9478 + Interview Questions in Physics Page 37 InterviewSolution

1801.	Name the phenomenon which enables us to see movies in a cinema hall.
Answer» Name the phenomenon which enables us to see movies in a cinema hall.

Discussion

1802.	In a video, they have told that sound waves are not always longitudinal, they can be transverse also. But, they didn't give an example. In my school, when I tried to tell my teacher the same thing, she said that "Sound waves are always longitudinal. " So, who is correct? Please justify.
Answer» In a video, they have told that sound waves are not always longitudinal, they can be transverse also. But, they didn't give an example. In my school, when I tried to tell my teacher the same thing, she said that "Sound waves are always longitudinal. " So, who is correct? Please justify.

Discussion

1803.	Name two events (other than earthquakes) which can cause tremors on the earth.
Answer» Name two events (other than earthquakes) which can cause tremors on the earth.

Discussion

1804.	Why is it advised to cut off power supply and switch off all electrical appliances at the time of a flood?
Answer» Why is it advised to cut off power supply and switch off all electrical appliances at the time of a flood?

Discussion

1805.	Which of the following statement is true with respect to a thunderstorm?
Answer» Which of the following statement is true with respect to a thunderstorm?

Discussion

1806.	Question 15A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g=10 m/s2, find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone?
Answer» Question 15 A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking $g = 10 m / s^{2}$ , find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone?

Discussion

1807.	A particle is at rest at t = 0. If acceleration of the particle is given as a=sinπt+cosπt in unit then the maximum speed of the particle is
Answer» A particle is at rest at t = 0. If acceleration of the particle is given as $a = s i n π t + c o s π t$ in unit then the maximum speed of the particle is

Discussion

1808.	Give one example of the chemical effect of electric current.
Answer» Give one example of the chemical effect of electric current.

Discussion

1809.	How potential difference varies when cell is discharging
Answer» How potential difference varies when cell is discharging

Discussion

1810.	Observe the following figure and identify electrolyte Z.
Answer» Observe the following figure and identify electrolyte Z.

Discussion

1811.	(X/3)+(y/4)=11; (5x/6)-(y/3+7)=0 Find x and y
Answer» (X/3)+(y/4)=11; (5x/6)-(y/3+7)=0 Find x and y

Discussion

1812.	The Moon takes 27 days to complete a revolution around the earth but it takes 29 days to come back to a full moon. Why??
Answer» The Moon takes 27 days to complete a revolution around the earth but it takes 29 days to come back to a full moon. Why??

Discussion

1813.	Which of the following options illustrate the advantageous effects of friction?
Answer» Which of the following options illustrate the advantageous effects of friction?

Discussion

1814.	If two mirrors are kept inclined to each other at an angle of 60 degrees, the number of images of the object formed is:
Answer» If two mirrors are kept inclined to each other at an angle of 60 degrees, the number of images of the object formed is:

Discussion

1815.	Question 13Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?
Answer» Question 13 Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?

Discussion

1816.	When more than one force acts on an object, the effect on the object is due to the _______ force acting on it.
Answer» When more than one force acts on an object, the effect on the object is due to the _______ force acting on it.

Discussion

1817.	Why is rolling a cylinder easier than pushing a cube of the same mass and same material?
Answer» Why is rolling a cylinder easier than pushing a cube of the same mass and same material?

Discussion

1818.	An evacuated glass vessel weighs 49 g. When filled with liquid of 0.95 g cm^{-3} density, it weighs 144 g and if filled with gas at 760 mm Hg and 27℃ temperature, it weighs 49.5 g. The molar mass of the gas is (1) 189 g/mol (2) 123 g/mol (3) 100 g/mol (4) 95 g/mol
Answer» An evacuated glass vessel weighs 49 g. When filled with liquid of 0.95 g cm^{-3} density, it weighs 144 g and if filled with gas at 760 mm Hg and 27℃ temperature, it weighs 49.5 g. The molar mass of the gas is (1) 189 g/mol (2) 123 g/mol (3) 100 g/mol (4) 95 g/mol

Discussion

1819.	Name two metals which are usually electroplated on cheaper metals for making jewellery (or ornaments).
Answer» Name two metals which are usually electroplated on cheaper metals for making jewellery (or ornaments).

Discussion

1820.	Why is heat proportional to I^2 and not I(Current)?
Answer» Why is heat proportional to I^2 and not I(Current)?

Discussion

1821.

