9478 + Interview Questions in Physics Page 145 InterviewSolution

7201.	A wheel is making revolutions about its axis with uniform angular acceleration. Starting from rest, it reaches 100 rev/sec in 4 seconds. Find the angular acceleration.
Answer» A wheel is making revolutions about its axis with uniform angular acceleration. Starting from rest, it reaches 100 rev/sec in 4 seconds. Find the angular acceleration.

Discussion

7202.	Which two planets that have asteroid belt between them?
Answer» Which two planets that have asteroid belt between them?

Discussion

7203.	An inflated balloon is rubbed with a woollen cloth and in another case, a ballpen refill is rubbed with polythene. When they are brought closer, it is observed that they attract each other. Which of the following conclusions can be made from this?
Answer» An inflated balloon is rubbed with a woollen cloth and in another case, a ballpen refill is rubbed with polythene. When they are brought closer, it is observed that they attract each other. Which of the following conclusions can be made from this?

Discussion

7204.	According to Newton's universal Gravitational laws, any two object that have masses exerts gravitational force but why.
Answer» According to Newton's universal Gravitational laws, any two object that have masses exerts gravitational force but why.

Discussion

7205.	Is light a ray or a wave ?
Answer» Is light a ray or a wave ?

Discussion

7206.	Solid sodium chloride does not conduct electricity while sodium chloride solution conducts. Explain why.
Answer» Solid sodium chloride does not conduct electricity while sodium chloride solution conducts. Explain why.

Discussion

7207.	Which of the following will remain unchanged when a sound wave travels in air or in water?
Answer» Which of the following will remain unchanged when a sound wave travels in air or in water?

Discussion

7208.	A wire is bent in the shape of a right-angled triangle and is placed in front of a concave mirror of focal length f, as shown in the figure. Which of the figures shown in the four options qualitatively represent(s) the shape of the image of the bent wire? (These figures are not to scale.)?
Answer» A wire is bent in the shape of a right-angled triangle and is placed in front of a concave mirror of focal length f, as shown in the figure. Which of the figures shown in the four options qualitatively represent(s) the shape of the image of the bent wire? (These figures are not to scale.)?

Discussion

7209.	Which of the following experiences a buoyant force?
Answer» Which of the following experiences a buoyant force?

Discussion

7210.	(a + x) (a - x) (a2 - x2)
Answer» (a + x) (a - x) (a² - x²)

Discussion

7211.	An arrow fired from a bow vertically upwards, attains a maximum height of 5 m from the ground. If the mass of the arrow is 500 g, calculate the work done by the bow on the arrow (Take g = 10 ms−1).
Answer» An arrow fired from a bow vertically upwards, attains a maximum height of $5 m$ from the ground. If the mass of the arrow is $500 g$ , calculate the work done by the bow on the arrow (Take g = $10 m s^{- 1}$ ).

Discussion

7212.	Which one of following is not easy to break?
Answer» Which one of following is not easy to break?

Discussion

7213.	What is the base unit of electrical current?
Answer» What is the base unit of electrical current?

Discussion

7214.	State one use of kaleidoscope.
Answer» State one use of kaleidoscope.

Discussion

7215.	COHESION is the force of attraction between molecules of ____________ substances
Answer» COHESION is the force of attraction between molecules of ____________ substances

Discussion

7216.	Which of the following is a precautionary method to follow during an earthquake when you are outside?
Answer» Which of the following is a precautionary method to follow during an earthquake when you are outside?

Discussion

7217.	How does the strings of stringed instrument changes the pitch and frequency
Answer» How does the strings of stringed instrument changes the pitch and frequency

Discussion

7218.	Two identical guitars are played by two persons to give notes of the same pitch. Will they differ in quality ? Give reason for your answer.
Answer» Two identical guitars are played by two persons to give notes of the same pitch. Will they differ in quality ? Give reason for your answer.

