13232 + Interview Questions in Physics Page 103 InterviewSolution

5101.	Which of the following is true about the Pole star?
Answer» Which of the following is true about the Pole star?

Discussion

5102.	55. A ball is thrown vertical upward from the ground. It crosses a point at the height of 25m,twice at an interval of 4 seconds. The ball was thrown with what velocity?
Answer» 55. A ball is thrown vertical upward from the ground. It crosses a point at the height of 25m,twice at an interval of 4 seconds. The ball was thrown with what velocity?

Discussion

5103.	A stone is projected with speed of 20 ms- at angle of 60° to vertical from a bridge. It took 4 second to touch water below bridge The maximum height reached by stone above water level is(1) 35 m(3) 55 m(2) 45 m(4) 75 m
Answer» A stone is projected with speed of 20 ms- at angle of 60° to vertical from a bridge. It took 4 second to touch water below bridge The maximum height reached by stone above water level is (1) 35 m (3) 55 m (2) 45 m (4) 75 m

Discussion

5104.	The speed of the photon in vacuum is -
Answer» The speed of the photon in vacuum is -

Discussion

5105.	A ball is projected from a certain point, on the surface of a planet and at a certain angle with the horizontal surface. The horizontal and vertical displacements x and y varies with time t in second as,x=10√3 t and y=10t−t2The maximum height attained by the ball is,
Answer» A ball is projected from a certain point, on the surface of a planet and at a certain angle with the horizontal surface. The horizontal and vertical displacements $x$ and $y$ varies with time $t$ in second as, $x = 10 \sqrt{3} t$ and $y = 10 t - t^{2}$ The maximum height attained by the ball is,

Discussion

5106.	1.What are electromagnetic waves?2. What does the separation of media mean in the definition of reflection?
Answer» 1.What are electromagnetic waves? 2. What does the separation of media mean in the definition of reflection?

Discussion

5107.	Moment of inertia of a thin uniform rod rotating about the perpendicular axis passing through its centre is I . If the same rod is bent into a ring and its moment of inertia about its diameter is I ; then the ratio I/l is
Answer» Moment of inertia of a thin uniform rod rotating about the perpendicular axis passing through its centre is I . If the same rod is bent into a ring and its moment of inertia about its diameter is I ; then the ratio I/l is

Discussion

5108.	If a hammer and a one rupee coin are dropped simultaneously from the top of a tower. Which would reach the ground first? (Neglect air/atmosphere)
Answer» If a hammer and a one rupee coin are dropped simultaneously from the top of a tower. Which would reach the ground first? (Neglect air/atmosphere)

Discussion

5109.	if someone living at Antarctica buys gold from the countries near equator and then. sells at Antarctica .By this way he would become rich . But is this possible ?
Answer» if someone living at Antarctica buys gold from the countries near equator and then. sells at Antarctica .By this way he would become rich . But is this possible ?

Discussion

5110.	Select the correct statement(s) regarding a wave.
Answer» Select the correct statement(s) regarding a wave.

Discussion

5111.	A train accelerates from zero to 20 ms−1 in 15 s. Calculate the distance covered by the train in same time.
Answer» A train accelerates from zero to $20 m s^{- 1}$ in $15 s$ . Calculate the distance covered by the train in same time.

Discussion

5112.	The displacement of a body is given by s=1/2g(t)(t), where g is acceleration due to gravity.The velocity of the body at any time t is
Answer» The displacement of a body is given by s=1/2g(t)(t), where g is acceleration due to gravity.The velocity of the body at any time t is

Discussion

5113.	Dipole in an external electric field derivation
Answer» Dipole in an external electric field derivation

Discussion

5114.	Question 8What are the qualities of an ideal source of energy?
Answer» Question 8 What are the qualities of an ideal source of energy?

Discussion

5115.	17. While we hit a wall slightly it too produces sound .Does our hands or wall is vibrating
Answer» 17. While we hit a wall slightly it too produces sound .Does our hands or wall is vibrating

Discussion

5116.	an object thrown vertically up passes height 5m twice in 5sec find time of flight?
Answer» an object thrown vertically up passes height 5m twice in 5sec find time of flight?

Discussion

5117.	Calculate the force between two point masses of 50 kg and 100 kg separated by a distance of 10 m.
Answer» Calculate the force between two point masses of $50 k g$ and $100 k g$ separated by a distance of $10 m$ .