Match theterms of column A correctly with the phrases given in column B. A B (i) Polyester (a) Prepared by using wood pulp (ii) Teflon (b) Used for making parachutes and stockings (iii) Rayon (c) Used to make non-stick cookware (iv) Nylon (d) Fabrics do not wrinkle easily

Answer»

Match the
terms of column A correctly with the phrases given in column B.

A		B
(i)	Polyester	(a)	Prepared by using wood pulp
(ii)	Teflon	(b)	Used for making parachutes and stockings
(iii)	Rayon	(c)	Used to make non-stick cookware
(iv)	Nylon	(d)	Fabrics do not wrinkle easily

Discussion

1822.	Which planet rotates from east to west about sun?
Answer» Which planet rotates from east to west about sun?

Discussion

1823.	Why do stars twinkle on a clear night?
Answer» Why do stars twinkle on a clear night?

Discussion

1824.	What is the difference between acceleration and instantaneous acceleration.
Answer» What is the difference between acceleration and instantaneous acceleration.

Discussion

1825.	A train at rest tends to move from the platform and it attains a speed of 100 km/hr after a few minutes. While trying to attain that speed, what force(s) does it need to overcome?
Answer» A train at rest tends to move from the platform and it attains a speed of $100 k m / h r$ after a few minutes. While trying to attain that speed, what force(s) does it need to overcome?

Discussion

1826.	Faites des questions avec les éléments donnés en employant le futur.1. Il/recevoir/des cadeaux.2. Nous/acheter/une voiture.3. On/faire/de la planche à voile.4. Elle/aller/à Beaubourg.
Answer» Faites des questions avec les éléments donnés en employant le futur. 1. Il/recevoir/des cadeaux. 2. Nous/acheter/une voiture. 3. On/faire/de la planche à voile. 4. Elle/aller/à Beaubourg.

Discussion

1827.	Friction is a type of
Answer» Friction is a type of

Discussion

1828.	The distance of the centres of moon and earth is D. The mass of earth is 81 times the mass of the moon. At what distance from the centre if the earth, the gravitational force on a particle will be zero.
Answer» The distance of the centres of moon and earth is $D$ . The mass of earth is $81$ times the mass of the moon. At what distance from the centre if the earth, the gravitational force on a particle will be zero.

Discussion

1829.	How p type extrensic semiconductor conduct electricity
Answer» How p type extrensic semiconductor conduct electricity

Discussion

1830.	What should be the direction of the movement of propellers in a quadcopter? And what can be the max. weight 4small size motor can withstand and make it fly(quadcopter).
Answer» What should be the direction of the movement of propellers in a quadcopter? And what can be the max. weight 4small size motor can withstand and make it fly(quadcopter).

Discussion

1831.	An wngine running at speed v/10 sounds a whistle of frequency 600 Hz .A passanger in a train coming from the opposite side at speed v/15 experiences this whistle to be of frequency f.If v is speed if wind f is nearest to
Answer» An wngine running at speed v/10 sounds a whistle of frequency 600 Hz .A passanger in a train coming from the opposite side at speed v/15 experiences this whistle to be of frequency f.If v is speed if wind f is nearest to

Discussion

1832.	Moment of a force of magnitude 20 N acting along positive x direction at point (3m, 0, 0) about the point (0, 2,0)(in Nm) is(1) 20(3) 40(2) 60(4) 30
Answer» Moment of a force of magnitude 20 N acting along positive x direction at point (3m, 0, 0) about the point (0, 2,0)(in Nm) is(1) 20(3) 40(2) 60(4) 30

Discussion

1833.	Statement 1: Poor conductors do not allow electric current to flow through them.Statement 2: Poor conductors do not allow electric current to flow through them easily.
Answer» Statement 1: Poor conductors do not allow electric current to flow through them. Statement 2: Poor conductors do not allow electric current to flow through them easily.

1833.

Statement 1: Poor conductors do not allow electric current to flow through them.Statement 2: Poor conductors do not allow electric current to flow through them easily.

Answer»

Statement 1: Poor conductors do not allow electric current to flow through them.

Statement 2: Poor conductors do not allow electric current to flow through them easily.

