16569 + Interview Questions in Physics Page 7 InterviewSolution

301.	Why do we see stars mostly at night?
Answer» Why do we see stars mostly at night?

Discussion

302.	An arrangement of plane mirrors and a spherical glass surface is shown in figure. O is the centre of the spherical portion. The incident light ray from air makes an angle of 60∘ with the normal and the normal makes an angle of 60∘ with each plane mirrors. The value of refractive index for which a light ray retraces its path will be
Answer» An arrangement of plane mirrors and a spherical glass surface is shown in figure. $O$ is the centre of the spherical portion. The incident light ray from air makes an angle of $60^{\circ}$ with the normal and the normal makes an angle of $60^{\circ}$ with each plane mirrors. The value of refractive index for which a light ray retraces its path will be

Discussion

303.	Which of the following statement is correct with respect to geothermal energy?
Answer» Which of the following statement is correct with respect to geothermal energy?

Discussion

304.	which will react with RMgX if -CN and -OCH3 are present on ring . how will we decide that orde
Answer» which will react with RMgX if -CN and -OCH3 are present on ring . how will we decide that orde

Discussion

305.	Which one of the following is not a renewable resource?
Answer» Which one of the following is not a renewable resource?

Discussion

306.	In a rocket, fuel burns at the rate of 2kg/s. This fuel gets ejected from the rocket with a relative velocity of 80km/s. Net force exerted on the rocket (just about to take off from ground) of mass 2000 kg is:-(1) 16,000 N, (2) 1,60,000 N, (3) 1,80,000 N, (4) 1,40,000N.
Answer» In a rocket, fuel burns at the rate of 2kg/s. This fuel gets ejected from the rocket with a relative velocity of 80km/s. Net force exerted on the rocket (just about to take off from ground) of mass 2000 kg is:-(1) 16,000 N, (2) 1,60,000 N, (3) 1,80,000 N, (4) 1,40,000N.

Discussion

307.	Why are the 'danger signal' lights red in colour ?
Answer» Why are the 'danger signal' lights red in colour ?

Discussion

308.	Light is a form of energy. Energy not be created nor be destroyed. When light ray falls on any surface some or more amount of light get absorb. How?
Answer» Light is a form of energy. Energy not be created nor be destroyed. When light ray falls on any surface some or more amount of light get absorb. How?

Discussion

309.	Why does a ray of light bend when it travels from one medium into another?
Answer» Why does a ray of light bend when it travels from one medium into another?

Discussion

310.	hybridisation of \lbrack ni\rbrack co4?
Answer» hybridisation of \lbrack ni\rbrack co4?

Discussion

311.	In a step-up transformer the number of turns, in the secondary coil are more than the number of turns in the primary coil. Thus the i) voltage and ii) current in the secondary coil is
Answer» In a step-up transformer the number of turns, in the secondary coil are more than the number of turns in the primary coil. Thus the i) voltage and ii) current in the secondary coil is

311.

In a step-up transformer the number of turns, in the secondary coil are more than the number of turns in the primary coil. Thus the i) voltage and ii) current in the secondary coil is

Answer»

In a step-up transformer the number of turns, in the secondary coil are more than the number of turns in the primary coil. Thus the

i) voltage and

ii) current in the secondary coil is

Discussion

312.	A liquid drop of radius r moving with velocity v, collides with another drop of same liquid of radius 2r at rest. If the two drops combined together, then velocity of combined drop will be Options:a-v/3 b-v/6 c-v/9 d-v/12
Answer» A liquid drop of radius r moving with velocity v, collides with another drop of same liquid of radius 2r at rest. If the two drops combined together, then velocity of combined drop will be Options:a-v/3 b-v/6 c-v/9 d-v/12

Discussion

313.	How to calculate formal charge of SO3
Answer» How to calculate formal charge of SO3

Discussion

314.	What should be the length of the day, so that the weight of a body on the equator of earth becomes zero ?
Answer» What should be the length of the day, so that the weight of a body on the equator of earth becomes zero ?

