13232 + Interview Questions in Physics Page 62 InterviewSolution

3051.	An electric bulb 60W is used 6 hours per day. Calculate the units of energy consumed in a day.
Answer» An electric bulb 60W is used 6 hours per day. Calculate the units of energy consumed in a day.

Discussion

3052.	A circular current carrying loop is an equivalent to a magnetic dipole. Now a point on the axis of the loop is 1) a broad side on position 2) an end on position 3) both 1 and 2 4) neither 1 amd 2
Answer» A circular current carrying loop is an equivalent to a magnetic dipole. Now a point on the axis of the loop is 1) a broad side on position 2) an end on position 3) both 1 and 2 4) neither 1 amd 2

Discussion

3053.	A scalene triangular lamina of uniform mass density and negligible thickness has one of its vertices at the origin. The position vectors of its other two vertices are →a and →b . The location of its centre of mass will be
Answer» A scalene triangular lamina of uniform mass density and negligible thickness has one of its vertices at the origin. The position vectors of its other two vertices are $\to a$ and $\to b$ . The location of its centre of mass will be

Discussion

3054.	A constant force acting on an object of 5 kg for a period of 10 second increases the velocity of an object from 3 metre per second to 7 M per second find the magnitude of the applied force now if the force be applied for a period of 5 second what would be the final velocity of the object? explain in easy manner
Answer» A constant force acting on an object of 5 kg for a period of 10 second increases the velocity of an object from 3 metre per second to 7 M per second find the magnitude of the applied force now if the force be applied for a period of 5 second what would be the final velocity of the object? explain in easy manner

Discussion

3055.	describe kirchoff's law.
Answer» describe kirchoff's law.

Discussion

3056.	When a bar magnet is kept perpendicular to earth's magnetic field then why only 2 neutral points are obtained as there seems to be more than 2 neutral points.
Answer» When a bar magnet is kept perpendicular to earth's magnetic field then why only 2 neutral points are obtained as there seems to be more than 2 neutral points.

Discussion

3057.	A car travelling at a speed of 30km/h is brought to rest in a distance of 8m by applyingbbrakes. if the same car is moving ay a speed of 60km/h then it can be brought to rest with same brakes in
Answer» A car travelling at a speed of 30km/h is brought to rest in a distance of 8m by applyingbbrakes. if the same car is moving ay a speed of 60km/h then it can be brought to rest with same brakes in

Discussion

3058.	What is vander Waal force
Answer» What is vander Waal force

Discussion

3059.	A rod of lenght L is held vertically on a smooth horizontal surface.The top end of rod is given a gentle push.At a certain ins†an t of time, when rod makes an angle 37 degree witb horizontal the velocity of COM of rod is 2m/s.Find velocity of end of rod in contact wirh the surface at that ins†an t.
Answer» A rod of lenght L is held vertically on a smooth horizontal surface.The top end of rod is given a gentle push.At a certain ins†an t of time, when rod makes an angle 37 degree witb horizontal the velocity of COM of rod is 2m/s.Find velocity of end of rod in contact wirh the surface at that ins†an t.

Discussion

3060.	For the graph given below choose the correct option :Table ATable Ba) Line Ai) Accelerated Motionb) Line Bii) Constant velocity (high magnitude)c) Curve Ciii) At restd) Line Eiv) Constant Velocity (low magnitude)
Answer» For the graph given below choose the correct option : $\begin{matrix} Table A & Table B a) Line A & i) Accelerated Motion b) Line B & i i) Constant velocity (high magnitude) c) Curve C & i i i) At rest d) Line E & i v) Constant Velocity (low magnitude) \end{matrix}$

3060.

For the graph given below choose the correct option :Table ATable Ba) Line Ai) Accelerated Motionb) Line Bii) Constant velocity (high magnitude)c) Curve Ciii) At restd) Line Eiv) Constant Velocity (low magnitude)

Answer»

For the graph given below choose the correct option :

$\begin{matrix} Table A & Table B a) Line A & i) Accelerated Motion b) Line B & i i) Constant velocity (high magnitude) c) Curve C & i i i) At rest d) Line E & i v) Constant Velocity (low magnitude) \end{matrix}$

Discussion

3061.	Where are the magnetic north and south poles of earth located
Answer» Where are the magnetic north and south poles of earth located

Discussion

3062.	106. A man is moving with velocity 6 m/s towards east experiences that is falling vertically down if he increases his speed to 12 m/s. Now if he experiences the rain at 37 degree with vertical.Then find real velocity of rain?
Answer» 106. A man is moving with velocity 6 m/s towards east experiences that is falling vertically down if he increases his speed to 12 m/s. Now if he experiences the rain at 37 degree with vertical.Then find real velocity of rain?

