13232 + Interview Questions in Physics Page 66 InterviewSolution

3251.	Total internal reflection of light can occur when light travels from __________.
Answer» Total internal reflection of light can occur when light travels from __________.

Discussion

3252.	A man firs a gun and hears its echo after 5 s. The man then moves 310 m towards the hill and fires his gun again. This time if he hears the echo after 3s. Calculate the speed of sound.
Answer» A man firs a gun and hears its echo after 5 s. The man then moves 310 m towards the hill and fires his gun again. This time if he hears the echo after 3s. Calculate the speed of sound.

Discussion

3253.	Among which of the following situations the object(s) is/are in free fall?1. An object dropped from a certain height.2. An object is thrown upward or a person jumping off the ground.3. Flying in a aircraft.4. A car accelerating at 9.8 ms−2in the road.
Answer» Among which of the following situations the object(s) is/are in free fall? 1. An object dropped from a certain height. 2. An object is thrown upward or a person jumping off the ground. 3. Flying in a aircraft. 4. A car accelerating at $9.8 m s^{- 2}$ in the road.

3253.

Among which of the following situations the object(s) is/are in free fall?1. An object dropped from a certain height.2. An object is thrown upward or a person jumping off the ground.3. Flying in a aircraft.4. A car accelerating at 9.8 ms−2in the road.

Answer»

Among which of the following situations the object(s) is/are in free fall?

1. An object dropped from a certain height.

2. An object is thrown upward or a person jumping off the ground.

3. Flying in a aircraft.

4. A car accelerating at $9.8 m s^{- 2}$ in the road.

Discussion

3254.	A potential divider is used to give outputs of 2 V and 3 V from a 5 V source as shown in figure. Which combination of resistances, R1, R2 and R3 will give the correct voltage as mentioned in the figure?
Answer» A potential divider is used to give outputs of $2 V$ and $3 V$ from a $5 V$ source as shown in figure. Which combination of resistances, $R_{1}, R_{2}$ and $R_{3}$ will give the correct voltage as mentioned in the figure?

Discussion

3255.	An aircraft with a wingspan of 40 m flies with a speed of 1080 km / hr in the eastward direction at a constant altitude in the northern hemisphere, where the vertical component of the earth’s magnetic field 1.75×10−5T. Then the emf developed between the tips of the wings is
Answer» An aircraft with a wingspan of 40 m flies with a speed of 1080 km / hr in the eastward direction at a constant altitude in the northern hemisphere, where the vertical component of the earth’s magnetic field $1.75 \times 10^{- 5} T$ . Then the emf developed between the tips of the wings is

Discussion

3256.	in a rocket , fuel burns at the rate of 2kg/s. this fuel gets ejected from the rocket with a velocity of 80km/s . force exerted on the rocket is
Answer» in a rocket , fuel burns at the rate of 2kg/s. this fuel gets ejected from the rocket with a velocity of 80km/s . force exerted on the rocket is

Discussion

3257.	Ifλ=A + Bx, determine the position of its centre of mass.If the linear density of a rod of length L varies as λ(where x is the distance from one of its ends)
Answer» Ifλ=A + Bx, determine the position of its centre of mass.If the linear density of a rod of length L varies as λ(where x is the distance from one of its ends)

Discussion

3258.	A pulley of radius 2 m is rotated about its axisby a force F = (20t-5t2) newton (where t ismeasured in seconds) applied tangentially.If the moment of inertia of the pulley aboutits axis of rotation is 10 kg m2, the numberof rotations made by the pulley before itsdirection of motion is reversed, is(1) more than 6 but less than 92 more than 9(3) less than 3(4) more than 3 but less than 6
Answer» A pulley of radius 2 m is rotated about its axisby a force F = (20t-5t2) newton (where t ismeasured in seconds) applied tangentially.If the moment of inertia of the pulley aboutits axis of rotation is 10 kg m2, the numberof rotations made by the pulley before itsdirection of motion is reversed, is(1) more than 6 but less than 92 more than 9(3) less than 3(4) more than 3 but less than 6

