16569 + Interview Questions in Physics

1.	In proton-proton cycle, four hydrogen atoms combine to release energy
Answer» In proton-proton cycle, four hydrogen atoms combine to release energy

Discussion

2.	Arrange the colours green, red, and indigo in the order of decreasing wavelength.
Answer» Arrange the colours green, red, and indigo in the order of decreasing wavelength.

Discussion

3.	A student performs the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He measures the angle of incidence ∠i, angle of refraction ∠r and angle of emergence ∠e for all his observations. He would find that in all cases:(1) ∠i is more than ∠r but (nearly) equal to ∠e(2) ∠i is less than ∠r but (nearly equal to ∠e(3) ∠i s more than ∠e but (nearly) equal to ∠r(4) ∠i is less than ∠e but (nearly) equal to ∠r
Answer» A student performs the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He measures the angle of incidence ∠i, angle of refraction ∠r and angle of emergence ∠e for all his observations. He would find that in all cases: (1) ∠i is more than ∠r but (nearly) equal to ∠e (2) ∠i is less than ∠r but (nearly equal to ∠e (3) ∠i s more than ∠e but (nearly) equal to ∠r (4) ∠i is less than ∠e but (nearly) equal to ∠r

Discussion

4.	In the following circuit E1=4V,R1=2Ω E2=6V,R2=2Ω and R3=4Ω. The current i1 is
Answer» In the following circuit $E_{1} = 4 V, R_{1} = 2 Ω$ $E_{2} = 6 V, R_{2} = 2 Ω$ and $R_{3} = 4 Ω$ . The current $i_{1}$ is

Discussion

5.	for sky wave propagation of a 10MHz signal what should be the minimum electron density in ionosphere
Answer» for sky wave propagation of a 10MHz signal what should be the minimum electron density in ionosphere

Discussion

6.	Electric fuse works on the principle of _________ effect of electric current.
Answer» Electric fuse works on the principle of _________ effect of electric current.

Discussion

7.	how to find nearest neighbour and next nearest neighbour in ccp,fcc and bcc respectivel
Answer» how to find nearest neighbour and next nearest neighbour in ccp,fcc and bcc respectivel

Discussion

8.	A beam of monochromatic light is incident at i=50° on one face of an equilateral prism, the angle of emergence is 40°, then the angle of minimum deviation is : (A) 30° (B) <30° (C) ≤30° (D)≥30°
Answer» A beam of monochromatic light is incident at i=50° on one face of an equilateral prism, the angle of emergence is 40°, then the angle of minimum deviation is : (A) 30° (B) <30° (C) ≤30° (D)≥30°

8.

A beam of monochromatic light is incident at i=50° on one face of an equilateral prism, the angle of emergence is 40°, then the angle of minimum deviation is : (A) 30° (B) <30° (C) ≤30° (D)≥30°

Answer»

A beam of monochromatic light is incident at i=50° on one face of an equilateral prism, the angle of emergence is 40°, then the angle of minimum deviation is :

(A) 30° (B) <30° (C) ≤30° (D)≥30°

Discussion

9.	4.In the circuit shown in figure, the battery is an ideal one with emf V. The capacitor is initially uncharged. The switch S is closed at time t =0. (a) Find the charge Q on the capacitor at time t. (b) Find the current in AB at time t. What is its limiting value as t tends to infinity?
Answer» 4.In the circuit shown in figure, the battery is an ideal one with emf V. The capacitor is initially uncharged. The switch S is closed at time t =0. (a) Find the charge Q on the capacitor at time t. (b) Find the current in AB at time t. What is its limiting value as t tends to infinity?

Discussion

10.	What happens to a ray of light when it goes obliquely from an optically rarer to an optically denser medium?
Answer» What happens to a ray of light when it goes obliquely from an optically rarer to an optically denser medium?

Discussion

11.	Describe the phenomenon behind the twinkling of star
Answer» Describe the phenomenon behind the twinkling of star

Discussion

12.	A satellite gets unstable in its orbit and starts to fall towards Earth and also starts heating. If the satellite had a potential energy of 1000 J initially and by the time it reaches Earth's surface, it attains a kinetic energy of 500 J. Then, how much energy is spent in the form of heat?
Answer» A satellite gets unstable in its orbit and starts to fall towards Earth and also starts heating. If the satellite had a potential energy of 1000 J initially and by the time it reaches Earth's surface, it attains a kinetic energy of 500 J. Then, how much energy is spent in the form of heat?