Discussion

3063.	A ball of mass 200 g falls from a height of 5 metres. What is the kinetic energy when it just reaches the ground? (g = 9.8 m/s2).
Answer» A ball of mass 200 g falls from a height of 5 metres. What is the kinetic energy when it just reaches the ground? (g = 9.8 $m / s^{2}$ ).

Discussion

3064.	When did Dalton's theory was published
Answer» When did Dalton's theory was published

Discussion

3065.	In the glass slab experiment, a student measures the angle of incidence (∠i) in air and finds it to be 40°. He also measured the corresponding angle of refraction as well as the angle of emergence for this ray of light but lost their record. The most likely record of readings for the angle of refraction and angle of emergence will be:(1) ∠r = 40° and ∠e = 50°(2) ∠r > 40° and ∠e = 40°(3) ∠r = 50° and ∠e = 40°(4) ∠r < 40° and ∠e = 40°
Answer» In the glass slab experiment, a student measures the angle of incidence (∠i) in air and finds it to be 40°. He also measured the corresponding angle of refraction as well as the angle of emergence for this ray of light but lost their record. The most likely record of readings for the angle of refraction and angle of emergence will be: (1) ∠r = 40° and ∠e = 50° (2) ∠r > 40° and ∠e = 40° (3) ∠r = 50° and ∠e = 40° (4) ∠r < 40° and ∠e = 40°

Discussion

3066.	variation of gravitational field due to rotation of eart
Answer» variation of gravitational field due to rotation of eart

Discussion

3067.

Complete the table:A. m (kg) v (m/s) p = mv (kgm/s) 85 60 ……… ……… 2.5 6.25 B. m (kg) v (m/s2) F = ma (N) 25 1.2 ……… 1.5 ……… 2.25

Answer»

Complete the table:

A.

m (kg)	v (m/s)	p = mv (kgm/s)
85	60	………
………	2.5	6.25

B.

m (kg)	v (m/s²)	F = ma (N)
25	1.2	………
1.5	………	2.25

Discussion

3068.	Aconvex lens of focal length 20 produces a virtual and erect image of object placed 40cm from the lens. Find the magnification.
Answer» Aconvex lens of focal length 20 produces a virtual and erect image of object placed 40cm from the lens. Find the magnification.

Discussion

3069.	State the conservation of momentum for 5 marks
Answer» State the conservation of momentum for 5 marks

Discussion

3070.	our Results For A man goes from city X to the city Y and returns to the city X on his motor bike. The distance between the two cities is 260km and the man takes 4 hours 20min to complete his journey. Find his average speed and average velocity in km/h.
Answer» our Results For A man goes from city X to the city Y and returns to the city X on his motor bike. The distance between the two cities is 260km and the man takes 4 hours 20min to complete his journey. Find his average speed and average velocity in km/h.

3070.

our Results For A man goes from city X to the city Y and returns to the city X on his motor bike. The distance between the two cities is 260km and the man takes 4 hours 20min to complete his journey. Find his average speed and average velocity in km/h.

Answer»

our Results For

A man goes from city X to the city Y and returns to the city X on his motor bike. The distance between the two cities is 260km and the man takes 4 hours 20min to complete his journey. Find his average speed and average velocity in km/h.

Discussion

3071.	A wave travelling along a string is described by y (x,t)=0.005 sin(95.0x-4.0t) what would be its angular wave number, k and wavelength, λ?
Answer» A wave travelling along a string is described by y (x,t)=0.005 sin(95.0x-4.0t) what would be its angular wave number, k and wavelength, λ?

3071.

A wave travelling along a string is described by y (x,t)=0.005 sin(95.0x-4.0t) what would be its angular wave number, k and wavelength, λ?

Answer»

A wave travelling along a string is described by
y (x,t)=0.005 sin(95.0x-4.0t)

what would be its angular wave number, k and wavelength, λ?