Discussion

3259.	A U - tube is partially filled with water. Oil which does not mix with water is next poured into one side until water rises by 25 cm on the other side. If the density of oil is 0.8, the oil level will stand higher than the water level by
Answer» A $U - tube$ is partially filled with water. Oil which does not mix with water is next poured into one side until water rises by $25 cm$ on the other side. If the density of oil is $0.8$ , the oil level will stand higher than the water level by

Discussion

3260.	Draw a neat and labelled diagram of a screw gauge. Name its main parts and state their functions.
Answer» Draw a neat and labelled diagram of a screw gauge. Name its main parts and state their functions.

Discussion

3261.	Two mirrors are inclined at an angle θ. For an object placed along the angular bisector of the two mirrors, 11 images are noticed. Find the angle between the mirrors :
Answer» Two mirrors are inclined at an angle $θ$ . For an object placed along the angular bisector of the two mirrors, $11$ images are noticed. Find the angle between the mirrors :

Discussion

3262.	A small steel ball of radius r is allowed to fall under gravity through a column of a viscous liquid of coefficient of viscosity η . After some time the velocity of the ball attains a constant value known as terminal velocity vr. The terminal velocity depends on (i) the mass of the ball m, (ii) η, (iii) r and (iv) acceleration due to gravity g . Which of the following relations is dimensionally correct
Answer» A small steel ball of radius $r$ is allowed to fall under gravity through a column of a viscous liquid of coefficient of viscosity $η$ . After some time the velocity of the ball attains a constant value known as terminal velocity $v_{r}$ . The terminal velocity depends on $(i)$ the mass of the ball $m, (i i) η, (i i i) r a n d (i v)$ acceleration due to gravity $g$ . Which of the following relations is dimensionally correct

Discussion

3263.	The acceleration of a particle moving in a straight line varies with time as a = 3 t square, where a and t are in SI units. The position of the particle at t=0 s is 2 m and initial velocity is 2 m/s. The displacement of the particle at t= 2 s is
Answer» The acceleration of a particle moving in a straight line varies with time as a = 3 t square, where a and t are in SI units. The position of the particle at t=0 s is 2 m and initial velocity is 2 m/s. The displacement of the particle at t= 2 s is

Discussion

3264.	Is the horizontal intensity of earths magnetic field a constant?
Answer» Is the horizontal intensity of earths magnetic field a constant?

Discussion

3265.	Which of the following factors does not influence the amount of work done?
Answer» Which of the following factors does not influence the amount of work done?

Discussion

3266.	A spring of force cons†an t 600 Nm 1 is mounted on a horizontal table. A mass of 1.5 kg is attached to the free end of the spring, pulled sideways to a dis†an ce of 2 cm and released. The speed of the mass when the spring is compressed by 1 cm is
Answer» A spring of force cons†an t 600 Nm 1 is mounted on a horizontal table. A mass of 1.5 kg is attached to the free end of the spring, pulled sideways to a dis†an ce of 2 cm and released. The speed of the mass when the spring is compressed by 1 cm is

Discussion

3267.	The relation between current in a conductor and time is shown in the figure.(i) The total charge flowing through the conductor is[1 Mark]
Answer» The relation between current in a conductor and time is shown in the figure. $(i)$ The total charge flowing through the conductor is $[$ 1 Mark $]$

Discussion

3268.	If for the given circuit capacitive reactance is two times of inductive reactance, and resistance R is equal to inductive reactance then, the power factor of the circuit is,
Answer» If for the given circuit capacitive reactance is two times of inductive reactance, and resistance $R$ is equal to inductive reactance then, the power factor of the circuit is,

Discussion

3269.	What is the difference between kw (kilo watt) and kwh (kilo watt hour).
Answer» What is the difference between kw (kilo watt) and kwh (kilo watt hour).

Discussion

3270.	A ball is dropped from rest from a height of 15 m. What is the time taken for it to reach the ground? Take g=10 m s−2.
Answer» A ball is dropped from rest from a height of $15 m$ . What is the time taken for it to reach the ground? Take $g = 10 m s^{- 2}$ .