Discussion

13.	68.The angle of incidence for a ray of light at a retracting surface of a prism is 45 degree.the angle of prism is 60 degree.if the ray suffers minimum deviation through the prism the angle of minimum deviation and refractive index of the material of the prism is?
Answer» 68.The angle of incidence for a ray of light at a retracting surface of a prism is 45 degree.the angle of prism is 60 degree.if the ray suffers minimum deviation through the prism the angle of minimum deviation and refractive index of the material of the prism is?

Discussion

14.	Why are copper and aluminium wires usually employed for electricity transmission?
Answer» Why are copper and aluminium wires usually employed for electricity transmission?

Discussion

15.	A bullet fired at an angle of 60° with vertical hits the ground at a distance of 2 km. Calculate the distance at which the bullet will hit the ground when fired at an angle of 45°, assuming the speed to be same??
Answer» A bullet fired at an angle of 60° with vertical hits the ground at a distance of 2 km. Calculate the distance at which the bullet will hit the ground when fired at an angle of 45°, assuming the speed to be same??

Discussion

16.	Earthquake waves are measured using
Answer» Earthquake waves are measured using

Discussion

17.	Circuit component across an ac source (w = 200 rad/sec)(A) R = 10 ohm, C = 500 microfarad(B) L = 5H (C) C = 500 microfarad(D) L = 4H, C = 3 microfarad(E) R = 1kiloohm, L = 5H Calculate Phase difference between current and source voltage in each cases-
Answer» Circuit component across an ac source (w = 200 rad/sec) (A) R = 10 ohm, C = 500 microfarad (B) L = 5H (C) C = 500 microfarad (D) L = 4H, C = 3 microfarad (E) R = 1kiloohm, L = 5H Calculate Phase difference between current and source voltage in each cases-

Discussion

18.	State energy conversion that takes place during working of Microphone is
Answer» State energy conversion that takes place during working of Microphone is

Discussion

19.	At what temperature will the pressure of gas reach the bursting limit, if 10 g of C2H6 is filled in a bulb having 1 litre capacity which can withstand a maximum pressure of 10 atm?
Answer» At what temperature will the pressure of gas reach the bursting limit, if $10 g$ of $C_{2} H_{6}$ is filled in a bulb having 1 litre capacity which can withstand a maximum pressure of $10 atm$ ?

Discussion

20.	A cylinder of radius R is surrounded by a cylinder shell of inner radius R and outer radius 2R. The thermal conductivity of the material of the cylinder is K1 and that of the outer cylinder is K2. Assuming no loss of heat, the effective thermal conductivity of the system for heat flowing along the length of the cylinder is:
Answer» A cylinder of radius $R$ is surrounded by a cylinder shell of inner radius $R$ and outer radius $2 R$ . The thermal conductivity of the material of the cylinder is $K_{1}$ and that of the outer cylinder is $K_{2}$ . Assuming no loss of heat, the effective thermal conductivity of the system for heat flowing along the length of the cylinder is:

Discussion

21.	ntA long solenoid has 1500 turns per metre and an iron core of relative permeability =1100 is kept inside it .2A current flows in the coil of solenoid .If core is heated beyond curie temperature then why H field in solenoid is nearly unchanged but B field decreases significantly?n
Answer» ntA long solenoid has 1500 turns per metre and an iron core of relative permeability =1100 is kept inside it .2A current flows in the coil of solenoid .If core is heated beyond curie temperature then why H field in solenoid is nearly unchanged but B field decreases significantly?n

Discussion

22.	The block diagram of a system is illustrated inthe figure shown, where X(s) is the input and Y(s) is the output. the transfer function H(s)=Y(s)X(s) is
Answer» The block diagram of a system is illustrated inthe figure shown, where $X (s)$ is the input and $Y (s)$ is the output. the transfer function $H (s) = \frac{Y (s)}{X (s)} i s$

Discussion

23.	State the dependence of angle of deviation: (i) On the refractive index of the material of the prism. (ii) On the wavelength of light.
Answer» State the dependence of angle of deviation: (i) On the refractive index of the material of the prism. (ii) On the wavelength of light.