Discussion

315.	A solenoid of 100 turns and having current of 5 A acts as a bar magnet having area of cross-section 0.1 cm2. Find the magnetic field at a point P situated at distance 0.5 m from the centre on its axis
Answer» A solenoid of $100$ turns and having current of $5 A$ acts as a bar magnet having area of cross-section $0.1 {cm}^{2}$ . Find the magnetic field at a point $P$ situated at distance $0.5 m$ from the centre on its axis

Discussion

316.	Question 14In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?(a) Brightness of all the bulbs will be the same(b) Brightness of bulb A will be the maximum(c) Brightness of bulb B will be more than that of A(d) Brightness of bulb C will be less than that of B
Answer» Question 14 In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness? (a) Brightness of all the bulbs will be the same (b) Brightness of bulb A will be the maximum (c) Brightness of bulb B will be more than that of A (d) Brightness of bulb C will be less than that of B

Discussion

317.	Why is the image highly magnified when placed at the principal focus ?
Answer» Why is the image highly magnified when placed at the principal focus ?

Discussion

318.	24. Standard enthalpy of vapourisation for water at 10degree celcius is 40.66kJmol-the internal energy of vapourisaction of water at 100degree celcius
Answer» 24. Standard enthalpy of vapourisation for water at 10degree celcius is 40.66kJmol-the internal energy of vapourisaction of water at 100degree celcius

Discussion

319.	Examples of transverse wave and longitudinal wave
Answer» Examples of transverse wave and longitudinal wave

Discussion

320.	A part of a circuit is shown in figure. Here reading of ammeter is 5 A and voltmeter is 96 V & voltmeter resistance is 480 Ω. Then find the resistance R
Answer» A part of a circuit is shown in figure. Here reading of ammeter is $5 A$ and voltmeter is $96 V$ & voltmeter resistance is $480 Ω$ . Then find the resistance $R$

Discussion

321.	Two identical metal spheres carry charges of + q and - 2q respectively. When the spheres are separated bya large distance r, the force between them is F. Now the spheres are allowed to touch and then moved backto the same separation. Find the new force of repulsion between them.1.ас
Answer» Two identical metal spheres carry charges of + q and - 2q respectively. When the spheres are separated bya large distance r, the force between them is F. Now the spheres are allowed to touch and then moved backto the same separation. Find the new force of repulsion between them.1.ас

Discussion

322.	find the potential energy of an electron in 1st excited state of Be3+ion
Answer» find the potential energy of an electron in 1st excited state of Be3+ion

Discussion

323.	A rifle of mass 5 kg fires a bullet of mass 40 gm. The bullet leaves the barrel of the rifle with a velocity 200 ms. If the bullet takes 0.004 s to move through the barrel, calculate the recoil velocity of the rifle.
Answer» A rifle of mass 5 kg fires a bullet of mass 40 gm. The bullet leaves the barrel of the rifle with a velocity 200 $\frac{m}{s}$ . If the bullet takes 0.004 s to move through the barrel, calculate the recoil velocity of the rifle.

Discussion

324.	Flowing water can rotate a turbine. Which type of energy is used up by the turbine?
Answer» Flowing water can rotate a turbine. Which type of energy is used up by the turbine?

Discussion

325.	A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistances, which may be used separately, in series, or in parallel. What are the currents in the three cases?
Answer» A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistances, which may be used separately, in series, or in parallel. What are the currents in the three cases?

Discussion

326.	A ray of light is incident to the hypotenuse of a right-angled prism after travelling parallel to the base inside the prism. If μ is the refractive index of the material of the prism, the maximum value of the base angle for which light is totally reflected from the hypotenuse is
Answer» A ray of light is incident to the hypotenuse of a right-angled prism after travelling parallel to the base inside the prism. If $μ$ is the refractive index of the material of the prism, the maximum value of the base angle for which light is totally reflected from the hypotenuse is

Discussion

327.	A uniform rod of mass 300 g and length 50 cm rotates at a uniform angular speed of 2 rad/s about an axis perpendicular to the rod through an end. The angular momentum of the rod about the axis of rotation, the speed of the centre of the rod and its kinetic energy respectively are_______, _______ and _______.
Answer» A uniform rod of mass 300 g and length 50 cm rotates at a uniform angular speed of 2 rad/s about an axis perpendicular to the rod through an end. The angular momentum of the rod about the axis of rotation, the speed of the centre of the rod and its kinetic energy respectively are_______, _______ and _______.