Discussion

3271.	Till what maximum distance. We can place the image which can be seen in the concave mirror
Answer» Till what maximum distance. We can place the image which can be seen in the concave mirror

Discussion

3272.	A cubical of wood of side 30cm weighting 21.6kg floats on water with two faces horizontal .Calculate the depth of immersion of wood
Answer» A cubical of wood of side 30cm weighting 21.6kg floats on water with two faces horizontal .Calculate the depth of immersion of wood

Discussion

3273.	A body weighs 250 N on the surface of the earth. How much it weighs half way down to the centre of the earth ?
Answer» A body weighs $250 N$ on the surface of the earth. How much it weighs half way down to the centre of the earth ?

Discussion

3274.	11C undergoes β+ decay to 11B. What is the maximum energy a positron emitted in the process can possess?Atomic masses: 11C:11.0114 u; 11B:11.0093 u; e−: 0.005486. c2=931MeVu.
Answer» $^{11} C$ undergoes $β^{+}$ decay to $^{11} B .$ What is the maximum energy a positron emitted in the process can possess? Atomic masses: $^{11} C : 11.0114 u;^{11} B : 11.0093 u; e^{-} : 0.005486. c^{2} = 931 \frac{M e V}{u}$ .

Discussion

3275.	Find the equivalent resistance between A and B.
Answer» Find the equivalent resistance between $A$ and $B$ .

Discussion

3276.	a capillary tube is dipped in water and it is 20 cm outside water. the water rises upto 8 cm . if the entire arrangement is put in freely falling elevator the length of water column in the capillary tube will be ??
Answer» a capillary tube is dipped in water and it is 20 cm outside water. the water rises upto 8 cm . if the entire arrangement is put in freely falling elevator the length of water column in the capillary tube will be ??

Discussion

3277.	What height of water column will exert the pressure on its base, same as that by 76 cm of mercury column ? (density of mercury 13.6 g cm-3)
Answer» What height of water column will exert the pressure on its base, same as that by 76 cm of mercury column ? (density of mercury 13.6 g cm^-3)

Discussion

3278.	A ball is thrown upward with speed 10 m/s from the top of the tower reaches the ground with a speed 20 m/s. The height of the tower is g=10 m/s2
Answer» A ball is thrown upward with speed 10 m/s from the top of the tower reaches the ground with a speed 20 m/s. The height of the tower is g=10 m/s2

Discussion

3279.	41.What is displacement-time graph?
Answer» 41.What is displacement-time graph?

Discussion

3280.	Is the acceleration under gravity constant in every case. Even when the velocity equal to zero because there velocity after some seconds even the velocity doesn't increase much.
Answer» Is the acceleration under gravity constant in every case. Even when the velocity equal to zero because there velocity after some seconds even the velocity doesn't increase much.

Discussion

3281.	A charged particle enters a magnetic field at right angle to the magnetic field the field exist for a length equal to 1.5times the radius of circular path of the particle the particle will be deviated from its path by
Answer» A charged particle enters a magnetic field at right angle to the magnetic field the field exist for a length equal to 1.5times the radius of circular path of the particle the particle will be deviated from its path by

Discussion

3282.	A uniform square plate has a mass of 2 kg. Two masses of 1 kg are placed at the corners B and C as shown in the figure. The centre of mass of the system gets shifted.
Answer» A uniform square plate has a mass of 2 kg. Two masses of 1 kg are placed at the corners B and C as shown in the figure. The centre of mass of the system gets shifted.

Discussion

3283.	In the far field diffraction pattern of a single slit under polychromatic illumination, the first minimum with the wavelength λ1 is found to be coincident with the third maximum at λ2. Then, which of the following equality is true?
Answer» In the far field diffraction pattern of a single slit under polychromatic illumination, the first minimum with the wavelength $λ_{1}$ is found to be coincident with the third maximum at $λ_{2}$ . Then, which of the following equality is true?