Discussion

24.	if surface reflects completely the radiation falling on it then radiation pressure is given by with complee explanation
Answer» if surface reflects completely the radiation falling on it then radiation pressure is given by with complee explanation

Discussion

25.	Which type of signal can store more data in limited space?
Answer» Which type of signal can store more data in limited space?

Discussion

26.	What is the meaning of erect image?
Answer» What is the meaning of erect image?

Discussion

27.	How can three resistors of resistances 2 Ω, 3 Ω and 6 Ω be connected to give a total resistance of (a) 4 Ω, (b) 1 Ω?
Answer» How can three resistors of resistances 2 Ω, 3 Ω and 6 Ω be connected to give a total resistance of (a) 4 Ω, (b) 1 Ω?

Discussion

28.	In parallel combinationof resistances: (a) p.d. is same across each resistance (b) total resistance is increased (c) current is same in each resistance (d) all above are true.
Answer» In parallel combinationof resistances: (a) p.d. is same across each resistance (b) total resistance is increased (c) current is same in each resistance (d) all above are true.

Discussion

29.	Assuming the nuclei to be in spherical shape,how does the surface area of the nucleus of mass number A_1 compare with that of nucleus of mass number A_2
Answer» Assuming the nuclei to be in spherical shape,how does the surface area of the nucleus of mass number A_1 compare with that of nucleus of mass number A_2

Discussion

30.	Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10 % of the input energy. How much power is generated by the turbine?g=10 m/s2
Answer» Water falls from a height of $60 m$ at the rate of $15 kg/s$ to operate a turbine. The losses due to frictional force are $10 %$ of the input energy. How much power is generated by the turbine? $g = 10 {m/s}^{2}$

Discussion

31.	What is the difference between charge and energy? Are they interrelated
Answer» What is the difference between charge and energy? Are they interrelated

Discussion

32.	In which direction does the magnetic field lines run inside a bar magnet?
Answer» In which direction does the magnetic field lines run inside a bar magnet?

Discussion

33.	A concave mirror forms
Answer» A concave mirror forms

Discussion

34.	Among the following colours, which is the highest absorbent of heat radiations?
Answer» Among the following colours, which is the highest absorbent of heat radiations?

Discussion

35.	A TV set shoots out a beam of electrons. The beam current is 10 A. How many electrons will strike the TV screen in a minute?
Answer» A TV set shoots out a beam of electrons. The beam current is 10 A. How many electrons will strike the TV screen in a minute?

Discussion

36.	A small conducting spherical shell with inner radius a and outer radius b is concentric with a larger conducting spherical shell with inner radius c and outer radius d as shown in the figure. The inner shell has total charge +2q and outer shell has charge +4q. The graph of radial component of electric field (E) as a function of distance (r) from centre of shell will be:
Answer» A small conducting spherical shell with inner radius $a$ and outer radius $b$ is concentric with a larger conducting spherical shell with inner radius $c$ and outer radius $d$ as shown in the figure. The inner shell has total charge $+ 2 q$ and outer shell has charge $+ 4 q$ . The graph of radial component of electric field ( $E$ ) as a function of distance ( $r$ ) from centre of shell will be:

Discussion

37.	Which part of the solar cooker is responsible for green house effect in it?
Answer» Which part of the solar cooker is responsible for green house effect in it?

Discussion

38.	12.a coin placed on a rotating turntable slips when it is placed at a distance of 9 cm from the centre. if the angular velocity of the turntable is tripled it will just slip, if its distance from centre is
Answer» 12.a coin placed on a rotating turntable slips when it is placed at a distance of 9 cm from the centre. if the angular velocity of the turntable is tripled it will just slip, if its distance from centre is

Discussion

39.	A stationary swimmer S inside liquid of refractive index μ1 is at a dis†an ce d from a fixed point P inside the liquid .A rec†an gular block of width t and refractive index μ2(μ2
Answer» A stationary swimmer S inside liquid of refractive index μ1 is at a dis†an ce d from a fixed point P inside the liquid .A rec†an gular block of width t and refractive index μ2(μ2

Discussion

40.	A current of 2 amperes (2A) flows through a conductor of resistance 20Ω for 5 minutes. Calculate the amount of heat produced in KJ.
Answer» A current of 2 amperes (2A) flows through a conductor of resistance $20 Ω$ for 5 minutes. Calculate the amount of heat produced in KJ.