Discussion

5118.	Select insulator of heat from the following :
Answer» Select insulator of heat from the following :

Discussion

5119.	A fish with weight 35 kg dives and hits the ground (zero height) with kinetic energy equal to 3500J. Find the height through which fish dived. Take g = 10 m/s2
Answer» A fish with weight 35 kg dives and hits the ground (zero height) with kinetic energy equal to 3500J. Find the height through which fish dived. Take g = 10 m/s²

Discussion

5120.	36.Why energy of ABMO is higher than BMO??
Answer» 36.Why energy of ABMO is higher than BMO??

Discussion

5121.	It is proposed to use the nuclear fusion reaction 1H2+ 1H2→ 2He4 in a nuclear reactor of 200 MW rating. If 25% of energy from the above reaction is used in the reactor. It is found that nearly 12x grams of deuterium will be needed per day. The value of x is (integer only)[Take, mass of 1H2=2.0141 amu,mass of 2He4=4.0026 amu,1amu c2=931.5 MeV]
Answer» It is proposed to use the nuclear fusion reaction $_{1} H^{2} +_{1} H^{2} \to_{2} {He}^{4}$ in a nuclear reactor of $200 MW$ rating. If $25 %$ of energy from the above reaction is used in the reactor. It is found that nearly $12 x$ grams of deuterium will be needed per day. The value of $x$ is (integer only) $[Take, mass of_{1} H^{2} = 2.0141 amu, mass of_{2} {He}^{4} = 4.0026 amu, 1 amu c^{2} = 931.5 MeV]$

Discussion

5122.	if 1/nth part of the chain is hanging at the edge of a table then work done against gravity to pull the hanging part oo the table is
Answer» if 1/nth part of the chain is hanging at the edge of a table then work done against gravity to pull the hanging part oo the table is

Discussion

5123.	how centre of mass doesn't alter in case of ,when boy moves on a boat from one end to another
Answer» how centre of mass doesn't alter in case of ,when boy moves on a boat from one end to another

Discussion

5124.	A resistor of resistance 20 Ω is connected to a source of alternating current rated 110 V,50 Hz. Find the maximum instantaneous current in the resistor.
Answer» A resistor of resistance $20 Ω$ is connected to a source of alternating current rated $110 V, 50 Hz$ . Find the maximum instantaneous current in the resistor.

Discussion

5125.	Name the tube which connects the middle ear to throat.
Answer» Name the tube which connects the middle ear to throat.

Discussion

5126.	Sir I am Shaun job of class 9. I haven't a doubt regarding physics on the topic sound.This is the question Is an echo "the repetition of sound by the reflection of sound" or is reverberation " the repetition of sound by the reflection of sound" Thank you for your time Sir Yours sincerely Shaun
Answer» Sir I am Shaun job of class 9. I haven't a doubt regarding physics on the topic sound.This is the question Is an echo "the repetition of sound by the reflection of sound" or is reverberation " the repetition of sound by the reflection of sound" Thank you for your time Sir Yours sincerely Shaun

Discussion

5127.	A taxi was hired for a round trip from city A to B . It covered a distance of 500 km in hours and returned in 6 hours covering 500 km . Find the average speed of the taxi for the whole journey. Is it same as average velocity
Answer» A taxi was hired for a round trip from city A to B . It covered a distance of 500 km in hours and returned in 6 hours covering 500 km . Find the average speed of the taxi for the whole journey. Is it same as average velocity

Discussion

5128.	Write three equations of uniformly accelerated motion relating the initial velocity (u),final velocity (v), time(t), acceleration (a) and displacement (S).
Answer» Write three equations of uniformly accelerated motion relating the initial velocity (u),final velocity (v), time(t), acceleration (a) and displacement (S).

Discussion

5129.	A huge elevator platform is going up at a speed of 20 m/sec and during its upward motion a small ball of mass 50 gm falling in downward direction strikes the platform elastically at a speed 5 m/sec. Find the speed in m/sec with which the ball rebounds.
Answer» A huge elevator platform is going up at a speed of $20 m/sec$ and during its upward motion a small ball of mass $50 gm$ falling in downward direction strikes the platform elastically at a speed $5 m/sec$ . Find the speed in m/sec with which the ball rebounds.