Discussion

3284.	47.The no. If impaired electron in 1s2 2s2 2p3 are
Answer» 47.The no. If impaired electron in 1s2 2s2 2p3 are

Discussion

3285.	26. A ball is thrown from the top of a tower in vertically upward direction. Velocity at a point h meter below the point of projection is twice of the velocity at a point h meter above the point of projection. Find the maximum height reached by the ball above the top of tower.
Answer» 26. A ball is thrown from the top of a tower in vertically upward direction. Velocity at a point h meter below the point of projection is twice of the velocity at a point h meter above the point of projection. Find the maximum height reached by the ball above the top of tower.

Discussion

3286.	23.A football bladder contains equimolar proportions of H2 and O2 . The composition by mass of the mixture effusing out of punctured football is in the ratio ( H2:O2) of _________.
Answer» 23.A football bladder contains equimolar proportions of $H_{2}$ and $O_{2}$ . The composition by mass of the mixture effusing out of punctured football is in the ratio ( $H_{2} : O_{2}$ ) of _________.

Discussion

3287.	Why silver coating of mirror is coated with a layer of red paint only and not any other colour?
Answer» Why silver coating of mirror is coated with a layer of red paint only and not any other colour?

Discussion

3288.	Which of the following graph correctly represent the uniform motion of this ant towards the tip of a leaf?
Answer» Which of the following graph correctly represent the uniform motion of this ant towards the tip of a leaf?

Discussion

3289.	An object is placed in front of a convex mirror at 60 m from the mirror. Its radius of curvature is 40 m. The object starts moving towards the mirror at 20 m s−1. Find the average speed of the image after a time interval of 2 seconds?
Answer» An object is placed in front of a convex mirror at $60 m$ from the mirror. Its radius of curvature is $40 m$ . The object starts moving towards the mirror at $20 m s^{- 1}$ . Find the average speed of the image after a time interval of 2 seconds?

Discussion

3290.	Can sound travel through (a) iron, and (b) water ?
Answer» Can sound travel through (a) iron, and (b) water ?

Discussion

3291.	A rotating body with moment of inertia 6x10^-4 Kg n2 has a kinetic energy 12J . The angular momentum if the body is0.61kgm2/s12x10^7kgm2/s61kgm2/s0.12kgm2/s
Answer» A rotating body with moment of inertia 6x10^-4 Kg n2 has a kinetic energy 12J . The angular momentum if the body is 0.61kgm2/s 12x10^7kgm2/s 61kgm2/s 0.12kgm2/s

Discussion

3292.	For no position of a real object ,its image is formed between the pole and the focus of concave mirrorHow?
Answer» For no position of a real object ,its image is formed between the pole and the focus of concave mirror How?

Discussion

3293.	An object just floats in water. What happens if common salt is added into the water?
Answer» An object just floats in water. What happens if common salt is added into the water?

Discussion

3294.	Which star is the nearest to Earth after Sun?
Answer» Which star is the nearest to Earth after Sun?

Discussion

3295.	With a concave mirror, an object is placed at a distance Y1 from the principal focus, on the principal axis. The image is formed at a distance Y2 from the principal focus. The focal length of the mirror is
Answer» With a concave mirror, an object is placed at a distance Y1 from the principal focus, on the principal axis. The image is formed at a distance Y2 from the principal focus. The focal length of the mirror is

Discussion

3296.	The three stage Johnson counter as shown in figure below is clocked at a constant frequency of 15MHz from the starting state of Q2Q1Q0=101. The frequency of output Q2Q1Q0 will be _____MHz.7.5
Answer» The three stage Johnson counter as shown in figure below is clocked at a constant frequency of $15 M H z$ from the starting state of $Q_{2} Q_{1} Q_{0} = 101$ . The frequency of output $Q_{2} Q_{1} Q_{0}$ will be _____ $M H z .$ 7.5

Discussion

3297.	Starting from rest, a car acquires a speed of 90 km/h in 10 s. Calculate the acceleration of the car.
Answer» Starting from rest, a car acquires a speed of 90 km/h in 10 s. Calculate the acceleration of the car.