Discussion

328.	The only correct statement for the following electric circuit is:(1) The Voltmeter has been correctly connected in the circuit(2) The Ammeter has been correctly connected in the circuit(3) The Resistors R1 and R2 have been correctly connected in series(4) The Resistors R1 and R2 have been correctly connected in parallel
Answer» The only correct statement for the following electric circuit is: (1) The Voltmeter has been correctly connected in the circuit (2) The Ammeter has been correctly connected in the circuit (3) The Resistors R₁and R₂ have been correctly connected in series (4) The Resistors R₁ and R₂ have been correctly connected in parallel

Discussion

329.	4.A long straight hollow metallic tube carrying a current I has three sections of different area of cross section as shown in the figure. 3 points A B and C are on the line parallel to the axis of the tube if magnetic field at these points are B1 B2 and B3 respectively then what is the relation between B1 , B2 and B3
Answer» 4.A long straight hollow metallic tube carrying a current I has three sections of different area of cross section as shown in the figure. 3 points A B and C are on the line parallel to the axis of the tube if magnetic field at these points are B1 B2 and B3 respectively then what is the relation between B1 , B2 and B3

Discussion

330.	Which of the following has highest calorific value ? (A)Petrol (B) Coke (C) Natural gas (D) Kerosene
Answer» Which of the following has highest calorific value ? (A)Petrol (B) Coke (C) Natural gas (D) Kerosene

Discussion

331.	28.A ball is projected vertically upwards with a certain initial speed. Another ball of same mass is projected at an angle 60 with the vertical with the same initial speed. At highest points of their journey,the ratio of their potential energies will be- (a)1:1 (b)2:1 (c)3:2 (d)4:1
Answer» 28.A ball is projected vertically upwards with a certain initial speed. Another ball of same mass is projected at an angle 60 with the vertical with the same initial speed. At highest points of their journey,the ratio of their potential energies will be- (a)1:1 (b)2:1 (c)3:2 (d)4:1

Discussion

332.	The Bishnoi community of Rajasthan is associated with the conservation of: (a) coal and petroleum (b) forests and wildlife (c) water resources (d) abiotic environment
Answer» The Bishnoi community of Rajasthan is associated with the conservation of: (a) coal and petroleum (b) forests and wildlife (c) water resources (d) abiotic environment

Discussion

333.	Electric field lines always point away from a positive charge and towards a negative point. In fact, electric fields originate at a positive charge and terminate at a negative charge. Why and how this happens so?
Answer» Electric field lines always point away from a positive charge and towards a negative point. In fact, electric fields originate at a positive charge and terminate at a negative charge. Why and how this happens so?

Discussion

334.	1. What is equivalent resistance between A and C, B and C, and C and D in the arrangement of resistors shown in figure if resistance of each resistor is 6ohm.
Answer» 1. What is equivalent resistance between A and C, B and C, and C and D in the arrangement of resistors shown in figure if resistance of each resistor is 6ohm.

Discussion

335.	A wire of resistance 100 Ω is stretched so that its radius becomes half the initial value. What will be the new resistance of the wire?
Answer» A wire of resistance $100 Ω$ is stretched so that its radius becomes half the initial value. What will be the new resistance of the wire?

Discussion

336.	2.Two objects moving along the same straight line are leaving point A with initial velocities 2u and u and accelerations a and 2a respectively at t=0.The distance moved by the objects ,when one object overtakes the other ,w.r.t Point A is
Answer» 2.Two objects moving along the same straight line are leaving point A with initial velocities 2u and u and accelerations a and 2a respectively at t=0.The distance moved by the objects ,when one object overtakes the other ,w.r.t Point A is

Discussion

337.	What focal length should be the reading glasses of a person be for whom the least distance of distinct vision is 50 cm? ( The distance of normal vision is 25 cm)
Answer» What focal length should be the reading glasses of a person be for whom the least distance of distinct vision is 50 cm? ( The distance of normal vision is 25 cm)

Discussion

338.	For a prism of refracting angle A the maximum angle of deviation is known to be delta. Then to obtain an emergent ray the angle of incidence i has to be within A 0°
Answer» For a prism of refracting angle A the maximum angle of deviation is known to be delta. Then to obtain an emergent ray the angle of incidence i has to be within A 0°

Discussion

339.	A boy of mass 60kg carrying a bag of 20kg runs up a flight of 100 stairs 0.2m high each. Calculate the efficiency of the boy?
Answer» A boy of mass 60kg carrying a bag of 20kg runs up a flight of 100 stairs 0.2m high each. Calculate the efficiency of the boy?

