cells of different emf and internal resistances connected in series with an external resistor. The current in the circuit is 3.0 A. When the polarity of one cell is reversed, the current in the circuit becomes 1.0 A. The ratio of the emf of the two cells is
Answer» Two cells of different emf and internal resistances connected in series with an external resistor. The current in the circuit is $3.0 A$ . When the polarity of one cell is reversed, the current in the circuit becomes $1.0 A$ . The ratio of the emf of the two cells is

Discussion

32.	A convex lens of focal length 40 cm and a concave lens of focal length 25 cm are placed in contact in such a way that they have the common principal axis. Find the power of the combination. [3 MARKS]
Answer» A convex lens of focal length 40 cm and a concave lens of focal length 25 cm are placed in contact in such a way that they have the common principal axis. Find the power of the combination. [3 MARKS]

Discussion

33.	Why dielectric constant for metals is infinity
Answer» Why dielectric constant for metals is infinity

Discussion

34.	A convexlens placed in contact with a planeminor forms an image of a point object on it's aris such that the image coincides with the Object itself. If the distance of the objet 30cm from the lens, what is it's focal length.
Answer» A convexlens placed in contact with a planeminor forms an image of a point object on it's aris such that the image coincides with the Object itself. If the distance of the objet 30cm from the lens, what is it's focal length.

Discussion

35.	Give one use each of a concave mirror and a convex mirror.
Answer» Give one use each of a concave mirror and a convex mirror.

Discussion

36.	The angular momentum of two bodies, rotatingabout some fixed axis are in ratio 1:4. Theirmoment of inertia about these axis are in ratio1: 3. Ratio of their kinetic energies is
Answer» The angular momentum of two bodies, rotatingabout some fixed axis are in ratio 1:4. Theirmoment of inertia about these axis are in ratio1: 3. Ratio of their kinetic energies is

Discussion

37.	100.The angle of minimum deviation produced by a hollow Prism filled with certain liquid is found to be 30^°.The angle of refraction is also found to be 30^° at first surface. The refractive index of liquid is?
Answer» 100.The angle of minimum deviation produced by a hollow Prism filled with certain liquid is found to be 30^°.The angle of refraction is also found to be 30^° at first surface. The refractive index of liquid is?

Discussion

38.	State three factors on which the resistance of a wire depends. Explain how does the resistance depend on the factors stated by you.
Answer» State three factors on which the resistance of a wire depends. Explain how does the resistance depend on the factors stated by you.

Discussion

39.	Why do stars twinkle?
Answer» Why do stars twinkle?

Discussion

40.	What is likely to happen and how it would affect the value of resistance if the current is made to pass for a longer time?
Answer» What is likely to happen and how it would affect the value of resistance if the current is made to pass for a longer time?

Discussion

41.	Briefly explain the working principle of lenses.
Answer» Briefly explain the working principle of lenses.

Discussion

42.	Three students (A), (B) and (C) connect their two given resistors R1 and R2 in the manners shown below:They connect the terminals marked X and Y above to the terminals marked X and Y in the circuit given below:They record the ammeter reading (I) for different positions of the rheostat and the corresponding Voltmeter readings (V).The average value of the ratio V/I in their observations would be minimum for :(1) students (A) and (B) only(2) students (B) and (C) only(3) students (C) and (A) only(4) student (A) only
Answer» Three students (A), (B) and (C) connect their two given resistors R₁ and R₂ in the manners shown below: They connect the terminals marked X and Y above to the terminals marked X and Y in the circuit given below: They record the ammeter reading (I) for different positions of the rheostat and the corresponding Voltmeter readings (V). The average value of the ratio V/I in their observations would be minimum for : (1) students (A) and (B) only (2) students (B) and (C) only (3) students (C) and (A) only (4) student (A) only