Discussion

3298.	An Atwood machine is set up like the figure below. If m1=5.0kg and m2=15kg. What is the tension in the rope? Take the value of g=10ms−2
Answer» An Atwood machine is set up like the figure below. If $m_{1} = 5.0 k g$ and $m_{2} = 15 k g$ . What is the tension in the rope? Take the value of $g = 10 m s^{- 2}$

Discussion

3299.	A boat is travelling in a river with a speed of 10 m/s along the stream flowing with a speed of 2 m/s. From this boat, a sound transmitter is lowered into the river through a rigid support. The wavelength of the sound emitted from the transmitter inside the water is 14.45 mm. Assume that attenuation of sound in water and air is negligible. What will be the frequency detected by a receiver kept underwater downstream? [Given: Bulk modulus of water =2.088×109 Pa]
Answer» A boat is travelling in a river with a speed of $10 m/s$ along the stream flowing with a speed of $2 m/s$ . From this boat, a sound transmitter is lowered into the river through a rigid support. The wavelength of the sound emitted from the transmitter inside the water is $14.45 mm$ . Assume that attenuation of sound in water and air is negligible. What will be the frequency detected by a receiver kept underwater downstream? [Given: Bulk modulus of water $= 2.088 \times 10^{9} Pa$ ]

Discussion

3300.	Let say a thief is moving on train with 12km/h.the police car is moving with 80km/h. If the speed of train is 60km/h. What is the speed of thief w.r.t police car?
Answer» Let say a thief is moving on train with 12km/h.the police car is moving with 80km/h. If the speed of train is 60km/h. What is the speed of thief w.r.t police car?

Discussion

Explore topic-wise InterviewSolutions in .

Total internal reflection of light can occur when light travels from __________.

A man firs a gun and hears its echo after 5 s. The man then moves 310 m towards the hill and fires his gun again. This time if he hears the echo after 3s. Calculate the speed of sound.

Among which of the following situations the object(s) is/are in free fall?1. An object dropped from a certain height.2. An object is thrown upward or a person jumping off the ground.3. Flying in a aircraft.4. A car accelerating at 9.8 ms−2in the road.

A potential divider is used to give outputs of 2 V and 3 V from a 5 V source as shown in figure. Which combination of resistances, R1, R2 and R3 will give the correct voltage as mentioned in the figure?

An aircraft with a wingspan of 40 m flies with a speed of 1080 km / hr in the eastward direction at a constant altitude in the northern hemisphere, where the vertical component of the earth’s magnetic field 1.75×10−5T. Then the emf developed between the tips of the wings is

in a rocket , fuel burns at the rate of 2kg/s. this fuel gets ejected from the rocket with a velocity of 80km/s . force exerted on the rocket is

Ifλ=A + Bx, determine the position of its centre of mass.If the linear density of a rod of length L varies as λ(where x is the distance from one of its ends)

A U - tube is partially filled with water. Oil which does not mix with water is next poured into one side until water rises by 25 cm on the other side. If the density of oil is 0.8, the oil level will stand higher than the water level by

Draw a neat and labelled diagram of a screw gauge. Name its main parts and state their functions.

Two mirrors are inclined at an angle θ. For an object placed along the angular bisector of the two mirrors, 11 images are noticed. Find the angle between the mirrors :

The acceleration of a particle moving in a straight line varies with time as a = 3 t square, where a and t are in SI units. The position of the particle at t=0 s is 2 m and initial velocity is 2 m/s. The displacement of the particle at t= 2 s is

Is the horizontal intensity of earths magnetic field a constant?

Which of the following factors does not influence the amount of work done?

A spring of force cons†an t 600 Nm 1 is mounted on a horizontal table. A mass of 1.5 kg is attached to the free end of the spring, pulled sideways to a dis†an ce of 2 cm and released. The speed of the mass when the spring is compressed by 1 cm is

The relation between current in a conductor and time is shown in the figure.(i) The total charge flowing through the conductor is​​​​​​​[1 Mark]

If for the given circuit capacitive reactance is two times of inductive reactance, and resistance R is equal to inductive reactance then, the power factor of the circuit is,

What is the difference between kw (kilo watt) and kwh (kilo watt hour).