Discussion

7219.	5 m= _______ cm.
Answer» $5 m =$ _______ $c m$ .

Discussion

7220.	A farmer wants to grow grass on half of his square shaped field of side 13 m and plough the remaining land. Find the area of land used up to grow the grass.
Answer» A farmer wants to grow grass on half of his square shaped field of side $13 m$ and plough the remaining land. Find the area of land used up to grow the grass.

Discussion

7221.	Why does a matchstick light when we strike it on a rough surface ?
Answer» Why does a matchstick light when we strike it on a rough surface ?

Discussion

7222.	By which effect does lightning strike happen?
Answer» By which effect does lightning strike happen?

Discussion

7223.	Fill in the blanks : (a) Boiling occurs at ___ (b) Evaporation takes place at ___ (c) The molecules of liquid ___ heat from surroundings in evaporation. (d) Heat is ___ during boiling. (e) Cooling is produced in ___ (f) A longer rod expands ___ than a shorter rod on being heated to the same temperature. (g) Liquids expand ___ than the solids. (h) Gases expand ___ than the liquids. (i) Alcohol expands ___ than water. (j) Iron expands ___ than copper.
Answer» Fill in the blanks : (a) Boiling occurs at ___ (b) Evaporation takes place at ___ (c) The molecules of liquid ___ heat from surroundings in evaporation. (d) Heat is ___ during boiling. (e) Cooling is produced in ___ (f) A longer rod expands ___ than a shorter rod on being heated to the same temperature. (g) Liquids expand ___ than the solids. (h) Gases expand ___ than the liquids. (i) Alcohol expands ___ than water. (j) Iron expands ___ than copper.

7223.

Fill in the blanks : (a) Boiling occurs at _ (b) Evaporation takes place at _ (c) The molecules of liquid _ heat from surroundings in evaporation. (d) Heat is _ during boiling. (e) Cooling is produced in _ (f) A longer rod expands _ than a shorter rod on being heated to the same temperature. (g) Liquids expand _ than the solids. (h) Gases expand _ than the liquids. (i) Alcohol expands _ than water. (j) Iron expands _ than copper.

Answer»

Fill in the blanks :

(a) Boiling occurs at ___

(b) Evaporation takes place at ___

(c) The molecules of liquid ___ heat from surroundings in evaporation.

(d) Heat is ___ during boiling.

(e) Cooling is produced in ___

(f) A longer rod expands ___ than a shorter rod on being heated to the same temperature.

(g) Liquids expand ___ than the solids.

(h) Gases expand ___ than the liquids.

(i) Alcohol expands ___ than water.

(j) Iron expands ___ than copper.

Discussion

7224.	If we can express infinity=infinity/1,then will rational numbers be closed under division,as 1/0=infinity/1?
Answer» If we can express infinity=infinity/1,then will rational numbers be closed under division,as 1/0=infinity/1?

7224.

If we can express infinity=infinity/1,then will rational numbers be closed under division,as 1/0=infinity/1?

Answer»

If we can express infinity=infinity/1,then will rational numbers be closed under division,as

1/0=infinity/1?

Discussion

7225.	Sounds of same loudness and pitch but produced by different musical instruments like violin and flute are distinguishable. Why? Give reason.
Answer» Sounds of same loudness and pitch but produced by different musical instruments like violin and flute are distinguishable. Why? Give reason.

Discussion

7226.	In an experiment, a charged object attracts another object. What can be the state of the attracted object for this to happen?
Answer» In an experiment, a charged object attracts another object. What can be the state of the attracted object for this to happen?

Discussion

7227.	Simplify 2723912⋅ 332
Answer» Simplify $\frac{27^{\frac{2}{3}}}{9^{\frac{1}{2}} \cdot 3^{\frac{3}{2}}}$

Discussion

7228.	How does friction make an ball roll
Answer» How does friction make an ball roll

Discussion

7229.	Some meteors are large so that they can reach the Earth before they evaporate completely. The body that reaches the Earth is called
Answer» Some meteors are large so that they can reach the Earth before they evaporate completely. The body that reaches the Earth is called

Discussion

7230.	Identify the incorrectly used verb in the sentence. The broken watch begin working on its own.
Answer» Identify the incorrectly used verb in the sentence. The broken watch begin working on its own.