Discussion

5130.	The mass of the moon is 7.34×1022kg and the radius is 1.74×106m. The value of gravitation force will be
Answer» The mass of the moon is $7.34 \times 10^{22} k g$ and the radius is $1.74 \times 10^{6} m$ . The value of gravitation force will be

Discussion

5131.	How Mass (of a component) = molefractionmolar mass (of that component)
Answer» How Mass (of a component) = molefractionmolar mass (of that component)

Discussion

5132.	A man standing in front of a vertical cliff fires a gun and hears the echo after 4 seconds. He moves 150 m towards the cliff and again fires the gun. This time, he hears the echo after 3.6 seconds. Find the distance of the cliff from his first position. (Assume velocity of sound is not known)
Answer» A man standing in front of a vertical cliff fires a gun and hears the echo after 4 seconds. He moves 150 m towards the cliff and again fires the gun. This time, he hears the echo after 3.6 seconds. Find the distance of the cliff from his first position. (Assume velocity of sound is not known)

Discussion

5133.	a bomb of mass 16 kg at rest explode into pieces of masses 4 kg and 12 kg . the ratio of kinetic energy of heavier piece to lighter piece
Answer» a bomb of mass 16 kg at rest explode into pieces of masses 4 kg and 12 kg . the ratio of kinetic energy of heavier piece to lighter piece

Discussion

5134.	19. If kinetic energy of a body increased by 0.1%, the percentage increase in its Momentum will be
Answer» 19. If kinetic energy of a body increased by 0.1%, the percentage increase in its Momentum will be

Discussion

5135.	20.A normal human eye can see an object making an angle of 1.8degree at the eye. What is the approximate height of object which can be seen by an eye placed at a distance of 1meter from the object?
Answer» 20.A normal human eye can see an object making an angle of 1.8degree at the eye. What is the approximate height of object which can be seen by an eye placed at a distance of 1meter from the object?

Discussion

5136.	Action-reaction forces act:
Answer» Action-reaction forces act:

Discussion

5137.	5. A particle moving in xy plane is projected from origin with velocity u=(4i+3j) m/s , under the gravity (g=10 m/s2) . Then y coordinate of highest position is (1) 1/20 m   (2) 3/20 m   (3) 6/25 m    (4) 9/20 m  
Answer» 5. A particle moving in xy plane is projected from origin with velocity u=(4i+3j) m/s , under the gravity (g=10 m/s2) . Then y coordinate of highest position is (1) 1/20 m   (2) 3/20 m   (3) 6/25 m    (4) 9/20 m  

Discussion

5138.	The positions of neutral points when a magnet is placed with its axis in the magnetic meridian and with its north pole pointing towards geographic north is:
Answer» The positions of neutral points when a magnet is placed with its axis in the magnetic meridian and with its north pole pointing towards geographic north is:

Discussion

5139.	A glass slab of thickness 3 cm and refractive index (μg)=32 is placed in front of a concave mirror as shown in figure.At what distance the final image will be formed from the mirror?
Answer» A glass slab of thickness $3 cm$ and refractive index $(μ_{g}) = \frac{3}{2}$ is placed in front of a concave mirror as shown in figure. At what distance the final image will be formed from the mirror?

Discussion

5140.	Question 4The inertia of an object tends to cause the object(a) to increase its speed(b) to decrease its speed(c) to resist any change in its state of motion(d) to decelerate due to friction
Answer» Question 4 The inertia of an object tends to cause the object (a) to increase its speed (b) to decrease its speed (c) to resist any change in its state of motion (d) to decelerate due to friction

Discussion

5141.	Which of the following symptoms is likely to afflict an astronaut in space (a) swollen feet, (b) swollen face, (c) headache, (d) orientational problem
Answer» Which of the following symptoms is likely to afflict an astronaut in space (a) swollen feet, (b) swollen face, (c) headache, (d) orientational problem

Discussion

5142.	The respective densities of copper and water are 89200 kg m−3 and 1000 kg m−3.What is the relative density of copper?
Answer» The respective densities of copper and water are 89200 kg m⁻³ and 1000 kg m⁻³.What is the relative density of copper?

Discussion

5143.	A compass has a small balanced pointer that always points North-South when suspended freely. This is because :
Answer» A compass has a small balanced pointer that always points North-South when suspended freely. This is because :

Discussion

5144.	Statement 1 : Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap. Statement 2 : Velocity of sound in air is 330 m/s and time of persistence for hearing is 1/10 of a second.
Answer» Statement 1 : Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap. Statement 2 : Velocity of sound in air is 330 m/s and time of persistence for hearing is 1/10 of a second.