A ball is dropped from rest from a height of 15 m. What is the time taken for it to reach the ground? Take g=10 m s−2.

Till what maximum distance. We can place the image which can be seen in the concave mirror

A cubical of wood of side 30cm weighting 21.6kg floats on water with two faces horizontal .Calculate the depth of immersion of wood

A body weighs 250 N on the surface of the earth. How much it weighs half way down to the centre of the earth ?

11C undergoes β+ decay to 11B. What is the maximum energy a positron emitted in the process can possess?Atomic masses: 11C:11.0114 u; 11B:11.0093 u; e−: 0.005486. c2=931MeVu.

Find the equivalent resistance between A and B.

a capillary tube is dipped in water and it is 20 cm outside water. the water rises upto 8 cm . if the entire arrangement is put in freely falling elevator the length of water column in the capillary tube will be ??

What height of water column will exert the pressure on its base, same as that by 76 cm of mercury column ? (density of mercury 13.6 g cm-3)

A ball is thrown upward with speed 10 m/s from the top of the tower reaches the ground with a speed 20 m/s. The height of the tower is g=10 m/s2

41.What is displacement-time graph?

Is the acceleration under gravity constant in every case. Even when the velocity equal to zero because there velocity after some seconds even the velocity doesn't increase much.

A charged particle enters a magnetic field at right angle to the magnetic field the field exist for a length equal to 1.5times the radius of circular path of the particle the particle will be deviated from its path by

A uniform square plate has a mass of 2 kg. Two masses of 1 kg are placed at the corners B and C as shown in the figure. The centre of mass of the system gets shifted.

In the far field diffraction pattern of a single slit under polychromatic illumination, the first minimum with the wavelength λ1 is found to be coincident with the third maximum at λ2. Then, which of the following equality is true?

47.The no. If impaired electron in 1s2 2s2 2p3 are

26. A ball is thrown from the top of a tower in vertically upward direction. Velocity at a point h meter below the point of projection is twice of the velocity at a point h meter above the point of projection. Find the maximum height reached by the ball above the top of tower.

23.A football bladder contains equimolar proportions of H2 and O2 . The composition by mass of the mixture effusing out of punctured football is in the ratio ( H2:O2) of _________.

Why silver coating of mirror is coated with a layer of red paint only and not any other colour?

Which of the following graph correctly represent the uniform motion of this ant towards the tip of a leaf?

An object is placed in front of a convex mirror at 60 m from the mirror. Its radius of curvature is 40 m. The object starts moving towards the mirror at 20 m s−1. Find the average speed of the image after a time interval of 2 seconds?

Can sound travel through (a) iron, and (b) water ?

A rotating body with moment of inertia 6x10^-4 Kg n2 has a kinetic energy 12J . The angular momentum if the body is0.61kgm2/s12x10^7kgm2/s61kgm2/s0.12kgm2/s

For no position of a real object ,its image is formed between the pole and the focus of concave mirrorHow?

An object just floats in water. What happens if common salt is added into the water?

Which star is the nearest to Earth after Sun?

With a concave mirror, an object is placed at a distance Y1 from the principal focus, on the principal axis. The image is formed at a distance Y2 from the principal focus. The focal length of the mirror is

The three stage Johnson counter as shown in figure below is clocked at a constant frequency of 15MHz from the starting state of Q2Q1Q0=101. The frequency of output Q2Q1Q0 will be _____MHz.7.5

Starting from rest, a car acquires a speed of 90 km/h in 10 s. Calculate the acceleration of the car.

An Atwood machine is set up like the figure below. If m1=5.0kg and m2=15kg. What is the tension in the rope? Take the value of g=10ms−2

Let say a thief is moving on train with 12km/h.the police car is moving with 80km/h. If the speed of train is 60km/h. What is the speed of thief w.r.t police car?

The relation between current in a conductor and time is shown in the figure.(i) The total charge flowing through the conductor is[1 Mark]