Discussion

3072.	Find the velocity of image of point object P (in cm/s) formed by the plane mirror :
Answer» Find the velocity of image of point object P $(in cm/s)$ formed by the plane mirror :

Discussion

3073.	[ neglect brackets mis typed(A) 7.2 x 10 w (B) 4.5 x 105 w (C) 1.8 x 105 w (D) 0.9x 105 w 21.]The density of a metal at normal pressure is p.Its density when it is subjected to an excess}pressur e p is p'. If B is bulk modulus of the metal, the ratio of P/p'(P S)is}explain itv in detail with so9lution
Answer» [ neglect brackets mis typed(A) 7.2 x 10 w (B) 4.5 x 105 w (C) 1.8 x 105 w (D) 0.9x 105 w 21.]The density of a metal at normal pressure is p.Its density when it is subjected to an excess}pressur e p is p'. If B is bulk modulus of the metal, the ratio of P/p'(P S)is}explain itv in detail with so9lution

Discussion

3074.	If time period of earth is calculated by 2π√R/G then earths rotational time is 84.6 and the mass will feel weightless as g=0 then what will be the formula to calculate time period on earth of time 24 hrs and what will be value of g of that object
Answer» If time period of earth is calculated by 2π√R/G then earths rotational time is 84.6 and the mass will feel weightless as g=0 then what will be the formula to calculate time period on earth of time 24 hrs and what will be value of g of that object

Discussion

3075.	Weight of an object is ___.
Answer» Weight of an object is ___.

Discussion

3076.	A particle is moving in a circular path of radius r, the displacement after half a circle would be
Answer» A particle is moving in a circular path of radius r, the displacement after half a circle would be

Discussion

3077.	What is the mass of the planet that has a satellite whose time period is T and orbit radius is r?[Assume, satellite revolves around the planet in a circular orbit]
Answer» What is the mass of the planet that has a satellite whose time period is $T$ and orbit radius is $r$ ? [Assume, satellite revolves around the planet in a circular orbit]

Discussion

3078.	explain about hess law of summation
Answer» explain about hess law of summation

Discussion

3079.	36.if relation between accleration and time for an object is given by a=2t+4t² calculate the position of object from origin at t=4
Answer» 36.if relation between accleration and time for an object is given by a=2t+4t² calculate the position of object from origin at t=4

Discussion

3080.	Four beakers are labelled as P, Q, R and S. A student puts salt solutions of different concentrations in the four beakers without noting which beaker contains solution of which concentration. A solid suspended from the hook of a spring balance gives a reading of 150g in air. When this solid, while still suspended from the hook of spring balance, is fully immersed in beakers P, Q, R, and S, the readings shown by the spring balance in the four beakers P, Q, R and S are 110g, 130g, 140g and 120g respectively. The most concentrated solution is contained in the beaker labelled as :(1) P(2) Q(3) R(4) S
Answer» Four beakers are labelled as P, Q, R and S. A student puts salt solutions of different concentrations in the four beakers without noting which beaker contains solution of which concentration. A solid suspended from the hook of a spring balance gives a reading of 150g in air. When this solid, while still suspended from the hook of spring balance, is fully immersed in beakers P, Q, R, and S, the readings shown by the spring balance in the four beakers P, Q, R and S are 110g, 130g, 140g and 120g respectively. The most concentrated solution is contained in the beaker labelled as : (1) P (2) Q (3) R (4) S

Discussion

3081.	is a real inverted and enlarged image always formed by concave mirror?
Answer» is a real inverted and enlarged image always formed by concave mirror?

Discussion

3082.	If radius of earth contracted by 0 1%. itswill increase by6.mass remaining same, then weight of the body at earth's surface
Answer» If radius of earth contracted by 0 1%. itswill increase by6.mass remaining same, then weight of the body at earth's surface

Discussion

3083.	ntA wheel starting from rest is uniformly accelerated at 2 rad/s2 for 20s .It allowed to rotate uniformly for the next 10s and finally brought to rest in next 20s. the total angle rotated by the wheel in radian isn nt(1) 600n nt(2)1200n nt(3)1800n nt(4) 300n
Answer» ntA wheel starting from rest is uniformly accelerated at 2 rad/s2 for 20s .It allowed to rotate uniformly for the next 10s and finally brought to rest in next 20s. the total angle rotated by the wheel in radian isn nt(1) 600n nt(2)1200n nt(3)1800n nt(4) 300n

Discussion

3084.	Why don't we use sign convention in writing v, u , f , R1 , R2 , while deriving lens maker's fromula ?
Answer» Why don't we use sign convention in writing v, u , f , R1 , R2 , while deriving lens maker's fromula ?