5144.

Statement 1 : Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap. Statement 2 : Velocity of sound in air is 330 m/s and time of persistence for hearing is 1/10 of a second.

Answer»

Statement 1 : Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap.

Statement 2 : Velocity of sound in air is 330 m/s and time of persistence for hearing is 1/10 of a second.

Discussion

5145.	How is f is directly proportional to 1\r^2 derived
Answer» How is f is directly proportional to 1\r^2 derived

Discussion

5146.	An object is projected from building of height 90 m. The body took 6 s to reach level of projection. If the body was projected at angle 37° to horizontal, calculate maximum height achieved by projectile (object) above the ground.(g = 10 ms–2)(1) 135 m(2) 104.25 m(3) 112.5 m(4) 125.5 m
Answer» An object is projected from building of height 90 m. The body took 6 s to reach level of projection. If the body was projected at angle 37° to horizontal, calculate maximum height achieved by projectile (object) above the ground.(g = 10 ms–2) (1) 135 m (2) 104.25 m (3) 112.5 m (4) 125.5 m

Discussion

5147.	The velocity-time graph for a uniform retardation is:
Answer» The velocity-time graph for a uniform retardation is:

5147.

The velocity-time graph for a uniform retardation is:

Answer»

The velocity-time graph for a uniform retardation is:

Discussion

5148.	There are two bodies A and B. 'A' has a negative charge whereas 'B' has no charge. When A and B are connected by a metallic wire, in what direction will the electrons flow?
Answer» There are two bodies A and B. 'A' has a negative charge whereas 'B' has no charge. When A and B are connected by a metallic wire, in what direction will the electrons flow?

Discussion

5149.	Two cars, LaFerrari and Hyundai are having a competition for highest speed. La Ferrari can accelerate with 20 m per second square till 5 seconds and Hyundai with 17 m per second square upto 6 seconds. Who wins?
Answer» Two cars, LaFerrari and Hyundai are having a competition for highest speed. La Ferrari can accelerate with 20 m per second square till 5 seconds and Hyundai with 17 m per second square upto 6 seconds. Who wins?

Discussion

5150.	The unit of relative density is : (a) g cm−3 (b) kg m−3 (c) m3 kg−1 (d) no unit.
Answer» The unit of relative density is : (a) g $c m^{- 3}$ (b) kg $m^{- 3}$ (c) $m^{3} k g^{- 1}$ (d) no unit.

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following is true about the Pole star?

55. A ball is thrown vertical upward from the ground. It crosses a point at the height of 25m,twice at an interval of 4 seconds. The ball was thrown with what velocity?

A stone is projected with speed of 20 ms- at angle of 60° to vertical from a bridge. It took 4 second to touch water below bridge The maximum height reached by stone above water level is(1) 35 m(3) 55 m(2) 45 m(4) 75 m

The speed of the photon in vacuum is -

A ball is projected from a certain point, on the surface of a planet and at a certain angle with the horizontal surface. The horizontal and vertical displacements x and y varies with time t in second as,x=10√3 t and y=10t−t2The maximum height attained by the ball is,

1.What are electromagnetic waves?2. What does the separation of media mean in the definition of reflection?

Moment of inertia of a thin uniform rod rotating about the perpendicular axis passing through its centre is I . If the same rod is bent into a ring and its moment of inertia about its diameter is I ; then the ratio I/l is

If a hammer and a one rupee coin are dropped simultaneously from the top of a tower. Which would reach the ground first? (Neglect air/atmosphere)

if someone living at Antarctica buys gold from the countries near equator and then. sells at Antarctica .By this way he would become rich . But is this possible ?

Select the correct statement(s) regarding a wave.

A train accelerates from zero to 20 ms−1 in 15 s. Calculate the distance covered by the train in same time.

The displacement of a body is given by s=1/2g(t)(t), where g is acceleration due to gravity.The velocity of the body at any time t is

Dipole in an external electric field derivation

Question 8What are the qualities of an ideal source of energy?

17. While we hit a wall slightly it too produces sound .Does our hands or wall is vibrating

an object thrown vertically up passes height 5m twice in 5sec find time of flight?

Calculate the force between two point masses of 50 kg and 100 kg separated by a distance of 10 m.

