9478 + Interview Questions in Physics Page 80 InterviewSolution

3951.	In what time (in seconds) should a charge of 10 C flow between the two terminals so as to maintain a constant current of 100 A?
Answer» In what time (in seconds) should a charge of 10 C flow between the two terminals so as to maintain a constant current of 100 A?

Discussion

3952.	If a bullet hits a Planck and get passed through it and it velocity is reduced by 10% .How many Planck ar required to bring the bullet at Halt or at rest.
Answer» If a bullet hits a Planck and get passed through it and it velocity is reduced by 10% .How many Planck ar required to bring the bullet at Halt or at rest .

Discussion

3953.	The melting point of the substances which contract on melting (like ice) decreases by the ______ in pressure.
Answer» The melting point of the substances which contract on melting (like ice) decreases by the ______ in pressure.

Discussion

3954.	Find torque of a force F=(2i-j+5k)N acting at a point of position vector (i+j-k) about a point (2,0,-1).
Answer» Find torque of a force F=(2i-j+5k)N acting at a point of position vector (i+j-k) about a point (2,0,-1).

Discussion

3955.	Question 8 In a large commercial complex, there are four ways to reach the main road. One of the paths has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has a gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is (a) Granite surface (b) polished marble (c) Tile floor (d) gravel
Answer» Question 8 In a large commercial complex, there are four ways to reach the main road. One of the paths has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has a gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is (a) Granite surface (b) polished marble (c) Tile floor (d) gravel

Discussion

3956.	What is the importance of radial magnetic field and how is it produced??
Answer» What is the importance of radial magnetic field and how is it produced??

Discussion

3957.	A certain current liberates 0.5g of hydrogen in 2hrs. How many grams of copper can be deposited by the same current flowing for the same time in a copper sulphate solution? (1)12.7g (2)15.9g (3)31.8g (4)63.5g
Answer» A certain current liberates 0.5g of hydrogen in 2hrs. How many grams of copper can be deposited by the same current flowing for the same time in a copper sulphate solution? (1)12.7g (2)15.9g (3)31.8g (4)63.5g

Discussion

3958.	Select appropriate articles for the blanks. _____ boy fell down _____ flight of stairs but was not seriously wounded.
Answer» Select appropriate articles for the blanks. _____ boy fell down _____ flight of stairs but was not seriously wounded.

3958.

Select appropriate articles for the blanks. _ boy fell down _ flight of stairs but was not seriously wounded.

Answer»

Select appropriate articles for the blanks.

_____ boy fell down _____ flight of stairs but was not seriously wounded.

Discussion

3959.	A negative charge
Answer» A negative charge

Discussion

3960.	What will be the number of images formed when an object is placed between two parallel plane mirrors facing each other ?
Answer» What will be the number of images formed when an object is placed between two parallel plane mirrors facing each other ?

Discussion

3961.	Suppose the masses of the calorimeter, the water in it and the hot object made up of copper which is put in the calorimeter are the same. The initial temperature of the calorimeter and water is 30∘C and that of the hot object is 60∘C. The specific heats of copper and water are 0.09calg−1∘C−1 and 1calg−1∘C−1 respectively. What will be the final temperature of water?
Answer» Suppose the masses of the calorimeter, the water in it and the hot object made up of copper which is put in the calorimeter are the same. The initial temperature of the calorimeter and water is $30^{\circ} C$ and that of the hot object is $60^{\circ} C$ . The specific heats of copper and water are $0.09 c a l g^{- 1}^{\circ} C^{- 1}$ and $1 c a l g^{- 1}^{\circ} C^{- 1}$ respectively. What will be the final temperature of water?

Discussion

3962.	An R-2R ladder type DAC is as shown below:If R = 10 KΩ, with binary input 010, then the output voltage V0 is______V.5
Answer» An R-2R ladder type DAC is as shown below: If R = 10 K $Ω$ , with binary input 010, then the output voltage $V_{0}$ is______V. 5

Discussion

3963.	Why do we use a plane mirror while getting ready?
Answer» Why do we use a plane mirror while getting ready?

Discussion

3964.

When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. What is the reason behind the rise of water in the dropper?

Answer»

When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. What is the reason behind the rise of water in the dropper?

Discussion

3965.	What should be the temperature rise of a brass rod , so as to increase its length by 1%? (Given: coefficient of linear expansion of glass rod, α=2×10−5∘C−1).
Answer» What should be the temperature rise of a brass rod , so as to increase its length by $1 %$ ? (Given: coefficient of linear expansion of glass rod, $α = 2 \times 10^{- 5}^{\circ} C^{- 1})$ .