Discussion

3085.	When an apple falls freely from the tree towards the ground, its total energy:
Answer» When an apple falls freely from the tree towards the ground, its total energy:

Discussion

3086.	Why do bodies possessing mass have gravitational attraction of their own?
Answer» Why do bodies possessing mass have gravitational attraction of their own?

Discussion

3087.	In a steam power plant operating on the Rankine cycle, steam enters the turbine at 4 MPa, 350oC and exists at a pressure of 15 kPa. Then it enters the condenser and exists as saturated water. Next, a pump feeds back the water to the boiler. The adiabatic efficiency of the turbine is 90%. The thermodynamic states of water and steam are given in the table. h is specific enthalpy, s is specific entropy and v the specific volume; subscript f and g denote saturated liquid state and saturated vapour state. The net work output kJk−1 of the cycle is
Answer» In a steam power plant operating on the Rankine cycle, steam enters the turbine at $4$ MPa, $350^{o} C$ and exists at a pressure of $15$ kPa. Then it enters the condenser and exists as saturated water. Next, a pump feeds back the water to the boiler. The adiabatic efficiency of the turbine is $90$ %. The thermodynamic states of water and steam are given in the table. h is specific enthalpy, s is specific entropy and v the specific volume; subscript f and g denote saturated liquid state and saturated vapour state. The net work output $k J k^{-} 1$ of the cycle is

Discussion

3088.	Ball A of mass 5 kg travelling at 6 ms−1collides with another ball B of mass 2 kg travelling at 2 ms−1 in the same direction. After collision, the velocity of ball A reduces to 2 ms−1. Calculate the velocity of ball B after the collision.
Answer» Ball A of mass $5 k g$ travelling at $6 m s^{- 1}$ collides with another ball B of mass $2 k g$ travelling at $2 m s^{- 1}$ in the same direction. After collision, the velocity of ball A reduces to $2 m s^{- 1}$ . Calculate the velocity of ball B after the collision.

Discussion

3089.	A siphon tube is discharging a liquid of specific gravity 0.9 from a reservoir as shown in the figure. The velocity of the liquid coming out through the siphon is(Take g=10 m/s2)
Answer» A siphon tube is discharging a liquid of specific gravity $0.9$ from a reservoir as shown in the figure. The velocity of the liquid coming out through the siphon is (Take $g = 10 {m/s}^{2}$ )

Discussion

3090.	A fielder drags his hands towards him gradually along with the moving ball while taking a catch. What is the reason of this?
Answer» A fielder drags his hands towards him gradually along with the moving ball while taking a catch. What is the reason of this?

Discussion

3091.	A body A is projected vertically upwards. Anotherbody B of same mass is projected at an angle of60° with the horizontal. If both the bodies attainsame maximum height, then ratio of initial kineticenergy of body A to that of body B is
Answer» A body A is projected vertically upwards. Another body B of same mass is projected at an angle of 60° with the horizontal. If both the bodies attain same maximum height, then ratio of initial kinetic energy of body A to that of body B is

Discussion

3092.	40. An astronaut orbiting in a spaceship round the earth has a centripetal acceleration of 2.45m/s. The height of spaceship from earth surface is (R= radius of earth)
Answer» 40. An astronaut orbiting in a spaceship round the earth has a centripetal acceleration of 2.45m/s. The height of spaceship from earth surface is (R= radius of earth)

Discussion

3093.	the position x of a particle with time wrt time along x axis is given by x=9t2-t3 what willl be the position of this particle when it achieves max speed
Answer» the position x of a particle with time wrt time along x axis is given by x=9t2-t3 what willl be the position of this particle when it achieves max speed

Discussion

3094.	A man lifts a luggage of 10kg from the ground and puts it on his head 1.7m above the ground. Calculate work done by him on the luggage. Take acceleration due to gravity=10ms−2.
Answer» A man lifts a luggage of $10 k g$ from the ground and puts it on his head $1.7 m$ above the ground. Calculate work done by him on the luggage. Take acceleration due to gravity $= 10 m s^{- 2}$ .