Discussion

43.	5.10 A body of mass 0.40 kg moving initially with a constant speed of 10 ms tothe north is subject to a constant force of 8.0 N directed towards the southfor 30 s. Take the instant the force is applied to bę t=0, the position of thebody at that time to be x= 0, and predict its positionat t=-5sec,25sec,100sec
Answer» 5.10 A body of mass 0.40 kg moving initially with a constant speed of 10 ms tothe north is subject to a constant force of 8.0 N directed towards the southfor 30 s. Take the instant the force is applied to bę t=0, the position of thebody at that time to be x= 0, and predict its positionat t=-5sec,25sec,100sec

Discussion

44.	explain the following property of magnetic field lines "in the region of stronger field the lines converge and in the region ofweaker fields the line diverge
Answer» explain the following property of magnetic field lines "in the region of stronger field the lines converge and in the region ofweaker fields the line diverge

Discussion

45.	A convex lens of focal length 0.10 m is used to form a magnified image of an object of height 5 mm placed at a distance of 0.08 m from the lens. Calculate the position, nature and size of the image.
Answer» A convex lens of focal length 0.10 m is used to form a magnified image of an object of height 5 mm placed at a distance of 0.08 m from the lens. Calculate the position, nature and size of the image.

Discussion

46.	What is meant by total internal reflection?
Answer» What is meant by total internal reflection?

Discussion

47.	Schematic diagram for Rankine cycle is shown in figure below:The work requried by the pump is _____ kW. (Take mass flow rate of water as 1.3 kg/s and density of 1000 kg/m3) (Correct to two decimal place)26.15
Answer» Schematic diagram for Rankine cycle is shown in figure below: The work requried by the pump is _____ kW. (Take mass flow rate of water as 1.3 kg/s and density of $1000 k g / m^{3}$ ) (Correct to two decimal place) 26.15

Discussion

48.	A rectangular loop made of flexible conducting wire carrying clockwise current is placed in a uniform magnetic field B directed inwards into the plane of paper. The length and breadth of the loop are 'a' and 'b' units and the resistance is R. Choose the correct alternative(s). i) the loop develops induced anti clockwise current for a short time ii) the loop finally has area equal to 0.25(a+b)²iii) centre of mass of loop does not change its position iv) induced charge flown through the loop is [B(a²+b²+ab)] /πR
Answer» A rectangular loop made of flexible conducting wire carrying clockwise current is placed in a uniform magnetic field B directed inwards into the plane of paper. The length and breadth of the loop are 'a' and 'b' units and the resistance is R. Choose the correct alternative(s). i) the loop develops induced anti clockwise current for a short time ii) the loop finally has area equal to 0.25(a+b)² iii) centre of mass of loop does not change its position iv) induced charge flown through the loop is [B(a²+b²+ab)] /πR

Discussion

49.	Two different types of lenses are placed on a sheet of newspaper. How will you identify their type without touching them?
Answer» Two different types of lenses are placed on a sheet of newspaper. How will you identify their type without touching them?

Discussion

50.	According to Newton’s first law of motion, there can be no acceleration without a net force. So there has to be___
Answer» According to Newton’s first law of motion, there can be no acceleration without a net force. So there has to be___

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

13.Two wires A and B are of equal length and have equal resistance .If the resistivity of A is more than that of B Which wire is thicker and why?

Question 3Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?

Name two appliances in which an electric motor is used.

A closed organ pipe has lenght l .The air in it is vibrating in 3rd overtone with maximum amplitude a .The amplitude at a dis†an ce of l/7 from closed end of the pe is equal to

The number of turns in primary and secondary coils of an ideal transformer is 50 and 200 respectively. If the current in the primary coil is 4 A. The current in the secondary coil is-

Speed of a planet in an elliptical orbit with semi major axis 'a' about sun of mass M at a distance r from sun is

Mention a few applications of spherical mirrors.

A uniform ring of radius R is moving in a horizontal surface with speed V and then climbs upa ramps of inclination 30^° to height H. There is no shipping in entire motion then find the value of H ?

Why does a pencil partly immersed in water appears to be bent inside the water?

On adding the number of protons and the number of neutrons in the nucleus of an atom, Sam got the ___ of the considered element.