Discussion

41.	The radii of curvature of the two surfaces of a lens are 20 cm and 30 cm and the refractive index of the material of the lens is 1.5. If the lens is concavo convex then , the focal length of the lens is ( in cm)
Answer» The radii of curvature of the two surfaces of a lens are $20 cm$ and $30 cm$ and the refractive index of the material of the lens is $1.5$ . If the lens is concavo convex then , the focal length of the lens is $($ in $cm)$

Discussion

42.	ntProve that due to conservative nature of electric field, the electrostatic field lines will not form any closed loop.n
Answer» ntProve that due to conservative nature of electric field, the electrostatic field lines will not form any closed loop.n

Discussion

43.	Light falls at normal incidence on one face of a glass prism of refractive index 1.5, what will be the angle of emergence when the angle of the prism is
Answer» Light falls at normal incidence on one face of a glass prism of refractive index 1.5, what will be the angle of emergence when the angle of the prism is

Discussion

44.	One of the two long wires carries current 1A and current 2A, the currents are in the same direction, they are placed parallel to each other, generating a net magnetic field B at the midpoint. When Section 1A is closed, what will be the area at the midpoint?
Answer» One of the two long wires carries current 1A and current 2A, the currents are in the same direction, they are placed parallel to each other, generating a net magnetic field B at the midpoint. When Section 1A is closed, what will be the area at the midpoint?

Discussion

45.	The nature of the image formed by the convex mirror is always
Answer» The nature of the image formed by the convex mirror is always

Discussion

46.	Question 2Which one of the following has the highest calorific value?(a) Kerosene(b) LPG(c) Biogas(d) Petrol
Answer» Question 2 Which one of the following has the highest calorific value? (a) Kerosene (b) LPG (c) Biogas (d) Petrol

Discussion

47.	The graph shown in the figure represents change in the temperature of 5 kg of a substance with time, as it absorbs heat at a constant rate of 42 kJ min−1. What would be the latent heat of vapourization of the substance?
Answer» The graph shown in the figure represents change in the temperature of $5 k g$ of a substance with time, as it absorbs heat at a constant rate of $42 k J$ $m i n^{- 1}$ . What would be the latent heat of vapourization of the substance?

Discussion

48.	Why are copper and aluminium wires usually used for electricity transimission?
Answer» Why are copper and aluminium wires usually used for electricity transimission?

Discussion

49.	velocit
Answer» velocit

Discussion

50.	A coil of inductance 8.4mH and resistance 6ohm is connected to a 12 V battery in series . the current in the coil is 1 A at approximately the time?
Answer» A coil of inductance 8.4mH and resistance 6ohm is connected to a 12 V battery in series . the current in the coil is 1 A at approximately the time?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In proton-proton cycle, four hydrogen atoms combine to release energy

Arrange the colours green, red, and indigo in the order of decreasing wavelength.

In the following circuit E1=4V,R1=2Ω E2=6V,R2=2Ω and R3=4Ω. The current i1 is

for sky wave propagation of a 10MHz signal what should be the minimum electron density in ionosphere

Electric fuse works on the principle of _________ effect of electric current.

how to find nearest neighbour and next nearest neighbour in ccp,fcc and bcc respectivel

A beam of monochromatic light is incident at i=50° on one face of an equilateral prism, the angle of emergence is 40°, then the angle of minimum deviation is : (A) 30° (B) &lt;30° (C) ≤30° (D)≥30°

4.In the circuit shown in figure, the battery is an ideal one with emf V. The capacitor is initially uncharged. The switch S is closed at time t =0. (a) Find the charge Q on the capacitor at time t. (b) Find the current in AB at time t. What is its limiting value as t tends to infinity?

What happens to a ray of light when it goes obliquely from an optically rarer to an optically denser medium?

Describe the phenomenon behind the twinkling of star

A satellite gets unstable in its orbit and starts to fall towards Earth and also starts heating. If the satellite had a potential energy of 1000 J initially and by the time it reaches Earth's surface, it attains a kinetic energy of 500 J. Then, how much energy is spent in the form of heat?

68.The angle of incidence for a ray of light at a retracting surface of a prism is 45 degree.the angle of prism is 60 degree.if the ray suffers minimum deviation through the prism the angle of minimum deviation and refractive index of the material of the prism is?