Discussion

3095.	A person sitting on the ground floor of a building notices through the window, of height 1.5 m, a ball dropped from the roof of the building and crosses the window in 0.1 s. What is the velocity of the ball when it is at the topmost point of the window? (g-10 m/s2)(1) 20 m/s(2) 15.5 m/s(3) 14.5 m/s(4) 4.5 m/s
Answer» A person sitting on the ground floor of a building notices through the window, of height 1.5 m, a ball dropped from the roof of the building and crosses the window in 0.1 s. What is the velocity of the ball when it is at the topmost point of the window? (g-10 m/ $s^{2}$ ) (1) 20 m/s (2) 15.5 m/s (3) 14.5 m/s (4) 4.5 m/s

3095.

A person sitting on the ground floor of a building notices through the window, of height 1.5 m, a ball dropped from the roof of the building and crosses the window in 0.1 s. What is the velocity of the ball when it is at the topmost point of the window? (g-10 m/s2)(1) 20 m/s(2) 15.5 m/s(3) 14.5 m/s(4) 4.5 m/s

Answer»

A person sitting on the ground floor of a building notices through the window, of height 1.5 m, a ball dropped from the roof of the building and crosses the window in 0.1 s. What is the velocity of the ball when it is at the topmost point of the window? (g-10 m/ $s^{2}$ )

(1) 20 m/s

(2) 15.5 m/s

(3) 14.5 m/s

(4) 4.5 m/s

Discussion

3096.	A runner completes one round of a circular track of diameter 400 m in 40 s. What will be the distance covered and the displacement respectively at the end of 2 minutes 20 s?
Answer» A runner completes one round of a circular track of diameter 400 m in 40 s. What will be the distance covered and the displacement respectively at the end of 2 minutes 20 s?

Discussion

3097.	Give reason for why does iron bar sinks in water whereas plastic floats on water
Answer» Give reason for why does iron bar sinks in water whereas plastic floats on water

Discussion

3098.	9. A ball is released from the top of a tower of height 100m. It takes T seconds to reach the ground. The position of the ball in first T/2 seconds from the ground is
Answer» 9. A ball is released from the top of a tower of height 100m. It takes T seconds to reach the ground. The position of the ball in first T/2 seconds from the ground is

Discussion

3099.	man sitting on a swing which ismoving to an angle of 60^° from thevertical is blowing a whistle which has afrequency of 2.0 k Hz. The whistle is 2.0m from the fixed support point of theswing. A sound detector which detectsthe whistle sound is kept in front of theswing. The maximum frequency thesound detector detected is(a) 2.027 kHz(c) 9.74 kHz(b) 1.974 kHz(d) 1.011 kHz
Answer» man sitting on a swing which ismoving to an angle of 60^° from thevertical is blowing a whistle which has afrequency of 2.0 k Hz. The whistle is 2.0m from the fixed support point of theswing. A sound detector which detectsthe whistle sound is kept in front of theswing. The maximum frequency thesound detector detected is(a) 2.027 kHz(c) 9.74 kHz(b) 1.974 kHz(d) 1.011 kHz

Discussion

3100.	why is 2 the n factor of H_3PO_{4 }
Answer» why is 2 the n factor of H_3PO_{4 }

Discussion

Explore topic-wise InterviewSolutions in .

An electric bulb 60W is used 6 hours per day. Calculate the units of energy consumed in a day.

A circular current carrying loop is an equivalent to a magnetic dipole. Now a point on the axis of the loop is 1) a broad side on position 2) an end on position 3) both 1 and 2 4) neither 1 amd 2

A scalene triangular lamina of uniform mass density and negligible thickness has one of its vertices at the origin. The position vectors of its other two vertices are →a and →b . The location of its centre of mass will be

describe kirchoff's law.

When a bar magnet is kept perpendicular to earth's magnetic field then why only 2 neutral points are obtained as there seems to be more than 2 neutral points.