Discussion

340.	body is in the state of equilibrium under effect of three forces of equal magnitude. The angle between any two forces is Options: Should have chosen Wrong
Answer» body is in the state of equilibrium under effect of three forces of equal magnitude. The angle between any two forces is Options: Should have chosen Wrong

Discussion

341.	A current of 1 A is drawn by the filament of an electrical bulb. The number of electrons passing through a cross-section of the filament in 16 s will be roughly -
Answer» A current of $1 A$ is drawn by the filament of an electrical bulb. The number of electrons passing through a cross-section of the filament in $16 s$ will be roughly -

Discussion

342.	The reduction in the allotted quantity of electricity to the consumer is known as
Answer» The reduction in the allotted quantity of electricity to the consumer is known as

Discussion

343.

In the circuit shown in figure, match the following. Table-1 Table-2 (A) Minimum current will flow through.(P) 2Ω(B) Maximum current will flow through.(Q) 4Ω(C) Maximum power will be genrated across.(R) 3Ω(A) Minimum power will be generated across.(S) 5Ω

Answer»

In the circuit shown in figure, match the following.

Table-1
Table-2

$(A)$ Minimum current will flow through.	$(P) 2 Ω$
$(B)$ Maximum current will flow through.	$(Q) 4 Ω$
$(C)$ Maximum power will be genrated across.	$(R) 3 Ω$
$(A)$ Minimum power will be generated across.	$(S) 5 Ω$

Discussion

344.	Resistance of each branch in the given figure is 1Ω. Equivalent resistance of circuit between point A and B is :
Answer» Resistance of each branch in the given figure is $1 Ω$ . Equivalent resistance of circuit between point A and B is :

Discussion

345.	What is the order of the seven colours (from most deviated to least deviated) that we see after dispersion through a glass prism?
Answer» What is the order of the seven colours (from most deviated to least deviated) that we see after dispersion through a glass prism?

Discussion

346.	What is the angle of deviation of a light ray when it enters from a rarer medium to a denser medium? Take angle of incidence = θ1 and angle of refraction = θ2.
Answer» What is the angle of deviation of a light ray when it enters from a rarer medium to a denser medium? Take angle of incidence = $θ_{1}$ and angle of refraction = $θ_{2}$ .

Discussion

347.	Magnetic field at a point x,y,z is given by B=By/{(x^2+y^{2 })}^{1/2}i-Bx/{(x^2+y^2)}^{1/2} Find Current enclosed in the loop
Answer» Magnetic field at a point x,y,z is given by B=By/{(x^2+y^{2 })}^{1/2}i-Bx/{(x^2+y^2)}^{1/2} Find Current enclosed in the loop

Discussion

348.	The value of 64 J energy is equal to
Answer» The value of $64 J$ energy is equal to

Discussion

349.	For two resistors R1 and R2 are connected in parallel find relative error in their equivalent resistance if R1 = [ 50+- 2] ohms R2 = [ 100 +- 3] ohm
Answer» For two resistors R1 and R2 are connected in parallel find relative error in their equivalent resistance if R1 = [ 50+- 2] ohms R2 = [ 100 +- 3] ohm

Discussion

350.	How does the refractive index of a transparent medium affect the speed of light passing through it?
Answer» How does the refractive index of a transparent medium affect the speed of light passing through it?

Discussion

Explore topic-wise InterviewSolutions in .

Why do we see stars mostly at night?

Which of the following statement is correct with respect to geothermal energy?

which will react with RMgX if -CN and -OCH3 are present on ring . how will we decide that orde

Which one of the following is not a renewable resource?

In a rocket, fuel burns at the rate of 2kg/s. This fuel gets ejected from the rocket with a relative velocity of 80km/s. Net force exerted on the rocket (just about to take off from ground) of mass 2000 kg is:-(1) 16,000 N, (2) 1,60,000 N, (3) 1,80,000 N, (4) 1,40,000N.

Why are the 'danger signal' lights red in colour ?

Light is a form of energy. Energy not be created nor be destroyed. When light ray falls on any surface some or more amount of light get absorb. How?

Why does a ray of light bend when it travels from one medium into another?

hybridisation of \lbrack ni\rbrack co4?

In a step-up transformer the number of turns, in the secondary coil are more than the number of turns in the primary coil. Thus the i) voltage and ii) current in the secondary coil is

A liquid drop of radius r moving with velocity v, collides with another drop of same liquid of radius 2r at rest. If the two drops combined together, then velocity of combined drop will be Options:a-v/3 b-v/6 c-v/9 d-v/12

How to calculate formal charge of SO3

What should be the length of the day, so that the weight of a body on the equator of earth becomes zero ?

A solenoid of 100 turns and having current of 5 A acts as a bar magnet having area of cross-section 0.1 cm2. Find the magnetic field at a point P situated at distance 0.5 m from the centre on its axis

Why is the image highly magnified when placed at the principal focus ?