A projectile is fired with a speed u at an angle theta above a horizontal field. The coefficient of restitution of collision between the projectile and the field is e. How far from the starting point, does the projectile makes itssecond collision with the field ?

Which of the following terms does not represent electrical power in a circuit?(a) I2R(b) IR2(c) VI(d)

A circular coil of 100 turns ,radius 10 cm carring the current of 5 ampar .It is suspended vertically in magnetic field of 0.5 p tesla. The field line makes an angel of 60degree with the plan of coil ,calculate torqe?

95.Establish the relation between electric field and potential gradient?

A STONE OF MASS 10GRAMS IS THROWN VERTICALLY UPWARDS.ITS MINIMUM AND MAXIMUM DISTANCE FROM A FIXED POINT A IS 6METRES AND 6ROOT5METRES RESPECTIVELY. WHEN THE STONE IS AT THE MAXIMUM HEIGHT IT IS AT A DISTANCE 10METRES FROM POINT A. FIND THE INITIAL KINETIC ENERGY OF THE BALL

The river water is said to be polluted with acidic wastes if the pH of river water is: (a) zero (b) above 7 (c) below 7 (d) exactly 7

Why g is maximum at earth's surface

Three prisms 1,2 and 3 have A =60^°,but their refractive indices are respectively 1.4,1.5,1.6.If Delta1,Delta2 and Delta3 be their respective angles of deviation then Delta1>Delta2>Delta3 Delta1=Delta2=Delta3 Delta1

which element ids habving lowest melting and boiling point a)Ti b)Cu c)Zn d)M

What are CFLs? Why are CFLs prefferred over electric bulbs?

Question 14Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.

State the Universal law of Gravitation.

Does coswt+ sin2wt+ cos4t represent periodic motion? If yes, then find the period (o is anypositive constant).

Which among these are primary colours?

What is the ratio of the height of an image to the height of an object known as ?

A nucleus X initially at rest, undergoes alpha decay according to the equation,ZX232→ 90YA+αWhat fraction of the total energy released in the decay will be the kinetic energy of the alpha particle.

Two cells of different emf and internal resistances connected in series with an external resistor. The current in the circuit is 3.0 A. When the polarity of one cell is reversed, the current in the circuit becomes 1.0 A. The ratio of the emf of the two cells is

A convex lens of focal length 40 cm and a concave lens of focal length 25 cm are placed in contact in such a way that they have the common principal axis. Find the power of the combination. [3 MARKS]

Why dielectric constant for metals is infinity

A convexlens placed in contact with a planeminor forms an image of a point object on it's aris such that the image coincides with the Object itself. If the distance of the objet 30cm from the lens, what is it's focal length.

Give one use each of a concave mirror and a convex mirror.

The angular momentum of two bodies, rotatingabout some fixed axis are in ratio 1:4. Theirmoment of inertia about these axis are in ratio1: 3. Ratio of their kinetic energies is

100.The angle of minimum deviation produced by a hollow Prism filled with certain liquid is found to be 30^°.The angle of refraction is also found to be 30^° at first surface. The refractive index of liquid is?

State three factors on which the resistance of a wire depends. Explain how does the resistance depend on the factors stated by you.

Why do stars twinkle?

What is likely to happen and how it would affect the value of resistance if the current is made to pass for a longer time?

Briefly explain the working principle of lenses.

explain the following property of magnetic field lines "in the region of stronger field the lines converge and in the region ofweaker fields the line diverge

A convex lens of focal length 0.10 m is used to form a magnified image of an object of height 5 mm placed at a distance of 0.08 m from the lens. Calculate the position, nature and size of the image.

What is meant by total internal reflection?

Schematic diagram for Rankine cycle is shown in figure below:The work requried by the pump is _____ kW. (Take mass flow rate of water as 1.3 kg/s and density of 1000 kg/m3) (Correct to two decimal place)26.15

Two different types of lenses are placed on a sheet of newspaper. How will you identify their type without touching them?

According to Newton’s first law of motion, there can be no acceleration without a net force. So there has to be___