13232 + Interview Questions in Physics Page 263 InterviewSolution

13101.	A body of mass 500g is accelerated at 2m /sec^2 Find magnitude of accelerating force
Answer» A body of mass 500g is accelerated at 2m /sec^2 Find magnitude of accelerating force

Discussion

13102.	The top of a lake gets frozen at a place where the surrounding air is at a temperature of −20∘C. Then choose the correct statement.
Answer» The top of a lake gets frozen at a place where the surrounding air is at a temperature of $- 20^{\circ} C$ . Then choose the correct statement.

Discussion

13103.	A car of mass 1500 kg travelling at 25 m/s collides with another car B of mass 1000 kg travelling at 15 m/s in the same direction after the collision, the velocity of car B will be
Answer» A car of mass 1500 kg travelling at 25 m/s collides with another car B of mass 1000 kg travelling at 15 m/s in the same direction after the collision, the velocity of car B will be

Discussion

13104.	Car A of mass 1500 kg moving of a velocity of 25 metre per second colloid another car B of mass1000 kg moving at a speed of 15 metre per second. After collision the velocity of car A 20 metre per second car B?
Answer» Car A of mass 1500 kg moving of a velocity of 25 metre per second colloid another car B of mass1000 kg moving at a speed of 15 metre per second. After collision the velocity of car A 20 metre per second car B?

Discussion

13105.	Which of the following is not the unit of the time?
Answer» Which of the following is not the unit of the time?

Discussion

13106.	How can the velocity of a moving object be negative?
Answer» How can the velocity of a moving object be negative?

Discussion

13107.	What is electric field?
Answer» What is electric field?

Discussion

13108.	Why is it harder to push a van filled with bowling balls than it is to push a van filled with basketballs? Consider the mass of the two vans to be equal.
Answer» Why is it harder to push a van filled with bowling balls than it is to push a van filled with basketballs? Consider the mass of the two vans to be equal.

Discussion

13109.	Identify free fall situations from the following.
Answer» Identify free fall situations from the following.

Discussion

13110.	A boy starts jogging from his house and move 500 m towards west than 400 m towards south and then 600 M towards east and finally 400 m towards north calculate the distance and displacement.
Answer» A boy starts jogging from his house and move 500 m towards west than 400 m towards south and then 600 M towards east and finally 400 m towards north calculate the distance and displacement.

Discussion

13111.	A bullet of mass A and velocity B is fired into a wooden block of mass C. If the bullet gets embedded in the wooden block, then the the magnitude of velocity of the system just after collision will be (a)A+B/AC . (b)A+C/B+C . (c)AC/B+C . (d)AB/A+C
Answer» A bullet of mass A and velocity B is fired into a wooden block of mass C. If the bullet gets embedded in the wooden block, then the the magnitude of velocity of the system just after collision will be (a)A+B/AC . (b)A+C/B+C . (c)AC/B+C . (d)AB/A+C

13111.

A bullet of mass A and velocity B is fired into a wooden block of mass C. If the bullet gets embedded in the wooden block, then the the magnitude of velocity of the system just after collision will be (a)A+B/AC . (b)A+C/B+C . (c)AC/B+C . (d)AB/A+C

Answer»

A bullet of mass A and velocity B is fired into a wooden block of mass C. If the bullet gets embedded in the wooden block, then the the magnitude of velocity of the system just after collision will be

(a)A+B/AC . (b)A+C/B+C . (c)AC/B+C . (d)AB/A+C

Discussion

13112.	This was a musical intrument of the Harappan’s
Answer» This was a musical intrument of the Harappan’s

Discussion

13113.	If we release all the vacuum from the breaker and put an iron naik and feather then which of these will fall faster and why?
Answer» If we release all the vacuum from the breaker and put an iron naik and feather then which of these will fall faster and why?

Discussion

13114.	A balloon starts rising at an acceleration. After some time, a stone is dropped from it. If the stone reaches the ground in the same time in which balloon reached at this point from where stone is dropped, find the acceleration of the balloon:
Answer» A balloon starts rising at an acceleration. After some time, a stone is dropped from it. If the stone reaches the ground in the same time in which balloon reached at this point from where stone is dropped, find the acceleration of the balloon:

Discussion

13115.	What precautions would you take to set up a potometer? [4 MARKS]
Answer» What precautions would you take to set up a potometer? [4 MARKS]

Discussion

13116.	In a stack there are 10 books each of thickness 10 mm and 8 paper sheets each of thickness 0.015 mm. What is the total thickness of the stack?
Answer» In a stack there are 10 books each of thickness 10 mm and 8 paper sheets each of thickness 0.015 mm. What is the total thickness of the stack?