Discussion

1834.	The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration? [2 MARKS]
Answer» The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration? [2 MARKS]

Discussion

1835.	a cuboid of dimensions 3x2x1 if the pressure exerted by cuboid is 10 pa then find the force
Answer» a cuboid of dimensions 3x2x1 if the pressure exerted by cuboid is 10 pa then find the force

Discussion

1836.	A piece of wood is 3 m long, 2 m wide, and has a thickness of 1 m. Find its density, if the wood's mass is 2 kg.
Answer» A piece of wood is $3 m$ long, $2 m$ wide, and has a thickness of $1 m$ . Find its density, if the wood's mass is $2 k g$ .

Discussion

1837.	What do you mean by fluid friction? Which factors affect fluid friction?
Answer» What do you mean by fluid friction? Which factors affect fluid friction?

Discussion

1838.	How does thrust and the nature of surfaces affect friction? Explain.
Answer» How does thrust and the nature of surfaces affect friction? Explain.

Discussion

1839.	Identify the correct relationship between loudness and amplitude.
Answer» Identify the correct relationship between loudness and amplitude.

Discussion

1840.	Potential difference is measured using a _______
Answer» Potential difference is measured using a _______

Discussion

1841.	Question 4 (a)The planet which is farthest from the sun is _________.
Answer» Question 4 (a) The planet which is farthest from the sun is _________.

1841.

Question 4 (a)The planet which is farthest from the sun is _________.

Answer»

Question 4 (a)

The planet which is farthest from the sun is _________.

Discussion

1842.	29.Find the force required to move a train of mass 2000 quintals up an incline of 1 in 50, with an acceleration of 2m/s2 . The force of friction being 0.5N/quintal.
Answer» 29.Find the force required to move a train of mass 2000 quintals up an incline of 1 in 50, with an acceleration of 2m/s2 . The force of friction being 0.5N/quintal.

Discussion

1843.	In an energy recycling process, X g of steam at 100°C becomes water at 100°C which converts Y g of ice at 0°C into water at 100°C. The ratio X/Y will be
Answer» In an energy recycling process, $X g$ of steam at 100°C becomes water at 100°C which converts $Y$ g of ice at 0°C into water at 100°C. The ratio $X / Y$ will be

Discussion

1844.	Why is the barometer height used as a unit to express the atmospheric pressure?
Answer» Why is the barometer height used as a unit to express the atmospheric pressure?

Discussion

1845.	Two formula cars in a race have the same mass but their kinetic energies are different. The ratio of their kinetic energies is 1:16. What would be the corresponding ratio of their velocities?
Answer» Two formula cars in a race have the same mass but their kinetic energies are different. The ratio of their kinetic energies is 1:16. What would be the corresponding ratio of their velocities?

Discussion

1846.	What is the damage caused by lightning? How will you create awareness to prevent it?
Answer» What is the damage caused by lightning? How will you create awareness to prevent it?

Discussion

1847.	The specific conductance of 0.01M solution of KCl is 0.0014per ohm cm at 25^°C .It's equivalent conductance is
Answer» The specific conductance of 0.01M solution of KCl is 0.0014per ohm cm at 25^°C .It's equivalent conductance is

Discussion

1848.	Density of a body depends on its shape and size
Answer» Density of a body depends on its shape and size

Discussion

1849.	calculate the molarity of a 13% w/w solution of h2so4 if density is not give
Answer» calculate the molarity of a 13% w/w solution of h2so4 if density is not give

Discussion

1850.	12. Two substances A and B are present such that IAl 4Blo and half life of A is 5 minute and that of B is 15 minute. If they start decaying at the same time following first order, kinetics how much time will the concentration of both of them would be the same? (1) 15 minute (3) 5 minute (2) 10 minute (4) 12 minute
Answer» 12. Two substances A and B are present such that IAl 4Blo and half life of A is 5 minute and that of B is 15 minute. If they start decaying at the same time following first order, kinetics how much time will the concentration of both of them would be the same? (1) 15 minute (3) 5 minute (2) 10 minute (4) 12 minute

Discussion

Explore topic-wise InterviewSolutions in .

Name the phenomenon which enables us to see movies in a cinema hall.

In a video, they have told that sound waves are not always longitudinal, they can be transverse also. But, they didn't give an example. In my school, when I tried to tell my teacher the same thing, she said that "Sound waves are always longitudinal. " So, who is correct? Please justify.

Name two events (other than earthquakes) which can cause tremors on the earth.

Why is it advised to cut off power supply and switch off all electrical appliances at the time of a flood?

Which of the following statement is true with respect to a thunderstorm?

Question 15A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g=10 m/s2, find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone?