7230.

Identify the incorrectly used verb in the sentence. The broken watch begin working on its own.

Answer»

Identify the incorrectly used verb in the sentence.

The broken watch begin working on its own.

Discussion

7231.	The equation of motion of a particle is x= 3cos(0.45t+π/4)m. Its maximum acceleration is
Answer» The equation of motion of a particle is x= 3cos(0.45t+π/4)m. Its maximum acceleration is

Discussion

7232.	The volume of 100g of a substance is 20cm3. If the density of water is 1 gcm−3, the substance will sink in it.
Answer» The volume of 100g of a substance is $20 c m^{3}$ . If the density of water is 1 $g c m^{- 3}$ , the substance will sink in it.

Discussion

7233.	What is atmospheric pressure due to?
Answer» What is atmospheric pressure due to?

Discussion

7234.	√1+x/144=13/12 find x
Answer» √1+x/144=13/12 find x

Discussion

7235.	Explain giving two examples each of : (a) Contact forces, and (b) Non-o contact forces.
Answer» Explain giving two examples each of : (a) Contact forces, and (b) Non-o contact forces.

Discussion

7236.	Which of the following is an example of bioluminescence ?
Answer» Which of the following is an example of bioluminescence ?

Discussion

7237.	The frequency of a vibrating body is 5 Hz. Calculate its time period?
Answer» The frequency of a vibrating body is 5 Hz. Calculate its time period?

Discussion

7238.	What is the angle of incidence of a ray if the reflected ray is at an angle of 90 degree to the incident ray?
Answer» What is the angle of incidence of a ray if the reflected ray is at an angle of 90 degree to the incident ray?

Discussion

7239.	A car when passes through a convex bridge exerts a force on it which is equal to
Answer» A car when passes through a convex bridge exerts a force on it which is equal to

Discussion

7240.	A machine has a velocity ratio of 4. If It is used to raise a load of 400 N by 4 m using an effort of 20kgf, find the work done on the machine. Take g = 10 m/s2 .
Answer» A machine has a velocity ratio of 4. If It is used to raise a load of 400 N by 4 m using an effort of 20kgf, find the work done on the machine. Take g = 10 m/s $^{2}$ .

Discussion

7241.	What is the main reason for lateral inversion?
Answer» What is the main reason for lateral inversion?

Discussion

7242.	We can see a non–luminous object when light:
Answer» We can see a non–luminous object when light:

Discussion

7243.	When an object is placed at the focus of a concave mirror,where will the image be formed?
Answer» When an object is placed at the focus of a concave mirror,where will the image be formed?

Discussion

7244.	The __________ in ear senses the vibrations of sound.
Answer» The __________ in ear senses the vibrations of sound.

Discussion

7245.	How do cyclones decrease the fertility of soil in the coastal areas?
Answer» How do cyclones decrease the fertility of soil in the coastal areas?

Discussion

7246.	How did soil appear on earth?
Answer» How did soil appear on earth?

Discussion

7247.	If the image formed by a mirror is upright and diminished irrespective of the distance between the object and the mirror, what can you say about the type of mirror?
Answer» If the image formed by a mirror is upright and diminished irrespective of the distance between the object and the mirror, what can you say about the type of mirror?

Discussion

7248.	The size of an earthquake is expressed in terms of magnitude on a scale called ___.
Answer» The size of an earthquake is expressed in terms of magnitude on a scale called ___.

Discussion

7249.	For change of state, ___.
Answer» For change of state, ___.

Discussion

7250.	Give an example to show the conversion of potential energy to kinetic energy when put in use.
Answer» Give an example to show the conversion of potential energy to kinetic energy when put in use.