Discussion

13117.	For uniform circular motion:
Answer» For uniform circular motion:

Discussion

13118.	Two capillaries made of the same material with radii r1=1mm and r2=2mm. The rise of the liquid in one capillary (r1=1mm) is 30 cm, then the rise in the other will be
Answer» Two capillaries made of the same material with radii $r_{1}$ =1mm and $r_{2}$ =2mm. The rise of the liquid in one capillary ( $r_{1}$ =1mm) is 30 cm, then the rise in the other will be

13118.

Two capillaries made of the same material with radii r1=1mm and r2=2mm. The rise of the liquid in one capillary (r1=1mm) is 30 cm, then the rise in the other will be

Answer»

Two capillaries made of the same material with radii $r_{1}$ =1mm and $r_{2}$ =2mm. The rise of the liquid in one capillary ( $r_{1}$ =1mm) is 30 cm, then the rise in the other will be

Discussion

13119.	A body is thrown vertically up with an initial velocity of 60 m/s. If acceleration due to gravity g = 10 m/s2, what is the time taken to reach a height of 100 m. [3 MARKS]
Answer» A body is thrown vertically up with an initial velocity of 60 m/s. If acceleration due to gravity g = $10 m / s^{2}$ , what is the time taken to reach a height of 100 m. [3 MARKS]

Discussion

13120.	If the length of a simple pendulum at a given place is increased by 6 times, the ratio of the final to the initial time periods of the pendulum is .
Answer» If the length of a simple pendulum at a given place is increased by 6 times, the ratio of the final to the initial time periods of the pendulum is .

Discussion

13121.	A pendulum is suspended from a rigid support with the bottom end of its bob at a height of 20 cm and the point of suspension at 185 cm. If the radius of the bob is 211th of its effective length. Calculate and express the radius of the bob in metre.0.2538
Answer» A pendulum is suspended from a rigid support with the bottom end of its bob at a height of $20 c m$ and the point of suspension at $185 c m$ . If the radius of the bob is $\frac{2}{11}$ th of its effective length. Calculate and express the radius of the bob in metre. 0.2538

Discussion

13122.	The same body is immersed in two liquids A and B in succession. The extent to which the body sinks in liquid B is less then in liquid A. What are the conclusions that could be derived from such an observation
Answer» The same body is immersed in two liquids A and B in succession. The extent to which the body sinks in liquid B is less then in liquid A. What are the conclusions that could be derived from such an observation

Discussion

13123.	A motorcycle moving with a speed of 5m/s is subjected to an acceleration of 0.2 m/s2. Calculate the speed of the motorcycle after 10 seconds, and the distance travelled in this time.
Answer» A motorcycle moving with a speed of 5m/s is subjected to an acceleration of 0.2 m/s $^{2}$ . Calculate the speed of the motorcycle after 10 seconds, and the distance travelled in this time.

Discussion

13124.	An iron ball and a wooden ball of same radius are released from a height ‘h’ in vacuum. Which of the two balls would take more time to reach the ground ?
Answer» An iron ball and a wooden ball of same radius are released from a height ‘h’ in vacuum. Which of the two balls would take more time to reach the ground ?

Discussion

13125.	In simple telescope, the lens in front of the object is known as ___________.
Answer» In simple telescope, the lens in front of the object is known as ___________.

Discussion

13126.	A coil of insulated copper wire is wound around a piece of soft iron and current is passed in the coil from a battery. What name is given to the device so obtained ? Give one use of the device mentioned by you.
Answer» A coil of insulated copper wire is wound around a piece of soft iron and current is passed in the coil from a battery. What name is given to the device so obtained ? Give one use of the device mentioned by you.

Discussion

13127.	Convert a force of 5 kg-wt into SI unit of force .
Answer» Convert a force of 5 kg-wt into SI unit of force .

Discussion

13128.	Why uniform circular motion is called as an accelerated motion
Answer» Why uniform circular motion is called as an accelerated motion

Discussion

13129.	A glass flask is filled up to a mark with 50 cc of mercury at 18∘C . If the flask and contents are heated to 38∘C , how much mercury will be above the mark ? ( for glass is 9 × 10−6/∘C and coefficient of real expansion of mercury is 180 × 10−6/∘C)
Answer» A glass flask is filled up to a mark with 50 cc of mercury at $18^{\circ} C$ . If the flask and contents are heated to $38^{\circ} C$ , how much mercury will be above the mark ? ( for glass is 9 × $10^{- 6} /^{\circ} C$ and coefficient of real expansion of mercury is 180 × $10^{- 6} /^{\circ} C$ )

13129.