A car travelling at a speed of 30km/h is brought to rest in a distance of 8m by applyingbbrakes. if the same car is moving ay a speed of 60km/h then it can be brought to rest with same brakes in

What is vander Waal force

For the graph given below choose the correct option :Table ATable Ba) Line Ai) Accelerated Motionb) Line Bii) Constant velocity (high magnitude)c) Curve Ciii) At restd) Line Eiv) Constant Velocity (low magnitude)

Where are the magnetic north and south poles of earth located

106. A man is moving with velocity 6 m/s towards east experiences that is falling vertically down if he increases his speed to 12 m/s. Now if he experiences the rain at 37 degree with vertical.Then find real velocity of rain?

A ball of mass 200 g falls from a height of 5 metres. What is the kinetic energy when it just reaches the ground? (g = 9.8 m/s2).

When did Dalton's theory was published

variation of gravitational field due to rotation of eart

Complete the table:A. m (kg) v (m/s) p = mv (kgm/s) 85 60 ……… ……… 2.5 6.25 B. m (kg) v (m/s2) F = ma (N) 25 1.2 ……… 1.5 ……… 2.25

Aconvex lens of focal length 20 produces a virtual and erect image of object placed 40cm from the lens. Find the magnification.

State the conservation of momentum for 5 marks

our Results For A man goes from city X to the city Y and returns to the city X on his motor bike. The distance between the two cities is 260km and the man takes 4 hours 20min to complete his journey. Find his average speed and average velocity in km/h.

A wave travelling along a string is described by y (x,t)=0.005 sin(95.0x-4.0t) what would be its angular wave number, k and wavelength, λ?

Find the velocity of image of point object P (in cm/s) formed by the plane mirror :

If time period of earth is calculated by 2π√R/G then earths rotational time is 84.6 and the mass will feel weightless as g=0 then what will be the formula to calculate time period on earth of time 24 hrs and what will be value of g of that object

Weight of an object is ___.

A particle is moving in a circular path of radius r, the displacement after half a circle would be

What is the mass of the planet that has a satellite whose time period is T and orbit radius is r?[Assume, satellite revolves around the planet in a circular orbit]

explain about hess law of summation

36.if relation between accleration and time for an object is given by a=2t+4t² calculate the position of object from origin at t=4

is a real inverted and enlarged image always formed by concave mirror?

If radius of earth contracted by 0 1%. itswill increase by6.mass remaining same, then weight of the body at earth's surface

ntA wheel starting from rest is uniformly accelerated at 2 rad/s2 for 20s .It allowed to rotate uniformly for the next 10s and finally brought to rest in next 20s. the total angle rotated by the wheel in radian isn nt(1) 600n nt(2)1200n nt(3)1800n nt(4) 300n

Why don't we use sign convention in writing v, u , f , R1 , R2 , while deriving lens maker's fromula ?

When an apple falls freely from the tree towards the ground, its total energy:

Why do bodies possessing mass have gravitational attraction of their own?

Ball A of mass 5 kg travelling at 6 ms−1collides with another ball B of mass 2 kg travelling at 2 ms−1 in the same direction. After collision, the velocity of ball A reduces to 2 ms−1. Calculate the velocity of ball B after the collision.

A siphon tube is discharging a liquid of specific gravity 0.9 from a reservoir as shown in the figure. The velocity of the liquid coming out through the siphon is(Take g=10 m/s2)

A fielder drags his hands towards him gradually along with the moving ball while taking a catch. What is the reason of this?

A body A is projected vertically upwards. Anotherbody B of same mass is projected at an angle of60° with the horizontal. If both the bodies attainsame maximum height, then ratio of initial kineticenergy of body A to that of body B is

40. An astronaut orbiting in a spaceship round the earth has a centripetal acceleration of 2.45m/s. The height of spaceship from earth surface is (R= radius of earth)

the position x of a particle with time wrt time along x axis is given by x=9t2-t3 what willl be the position of this particle when it achieves max speed

A man lifts a luggage of 10kg from the ground and puts it on his head 1.7m above the ground. Calculate work done by him on the luggage. Take acceleration due to gravity=10ms−2.

A runner completes one round of a circular track of diameter 400 m in 40 s. What will be the distance covered and the displacement respectively at the end of 2 minutes 20 s?

Give reason for why does iron bar sinks in water whereas plastic floats on water

9. A ball is released from the top of a tower of height 100m. It takes T seconds to reach the ground. The position of the ball in first T/2 seconds from the ground is

why is 2 the n factor of H_3PO_{4 }