Select insulator of heat from the following :

A fish with weight 35 kg dives and hits the ground (zero height) with kinetic energy equal to 3500J. Find the height through which fish dived. Take g = 10 m/s2

36.Why energy of ABMO is higher than BMO??

if 1/nth part of the chain is hanging at the edge of a table then work done against gravity to pull the hanging part oo the table is

how centre of mass doesn't alter in case of ,when boy moves on a boat from one end to another

A resistor of resistance 20 Ω is connected to a source of alternating current rated 110 V,50 Hz. Find the maximum instantaneous current in the resistor.

Name the tube which connects the middle ear to throat.

Sir I am Shaun job of class 9. I haven't a doubt regarding physics on the topic sound.This is the question Is an echo "the repetition of sound by the reflection of sound" or is reverberation " the repetition of sound by the reflection of sound" Thank you for your time Sir Yours sincerely Shaun

A taxi was hired for a round trip from city A to B . It covered a distance of 500 km in hours and returned in 6 hours covering 500 km . Find the average speed of the taxi for the whole journey. Is it same as average velocity

Write three equations of uniformly accelerated motion relating the initial velocity (u),final velocity (v), time(t), acceleration (a) and displacement (S).

A huge elevator platform is going up at a speed of 20 m/sec and during its upward motion a small ball of mass 50 gm falling in downward direction strikes the platform elastically at a speed 5 m/sec. Find the speed in m/sec with which the ball rebounds.

The mass of the moon is 7.34×1022kg and the radius is 1.74×106m. The value of gravitation force will be

How Mass (of a component) = molefractionmolar mass (of that component)

A man standing in front of a vertical cliff fires a gun and hears the echo after 4 seconds. He moves 150 m towards the cliff and again fires the gun. This time, he hears the echo after 3.6 seconds. Find the distance of the cliff from his first position. (Assume velocity of sound is not known)

a bomb of mass 16 kg at rest explode into pieces of masses 4 kg and 12 kg . the ratio of kinetic energy of heavier piece to lighter piece

19. If kinetic energy of a body increased by 0.1%, the percentage increase in its Momentum will be

20.A normal human eye can see an object making an angle of 1.8degree at the eye. What is the approximate height of object which can be seen by an eye placed at a distance of 1meter from the object?

Action-reaction forces act:

5. A particle moving in xy plane is projected from origin with velocity u=(4i+3j) m/s , under the gravity (g=10 m/s2) . Then y coordinate of highest position is (1) 1/20 m   (2) 3/20 m   (3) 6/25 m    (4) 9/20 m  

The positions of neutral points when a magnet is placed with its axis in the magnetic meridian and with its north pole pointing towards geographic north is:

A glass slab of thickness 3 cm and refractive index (μg)=32 is placed in front of a concave mirror as shown in figure.At what distance the final image will be formed from the mirror?

Question 4The inertia of an object tends to cause the object(a) to increase its speed(b) to decrease its speed(c) to resist any change in its state of motion(d) to decelerate due to friction

Which of the following symptoms is likely to afflict an astronaut in space (a) swollen feet, (b) swollen face, (c) headache, (d) orientational problem

The respective densities of copper and water are 89200 kg m−3 and 1000 kg m−3.What is the relative density of copper?

A compass has a small balanced pointer that always points North-South when suspended freely. This is because :

Statement 1 : Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap. Statement 2 : Velocity of sound in air is 330 m/s and time of persistence for hearing is 1/10 of a second.

How is f is directly proportional to 1\r^2 derived

An object is projected from building of height 90 m. The body took 6 s to reach level of projection. If the body was projected at angle 37° to horizontal, calculate maximum height achieved by projectile (object) above the ground.(g = 10 ms–2)(1) 135 m(2) 104.25 m(3) 112.5 m(4) 125.5 m

The velocity-time graph for a uniform retardation is:

There are two bodies A and B. 'A' has a negative charge whereas 'B' has no charge. When A and B are connected by a metallic wire, in what direction will the electrons flow?

Two cars, LaFerrari and Hyundai are having a competition for highest speed. La Ferrari can accelerate with 20 m per second square till 5 seconds and Hyundai with 17 m per second square upto 6 seconds. Who wins?

The unit of relative density is : (a) g cm−3 (b) kg m−3 (c) m3 kg−1 (d) no unit.