A glass flask is filled up to a mark with 50 cc of mercury at 18∘C . If the flask and contents are heated to 38∘C , how much mercury will be above the mark ? ( for glass is 9 × 10−6/∘C and coefficient of real expansion of mercury is 180 × 10−6/∘C)

Answer»

A glass flask is filled up to a mark with 50 cc of mercury at $18^{\circ} C$ . If the flask and contents are heated to $38^{\circ} C$ , how much mercury will be above the mark ? ( for glass is 9 × $10^{- 6} /^{\circ} C$ and coefficient of real expansion of mercury is 180 × $10^{- 6} /^{\circ} C$ )

Discussion

13130.	The velocity of a body of mass 15 kg increases from 5 m/s to 10 m/s when a force acts on it for 2 s. What is the gain in momentum per second?
Answer» The velocity of a body of mass 15 kg increases from 5 m/s to 10 m/s when a force acts on it for 2 s. What is the gain in momentum per second?

Discussion

13131.	The global warming has resulted in : (a) the increase in yield of crops (b) the decrease in sea levels (c) the decrease in human deaths (d) the increase in sea levels.
Answer» The global warming has resulted in : (a) the increase in yield of crops (b) the decrease in sea levels (c) the decrease in human deaths (d) the increase in sea levels.

13131.

The global warming has resulted in : (a) the increase in yield of crops (b) the decrease in sea levels (c) the decrease in human deaths (d) the increase in sea levels.

Answer»

The global warming has resulted in :

(a) the increase in yield of crops

(b) the decrease in sea levels

(c) the decrease in human deaths

(d) the increase in sea levels.

Discussion

13132.	For what purposes ultrasound can be used?
Answer» For what purposes ultrasound can be used?

Discussion

13133.	Use the following information to answer the next question. Shivani throws a stone upward with a velocity of 19.6 m/s. The acceleration of the stone in this case is 9.8 m/s2, acting toward earth. What is the maximum height reached by the stone?
Answer» Use the following information to answer the next question. Shivani throws a stone upward with a velocity of 19.6 m/s. The acceleration of the stone in this case is 9.8 m/s², acting toward earth. What is the maximum height reached by the stone?

13133.

Use the following information to answer the next question. Shivani throws a stone upward with a velocity of 19.6 m/s. The acceleration of the stone in this case is 9.8 m/s2, acting toward earth. What is the maximum height reached by the stone?

Answer»

Use the following information to answer the next question.

Shivani throws a stone upward with a velocity of 19.6 m/s. The acceleration of the stone in this case is 9.8 m/s², acting toward earth.

What is the maximum height reached by the stone?

Discussion

13134.	How battery creates a potential difference in a circuit?
Answer» How battery creates a potential difference in a circuit?

Discussion

13135.	A body is moving in a straight line and its displacement at various instants of time is given in the following table: Time (s)01234567Displacement (m)26121212182224 Plot displacement-time graph and calculate: (i) total distance travelled in interval 1 s to 5 s, (ii) average velocity in time interval 1 s to 5 s.
Answer» A body is moving in a straight line and its displacement at various instants of time is given in the following table: $\begin{matrix} T i m e (s) & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 D i s p l a c e m e n t (m) & 2 & 6 & 12 & 12 & 12 & 18 & 22 & 24 \end{matrix}$ Plot displacement-time graph and calculate: (i) total distance travelled in interval 1 s to 5 s, (ii) average velocity in time interval 1 s to 5 s.

13135.

A body is moving in a straight line and its displacement at various instants of time is given in the following table: Time (s)01234567Displacement (m)26121212182224 Plot displacement-time graph and calculate: (i) total distance travelled in interval 1 s to 5 s, (ii) average velocity in time interval 1 s to 5 s.

Answer»

A body is moving in a straight line and its displacement at various instants of time is given in the following table:

$\begin{matrix} T i m e (s) & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 D i s p l a c e m e n t (m) & 2 & 6 & 12 & 12 & 12 & 18 & 22 & 24 \end{matrix}$

Plot displacement-time graph and calculate:

(i) total distance travelled in interval 1 s to 5 s,

(ii) average velocity in time interval 1 s to 5 s.