24. Standard enthalpy of vapourisation for water at 10degree celcius is 40.66kJmol-the internal energy of vapourisaction of water at 100degree celcius

Examples of transverse wave and longitudinal wave

A part of a circuit is shown in figure. Here reading of ammeter is 5 A and voltmeter is 96 V &amp; voltmeter resistance is 480 Ω. Then find the resistance R

Two identical metal spheres carry charges of + q and - 2q respectively. When the spheres are separated bya large distance r, the force between them is F. Now the spheres are allowed to touch and then moved backto the same separation. Find the new force of repulsion between them.1.ас

find the potential energy of an electron in 1st excited state of Be3+ion

A rifle of mass 5 kg fires a bullet of mass 40 gm. The bullet leaves the barrel of the rifle with a velocity 200 ms. If the bullet takes 0.004 s to move through the barrel, calculate the recoil velocity of the rifle.

Flowing water can rotate a turbine. Which type of energy is used up by the turbine?

A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistances, which may be used separately, in series, or in parallel. What are the currents in the three cases?

A ray of light is incident to the hypotenuse of a right-angled prism after travelling parallel to the base inside the prism. If μ is the refractive index of the material of the prism, the maximum value of the base angle for which light is totally reflected from the hypotenuse is

Which of the following has highest calorific value ? (A)Petrol (B) Coke (C) Natural gas (D) Kerosene

28.A ball is projected vertically upwards with a certain initial speed. Another ball of same mass is projected at an angle 60 with the vertical with the same initial speed. At highest points of their journey,the ratio of their potential energies will be- (a)1:1 (b)2:1 (c)3:2 (d)4:1

The Bishnoi community of Rajasthan is associated with the conservation of: (a) coal and petroleum (b) forests and wildlife (c) water resources (d) abiotic environment

Electric field lines always point away from a positive charge and towards a negative point. In fact, electric fields originate at a positive charge and terminate at a negative charge. Why and how this happens so?

1. What is equivalent resistance between A and C, B and C, and C and D in the arrangement of resistors shown in figure if resistance of each resistor is 6ohm.

A wire of resistance 100 Ω is stretched so that its radius becomes half the initial value. What will be the new resistance of the wire?

2.Two objects moving along the same straight line are leaving point A with initial velocities 2u and u and accelerations a and 2a respectively at t=0.The distance moved by the objects ,when one object overtakes the other ,w.r.t Point A is

What focal length should be the reading glasses of a person be for whom the least distance of distinct vision is 50 cm? ( The distance of normal vision is 25 cm)

For a prism of refracting angle A the maximum angle of deviation is known to be delta. Then to obtain an emergent ray the angle of incidence i has to be within A 0°

A boy of mass 60kg carrying a bag of 20kg runs up a flight of 100 stairs 0.2m high each. Calculate the efficiency of the boy?

body is in the state of equilibrium under effect of three forces of equal magnitude. The angle between any two forces is Options: Should have chosen Wrong

A current of 1 A is drawn by the filament of an electrical bulb. The number of electrons passing through a cross-section of the filament in 16 s will be roughly -

The reduction in the allotted quantity of electricity to the consumer is known as

In the circuit shown in figure, match the following. Table-1 Table-2 (A) Minimum current will flow through.(P) 2Ω(B) Maximum current will flow through.(Q) 4Ω(C) Maximum power will be genrated across.(R) 3Ω(A) Minimum power will be generated across.(S) 5Ω

Resistance of each branch in the given figure is 1Ω. Equivalent resistance of circuit between point A and B is :

What is the order of the seven colours (from most deviated to least deviated) that we see after dispersion through a glass prism?

What is the angle of deviation of a light ray when it enters from a rarer medium to a denser medium? Take angle of incidence = θ1 and angle of refraction = θ2.

Magnetic field at a point x,y,z is given by B=By/{(x^2+y^{2 })}^{1/2}i-Bx/{(x^2+y^2)}^{1/2} Find Current enclosed in the loop

The value of 64 J energy is equal to

For two resistors R1 and R2 are connected in parallel find relative error in their equivalent resistance if R1 = [ 50+- 2] ohms R2 = [ 100 +- 3] ohm

How does the refractive index of a transparent medium affect the speed of light passing through it?

A part of a circuit is shown in figure. Here reading of ammeter is 5 A and voltmeter is 96 V & voltmeter resistance is 480 Ω. Then find the resistance R