A particle is at rest at t = 0. If acceleration of the particle is given as a=sinπt+cosπt in unit then the maximum speed of the particle is

Give one example of the chemical effect of electric current.

How potential difference varies when cell is discharging

Observe the following figure and identify electrolyte Z.

(X/3)+(y/4)=11; (5x/6)-(y/3+7)=0 Find x and y

The Moon takes 27 days to complete a revolution around the earth but it takes 29 days to come back to a full moon. Why??

Which of the following options illustrate the advantageous effects of friction?

If two mirrors are kept inclined to each other at an angle of 60 degrees, the number of images of the object formed is:

Question 13Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?

When more than one force acts on an object, the effect on the object is due to the _______ force acting on it.

Why is rolling a cylinder easier than pushing a cube of the same mass and same material?

An evacuated glass vessel weighs 49 g. When filled with liquid of 0.95 g cm^{-3} density, it weighs 144 g and if filled with gas at 760 mm Hg and 27℃ temperature, it weighs 49.5 g. The molar mass of the gas is (1) 189 g/mol (2) 123 g/mol (3) 100 g/mol (4) 95 g/mol

Name two metals which are usually electroplated on cheaper metals for making jewellery (or ornaments).

Why is heat proportional to I^2 and not I(Current)?

Match theterms of column A correctly with the phrases given in column B. A B (i) Polyester (a) Prepared by using wood pulp (ii) Teflon (b) Used for making parachutes and stockings (iii) Rayon (c) Used to make non-stick cookware (iv) Nylon (d) Fabrics do not wrinkle easily

Which planet rotates from east to west about sun?

Why do stars twinkle on a clear night?

What is the difference between acceleration and instantaneous acceleration.

A train at rest tends to move from the platform and it attains a speed of 100 km/hr after a few minutes. While trying to attain that speed, what force(s) does it need to overcome?

Faites des questions avec les éléments donnés en employant le futur.1. Il/recevoir/des cadeaux.2. Nous/acheter/une voiture.3. On/faire/de la planche à voile.4. Elle/aller/à Beaubourg.

Friction is a type of

The distance of the centres of moon and earth is D. The mass of earth is 81 times the mass of the moon. At what distance from the centre if the earth, the gravitational force on a particle will be zero.

How p type extrensic semiconductor conduct electricity

What should be the direction of the movement of propellers in a quadcopter? And what can be the max. weight 4small size motor can withstand and make it fly(quadcopter). ​​​​​​ ​​​​​​

An wngine running at speed v/10 sounds a whistle of frequency 600 Hz .A passanger in a train coming from the opposite side at speed v/15 experiences this whistle to be of frequency f.If v is speed if wind f is nearest to

Moment of a force of magnitude 20 N acting along positive x direction at point (3m, 0, 0) about the point (0, 2,0)(in Nm) is(1) 20(3) 40(2) 60(4) 30

Statement 1: Poor conductors do not allow electric current to flow through them.Statement 2: Poor conductors do not allow electric current to flow through them easily.

The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration? [2 MARKS]

a cuboid of dimensions 3x2x1 if the pressure exerted by cuboid is 10 pa then find the force

A piece of wood is 3 m long, 2 m wide, and has a thickness of 1 m. Find its density, if the wood's mass is 2 kg.

What do you mean by fluid friction? Which factors affect fluid friction?

How does thrust and the nature of surfaces affect friction? Explain.

Identify the correct relationship between loudness and amplitude.

Potential difference is measured using a _______

Question 4 (a)The planet which is farthest from the sun is _________.

29.Find the force required to move a train of mass 2000 quintals up an incline of 1 in 50, with an acceleration of 2m/s2 . The force of friction being 0.5N/quintal.

In an energy recycling process, X g of steam at 100°C becomes water at 100°C which converts Y g of ice at 0°C into water at 100°C. The ratio X/Y will be

Why is the barometer height used as a unit to express the atmospheric pressure?

Two formula cars in a race have the same mass but their kinetic energies are different. The ratio of their kinetic energies is 1:16. What would be the corresponding ratio of their velocities?

What is the damage caused by lightning? How will you create awareness to prevent it?

The specific conductance of 0.01M solution of KCl is 0.0014per ohm cm at 25^°C .It's equivalent conductance is

Density of a body depends on its shape and size

calculate the molarity of a 13% w/w solution of h2so4 if density is not give

What should be the direction of the movement of propellers in a quadcopter? And what can be the max. weight 4small size motor can withstand and make it fly(quadcopter).