Discussion

13136.	Under what conditions would the speed of a body be equal to the magnitude of velocity?
Answer» Under what conditions would the speed of a body be equal to the magnitude of velocity?

Discussion

13137.	The higher the ______ of an ecosystem, the higher its _______.
Answer» The higher the ______ of an ecosystem, the higher its _______.

Discussion

13138.	In a Streamline flow
Answer» In a Streamline flow

Discussion

13139.	According to the convention, the direction of flow of electric current is taken from positive terminal to the negative terminal of the battery, which is opposite to the flow of ___.
Answer» According to the convention, the direction of flow of electric current is taken from positive terminal to the negative terminal of the battery, which is opposite to the flow of ___.

Discussion

13140.	Why when we go inside Earth to its core its gravitional pull of earth decreases ? Plz show with derivation.
Answer» Why when we go inside Earth to its core its gravitional pull of earth decreases ? Plz show with derivation.

Discussion

13141.	In a circular loop, we can find the polarity of the faces by using
Answer» In a circular loop, we can find the polarity of the faces by using

Discussion

13142.	A bullet of 5 g is fired from a pistol of 1.5 kg. If the recoil velocity of pistol is 1.5 m/s, what is final momentum of pistol?
Answer» A bullet of 5 $g$ is fired from a pistol of 1.5 kg. If the recoil velocity of pistol is 1.5 $\frac{m}{s}$ , what is final momentum of pistol?

Discussion

13143.	What is meant by the term 'buoyancy' ?
Answer» What is meant by the term 'buoyancy' ?

Discussion

13144.	what is meant by constant independent of initial velocity?
Answer» what is meant by constant independent of initial velocity?

Discussion

13145.	Which is denser gold and mercury
Answer» Which is denser gold and mercury

Discussion

13146.	In equation f=ma, we take net force acting on an object or force exerted by an object?
Answer» In equation f=ma, we take net force acting on an object or force exerted by an object?

Discussion

13147.	A body of density ρ is immersed in a liquid of density ρL. State condition when the body will (i) float, (ii) sink, in liquid.
Answer» A body of density $ρ$ is immersed in a liquid of density $ρ_{L}$ . State condition when the body will (i) float, (ii) sink, in liquid.

Discussion

13148.	A 1000w oven is used 60 minutes everyday. Calculate the mumber of units of electrical energy oven consumes in 30 days.
Answer» A 1000w oven is used 60 minutes everyday. Calculate the mumber of units of electrical energy oven consumes in 30 days.

Discussion

13149.	The energy required to be spent by a satellite of mass m and speed v and orbital radius r in completing a circular orbit once round the earth of mass M is
Answer» The energy required to be spent by a satellite of mass m and speed v and orbital radius r in completing a circular orbit once round the earth of mass M is

Discussion

13150.	A whistle producing sound waves of frequencies 9500 Hz and above is approaching a stationary person with speed v ms-1. The velocity of sound in air is 300 ms-1. If the person can hear frequencies up to 10000 Hz, the maximum value of v upto which he can the whistle is
Answer» A whistle producing sound waves of frequencies 9500 Hz and above is approaching a stationary person with speed v ms^-1. The velocity of sound in air is 300 ms^-1. If the person can hear frequencies up to 10000 Hz, the maximum value of v upto which he can the whistle is

Discussion

Explore topic-wise InterviewSolutions in .

A body of mass 500g is accelerated at 2m /sec^2 Find magnitude of accelerating force

The top of a lake gets frozen at a place where the surrounding air is at a temperature of −20∘C. Then choose the correct statement.

A car of mass 1500 kg travelling at 25 m/s collides with another car B of mass 1000 kg travelling at 15 m/s in the same direction after the collision, the velocity of car B will be

Car A of mass 1500 kg moving of a velocity of 25 metre per second colloid another car B of mass1000 kg moving at a speed of 15 metre per second. After collision the velocity of car A 20 metre per second car B?

Which of the following is not the unit of the time?

How can the velocity of a moving object be negative?

What is electric field?

Why is it harder to push a van filled with bowling balls than it is to push a van filled with basketballs? Consider the mass of the two vans to be equal.

Identify free fall situations from the following.

A boy starts jogging from his house and move 500 m towards west than 400 m towards south and then 600 M towards east and finally 400 m towards north calculate the distance and displacement.