Discussion

3966.	Minimum wavelength possible for the spectral line present in Balmer series is
Answer» Minimum wavelength possible for the spectral line present in Balmer series is

Discussion

3967.	Fill in the blanks.(a) Angle of incidence = ___________.(b) The incident ray, the reflected ray and the normal lie in same ______.(c) The image formed by a plane mirror is at a distance behind the mirror as_________.(d) The image formed by a plane mirror is erect and ______.(e) We are able to see the objects around us due to ______ reflection.
Answer» Fill in the blanks. (a) Angle of incidence = ___________. (b) The incident ray, the reflected ray and the normal lie in same ______. (c) The image formed by a plane mirror is at a distance behind the mirror as_________. (d) The image formed by a plane mirror is erect and ______. (e) We are able to see the objects around us due to ______ reflection.

3967.

Fill in the blanks.(a) Angle of incidence = _____.(b) The incident ray, the reflected ray and the normal lie in same .(c) The image formed by a plane mirror is at a distance behind the mirror as_.(d) The image formed by a plane mirror is erect and .(e) We are able to see the objects around us due to ____ reflection.

Answer»

Fill in the blanks.

(a) Angle of incidence = ___________.

(b) The incident ray, the reflected ray and the normal lie in same ______.

(c) The image formed by a plane mirror is at a distance behind the mirror as_________.

(d) The image formed by a plane mirror is erect and ______.

(e) We are able to see the objects around us due to ______ reflection.

Discussion

3968.	3 Give scientific reason: (A) object appear coloured when viewed through a prism
Answer» 3 Give scientific reason: (A) object appear coloured when viewed through a prism

3968.

3 Give scientific reason: (A) object appear coloured when viewed through a prism

Answer»

3 Give scientific reason:

(A) object appear coloured when viewed through a prism

Discussion

3969.	are van der waal cons†an t 'a' and 'b' temp and pressure dependent
Answer» are van der waal cons†an t 'a' and 'b' temp and pressure dependent

Discussion

3970.	The SI unit of force is___
Answer» The SI unit of force is___

Discussion

3971.	Are all the particle moves with an tangential acceleration and radial acceleration and what is formulae to fid tangential acceleration
Answer» Are all the particle moves with an tangential acceleration and radial acceleration and what is formulae to fid tangential acceleration

Discussion

3972.	Sound waves of frequency 660 Hz fall normally on a perfectly reflecting wall. The shortest distance from the wall at which the air particle has maximum amplitude of vibration is (velocity of sound in air is 330 m/s)
Answer» Sound waves of frequency $660 Hz$ fall normally on a perfectly reflecting wall. The shortest distance from the wall at which the air particle has maximum amplitude of vibration is (velocity of sound in air is $330 m/s)$

Discussion

3973.	In a house there are six 100 W bulb, which are used for 6 hours per day. Calculate the energy consumed in kWh in a day.
Answer» In a house there are six $100 W$ bulb, which are used for $6 h o u r s$ per day. Calculate the energy consumed in $k W h$ in a day.

Discussion

3974.	31. If az + bz +1 = 0, where a, b belong to complex
Answer» 31. If az + bz +1 = 0, where a, b belong to complex

Discussion

3975.	How will you explain the statement 'we cannot see the objects in a dark room?
Answer» How will you explain the statement 'we cannot see the objects in a dark room?

Discussion

3976.	why angle of incidence is taken between 30 ^° and 60^° while performkng the activity with glass slab
Answer» why angle of incidence is taken between 30 ^° and 60^° while performkng the activity with glass slab

Discussion

3977.	A printed page is kept pressed by a glass cube (μ = 1.5) of height 6.0 cm. By what amount will the printed letters appear to be shifted when viewed from the top?
Answer» A printed page is kept pressed by a glass cube ( $μ$ = 1.5) of height 6.0 cm. By what amount will the printed letters appear to be shifted when viewed from the top?

Discussion

3978.	<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->With reference to Indian satellites and their launchers,consider the following statements:1. All the INSAT series satellites were launched from outside India.2. PSLVs were used to launch IRS-series of satellites.3. India used the indigenously built cryogenic engines for the first time for powering the third stage of GSLV.4. GSAT, launched in the year 2001, has payloads to demonstrate digital broadcasts and internet services.Which of these statements are correct?
Answer» <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> With reference to Indian satellites and their launchers,consider the following statements: 1. All the INSAT series satellites were launched from outside India. 2. PSLVs were used to launch IRS-series of satellites. 3. India used the indigenously built cryogenic engines for the first time for powering the third stage of GSLV. 4. GSAT, launched in the year 2001, has payloads to demonstrate digital broadcasts and internet services. Which of these statements are correct?