Why are copper and aluminium wires usually employed for electricity transmission?

A bullet fired at an angle of 60° with vertical hits the ground at a distance of 2 km. Calculate the distance at which the bullet will hit the ground when fired at an angle of 45°, assuming the speed to be same??

Earthquake waves are measured using

Circuit component across an ac source (w = 200 rad/sec)(A) R = 10 ohm, C = 500 microfarad(B) L = 5H (C) C = 500 microfarad(D) L = 4H, C = 3 microfarad(E) R = 1kiloohm, L = 5H Calculate Phase difference between current and source voltage in each cases-

State energy conversion that takes place during working of Microphone is

At what temperature will the pressure of gas reach the bursting limit, if 10 g of C2H6 is filled in a bulb having 1 litre capacity which can withstand a maximum pressure of 10 atm?

ntA long solenoid has 1500 turns per metre and an iron core of relative permeability =1100 is kept inside it .2A current flows in the coil of solenoid .If core is heated beyond curie temperature then why H field in solenoid is nearly unchanged but B field decreases significantly?n

The block diagram of a system is illustrated inthe figure shown, where X(s) is the input and Y(s) is the output. the transfer function H(s)=Y(s)X(s) is

State the dependence of angle of deviation: (i) On the refractive index of the material of the prism. (ii) On the wavelength of light.

if surface reflects completely the radiation falling on it then radiation pressure is given by with complee explanation

Which type of signal can store more data in limited space?

What is the meaning of erect image?

How can three resistors of resistances 2 Ω, 3 Ω and 6 Ω be connected to give a total resistance of (a) 4 Ω, (b) 1 Ω?

In parallel combinationof resistances: (a) p.d. is same across each resistance (b) total resistance is increased (c) current is same in each resistance (d) all above are true.

Assuming the nuclei to be in spherical shape,how does the surface area of the nucleus of mass number A_1 compare with that of nucleus of mass number A_2

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10 % of the input energy. How much power is generated by the turbine?g=10 m/s2

What is the difference between charge and energy? Are they interrelated

In which direction does the magnetic field lines run inside a bar magnet?

A concave mirror forms

Among the following colours, which is the highest absorbent of heat radiations?

A TV set shoots out a beam of electrons. The beam current is 10 A. How many electrons will strike the TV screen in a minute?

Which part of the solar cooker is responsible for green house effect in it?

12.a coin placed on a rotating turntable slips when it is placed at a distance of 9 cm from the centre. if the angular velocity of the turntable is tripled it will just slip, if its distance from centre is

A stationary swimmer S inside liquid of refractive index μ1 is at a dis†an ce d from a fixed point P inside the liquid .A rec†an gular block of width t and refractive index μ2(μ2

A current of 2 amperes (2A) flows through a conductor of resistance 20Ω for 5 minutes. Calculate the amount of heat produced in KJ.

The radii of curvature of the two surfaces of a lens are 20 cm and 30 cm and the refractive index of the material of the lens is 1.5. If the lens is concavo convex then , the focal length of the lens is ( in cm)

ntProve that due to conservative nature of electric field, the electrostatic field lines will not form any closed loop.n

Light falls at normal incidence on one face of a glass prism of refractive index 1.5, what will be the angle of emergence when the angle of the prism is

One of the two long wires carries current 1A and current 2A, the currents are in the same direction, they are placed parallel to each other, generating a net magnetic field B at the midpoint. When Section 1A is closed, what will be the area at the midpoint?

The nature of the image formed by the convex mirror is always

Question 2Which one of the following has the highest calorific value?(a) Kerosene(b) LPG(c) Biogas(d) Petrol

The graph shown in the figure represents change in the temperature of 5 kg of a substance with time, as it absorbs heat at a constant rate of 42 kJ min−1. What would be the latent heat of vapourization of the substance?

Why are copper and aluminium wires usually used for electricity transimission?

velocit

A coil of inductance 8.4mH and resistance 6ohm is connected to a 12 V battery in series . the current in the coil is 1 A at approximately the time?

A beam of monochromatic light is incident at i=50° on one face of an equilateral prism, the angle of emergence is 40°, then the angle of minimum deviation is : (A) 30° (B) <30° (C) ≤30° (D)≥30°