A bullet of mass A and velocity B is fired into a wooden block of mass C. If the bullet gets embedded in the wooden block, then the the magnitude of velocity of the system just after collision will be (a)A+B/AC . (b)A+C/B+C . (c)AC/B+C . (d)AB/A+C

This was a musical intrument of the Harappan’s

If we release all the vacuum from the breaker and put an iron naik and feather then which of these will fall faster and why?

A balloon starts rising at an acceleration. After some time, a stone is dropped from it. If the stone reaches the ground in the same time in which balloon reached at this point from where stone is dropped, find the acceleration of the balloon:

What precautions would you take to set up a potometer? [4 MARKS]

In a stack there are 10 books each of thickness 10 mm and 8 paper sheets each of thickness 0.015 mm. What is the total thickness of the stack?

For uniform circular motion:

Two capillaries made of the same material with radii r1=1mm and r2=2mm. The rise of the liquid in one capillary (r1=1mm) is 30 cm, then the rise in the other will be

A body is thrown vertically up with an initial velocity of 60 m/s. If acceleration due to gravity g = 10 m/s2, what is the time taken to reach a height of 100 m. [3 MARKS]

If the length of a simple pendulum at a given place is increased by 6 times, the ratio of the final to the initial time periods of the pendulum is .

A pendulum is suspended from a rigid support with the bottom end of its bob at a height of 20 cm and the point of suspension at 185 cm. If the radius of the bob is 211th of its effective length. Calculate and express the radius of the bob in metre.0.2538

The same body is immersed in two liquids A and B in succession. The extent to which the body sinks in liquid B is less then in liquid A. What are the conclusions that could be derived from such an observation

A motorcycle moving with a speed of 5m/s is subjected to an acceleration of 0.2 m/s2. Calculate the speed of the motorcycle after 10 seconds, and the distance travelled in this time.

An iron ball and a wooden ball of same radius are released from a height ‘h’ in vacuum. Which of the two balls would take more time to reach the ground ?

In simple telescope, the lens in front of the object is known as ___________.

A coil of insulated copper wire is wound around a piece of soft iron and current is passed in the coil from a battery. What name is given to the device so obtained ? Give one use of the device mentioned by you.

Convert a force of 5 kg-wt into SI unit of force .

Why uniform circular motion is called as an accelerated motion

A glass flask is filled up to a mark with 50 cc of mercury at 18∘C . If the flask and contents are heated to 38∘C , how much mercury will be above the mark ? ( for glass is 9 × 10−6/∘C and coefficient of real expansion of mercury is 180 × 10−6/∘C)

The velocity of a body of mass 15 kg increases from 5 m/s to 10 m/s when a force acts on it for 2 s. What is the gain in momentum per second?

The global warming has resulted in : (a) the increase in yield of crops (b) the decrease in sea levels (c) the decrease in human deaths (d) the increase in sea levels.

For what purposes ultrasound can be used?

Use the following information to answer the next question. Shivani throws a stone upward with a velocity of 19.6 m/s. The acceleration of the stone in this case is 9.8 m/s2, acting toward earth. What is the maximum height reached by the stone?

How battery creates a potential difference in a circuit?

Under what conditions would the speed of a body be equal to the magnitude of velocity?

The higher the ______ of an ecosystem, the higher its _______.

In a Streamline flow

According to the convention, the direction of flow of electric current is taken from positive terminal to the negative terminal of the battery, which is opposite to the flow of ___.

Why when we go inside Earth to its core its gravitional pull of earth decreases ? Plz show with derivation.

In a circular loop, we can find the polarity of the faces by using

A bullet of 5 g is fired from a pistol of 1.5 kg. If the recoil velocity of pistol is 1.5 m/s, what is final momentum of pistol?

What is meant by the term 'buoyancy' ?

what is meant by constant independent of initial velocity?

Which is denser gold and mercury

In equation f=ma, we take net force acting on an object or force exerted by an object?

A body of density ρ is immersed in a liquid of density ρL. State condition when the body will (i) float, (ii) sink, in liquid.

A 1000w oven is used 60 minutes everyday. Calculate the mumber of units of electrical energy oven consumes in 30 days.

The energy required to be spent by a satellite of mass m and speed v and orbital radius r in completing a circular orbit once round the earth of mass M is

A whistle producing sound waves of frequencies 9500 Hz and above is approaching a stationary person with speed v ms-1. The velocity of sound in air is 300 ms-1. If the person can hear frequencies up to 10000 Hz, the maximum value of v upto which he can the whistle is

The higher the of an ecosystem, the higher its _.