Discussion

Explore topic-wise InterviewSolutions in .

A wheel is making revolutions about its axis with uniform angular acceleration. Starting from rest, it reaches 100 rev/sec in 4 seconds. Find the angular acceleration.

Which two planets that have asteroid belt between them?

An inflated balloon is rubbed with a woollen cloth and in another case, a ballpen refill is rubbed with polythene. When they are brought closer, it is observed that they attract each other. Which of the following conclusions can be made from this?

According to Newton's universal Gravitational laws, any two object that have masses exerts gravitational force but why.

Is light a ray or a wave ?

Solid sodium chloride does not conduct electricity while sodium chloride solution conducts. Explain why.

Which of the following will remain unchanged when a sound wave travels in air or in water?

A wire is bent in the shape of a right-angled triangle and is placed in front of a concave mirror of focal length f, as shown in the figure. Which of the figures shown in the four options qualitatively represent(s) the shape of the image of the bent wire? (These figures are not to scale.)?

Which of the following experiences a buoyant force?

(a + x) (a - x) (a2 - x2)

An arrow fired from a bow vertically upwards, attains a maximum height of 5 m from the ground. If the mass of the arrow is 500 g, calculate the work done by the bow on the arrow (Take g = 10 ms−1).

Which one of following is not easy to break?

What is the base unit of electrical current?

State one use of kaleidoscope.

COHESION is the force of attraction between molecules of ____________ substances

Which of the following is a precautionary method to follow during an earthquake when you are outside?

How does the strings of stringed instrument changes the pitch and frequency

Two identical guitars are played by two persons to give notes of the same pitch. Will they differ in quality ? Give reason for your answer.

5 m= _______ cm.

A farmer wants to grow grass on half of his square shaped field of side 13 m and plough the remaining land. Find the area of land used up to grow the grass.

Why does a matchstick light when we strike it on a rough surface ?

By which effect does lightning strike happen?

If we can express infinity=infinity/1,then will rational numbers be closed under division,as 1/0=infinity/1?

Sounds of same loudness and pitch but produced by different musical instruments like violin and flute are distinguishable. Why? Give reason.

In an experiment, a charged object attracts another object. What can be the state of the attracted object for this to happen?

Simplify 2723912⋅ 332

How does friction make an ball roll

Some meteors are large so that they can reach the Earth before they evaporate completely. The body that reaches the Earth is called

Identify the incorrectly used verb in the sentence. The broken watch begin working on its own.

The equation of motion of a particle is x= 3cos(0.45t+π/4)m. Its maximum acceleration is

The volume of 100g of a substance is 20cm3. If the density of water is 1 gcm−3, the substance will sink in it.

What is atmospheric pressure due to?

√1+x/144=13/12 find x

Explain giving two examples each of : (a) Contact forces, and (b) Non-o contact forces.

Which of the following is an example of bioluminescence ?

The frequency of a vibrating body is 5 Hz. Calculate its time period?

What is the angle of incidence of a ray if the reflected ray is at an angle of 90 degree to the incident ray?

A car when passes through a convex bridge exerts a force on it which is equal to

A machine has a velocity ratio of 4. If It is used to raise a load of 400 N by 4 m using an effort of 20kgf, find the work done on the machine. Take g = 10 m/s2 .

What is the main reason for lateral inversion?

We can see a non–luminous object when light:

When an object is placed at the focus of a concave mirror,where will the image be formed?

The __________ in ear senses the vibrations of sound.

How do cyclones decrease the fertility of soil in the coastal areas?

How did soil appear on earth?

If the image formed by a mirror is upright and diminished irrespective of the distance between the object and the mirror, what can you say about the type of mirror?

The size of an earthquake is expressed in terms of magnitude on a scale called ___.

For change of state, ___.

Give an example to show the conversion of potential energy to kinetic energy when put in use.