Discussion

3979.	Is it possible that a force changes only in the direction of motion without any change in the speed of the object. illustrate your answer with example.
Answer» Is it possible that a force changes only in the direction of motion without any change in the speed of the object. illustrate your answer with example.

Discussion

3980.	Choose the correct statement
Answer» Choose the correct statement

Discussion

3981.	The partial pressure of hydrogen in a flask containing 2 g H2, and 32gSO
Answer» The partial pressure of hydrogen in a flask containing 2 g H2, and 32gSO

Discussion

3982.	When the free ends of a tester are dipped into a solution the magnetic needle shows deflection can you explain the reason
Answer» When the free ends of a tester are dipped into a solution the magnetic needle shows deflection can you explain the reason

Discussion

3983.	Question 11Lightning can be seen the moment it occurs. Paheli observes lightning in her area. She hears the sound 5 s after she observed lightning. How far is she from the place where lightning occurs? (speed of sound = 330 m/s).
Answer» Question 11 Lightning can be seen the moment it occurs. Paheli observes lightning in her area. She hears the sound 5 s after she observed lightning. How far is she from the place where lightning occurs? (speed of sound = 330 m/s).

Discussion

3984.	What is a kaleidoscope? Name its working principle and list down some of its uses. [2 Marks]
Answer» What is a kaleidoscope? Name its working principle and list down some of its uses. [2 Marks]

Discussion

3985.	20ml of a solution containing 0.2g of impure sample of H2O2 reacts with 0.316g of KMnO4 in acidic medium. If the % purity of H2O2 is x then value of (x+5)/10 is
Answer» 20ml of a solution containing 0.2g of impure sample of H2O2 reacts with 0.316g of KMnO4 in acidic medium. If the % purity of H2O2 is x then value of (x+5)/10 is

Discussion

3986.	The volume of a metal sphere increases by 0.24%when its temperature is raised by 400C. The coefficient of linearexpansion of the metal is
Answer» The volume of a metal sphere increases by 0.24% when its temperature is raised by 40⁰C. The coefficient of linear expansion of the metal is

Discussion

3987.	How does thrust and the nature of surfaces affect friction? Explain.
Answer» How does thrust and the nature of surfaces affect friction? Explain.

Discussion

3988.	Question 5 (a)Give reason.Water is not used to control fires involving electrical equipment.
Answer» Question 5 (a) Give reason. Water is not used to control fires involving electrical equipment.

Discussion

3989.	Why does a bowler rub the cricket ball on his clothes before his cricket match?
Answer» Why does a bowler rub the cricket ball on his clothes before his cricket match?

Discussion

3990.	Two planets P1 and P2 have masses in the ratio 1:2 and radii in ratio 2:1. Assuming them to be spheres of uniform densities, find the ratio of density of P1 to the density of P2, the ratio of escape velocities from their surface and the ratio of time period of satellite near their surface
Answer» Two planets P1 and P2 have masses in the ratio 1:2 and radii in ratio 2:1. Assuming them to be spheres of uniform densities, find the ratio of density of P1 to the density of P2, the ratio of escape velocities from their surface and the ratio of time period of satellite near their surface

Discussion

3991.	Question 8Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.
Answer» Question 8 Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

Discussion

3992.	Explain why a balloon bursts when too much air is blown into it?
Answer» Explain why a balloon bursts when too much air is blown into it?

Discussion

3993.	State any two precautions which should be observed by people living in seismic zones for protection against earthquakes.
Answer» State any two precautions which should be observed by people living in seismic zones for protection against earthquakes.

Discussion

3994.	what is the power of lamp is luminous intensity it 42 candle and Luminous efficiency is to
Answer» what is the power of lamp is luminous intensity it 42 candle and Luminous efficiency is to

Discussion

3995.	A motor car of mass 1200 kg is moving along a straight line with a uniform velocity of 90 kmph. Its velocity is slowed down to 18 kmph in 4 seconds by an external force. The acceleration of the body is:
Answer» A motor car of mass 1200 kg is moving along a straight line with a uniform velocity of 90 $k m p h$ . Its velocity is slowed down to 18 $k m p h$ in 4 seconds by an external force. The acceleration of the body is:

Discussion

3996.	Drop of liquid is falling from the top of a building of height 20 m at regular interval such that when 1st drop reaches the ground ,third is about to fall ,then find the time interval between the
Answer» Drop of liquid is falling from the top of a building of height 20 m at regular interval such that when 1st drop reaches the ground ,third is about to fall ,then find the time interval between the

Discussion

3997.	Question 14 How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?
Answer» Question 14 How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

Discussion

3998.	The given graph represent the variation of z compressibility factor z=pv/nRT versis p fpr three real gases A,B,C identify only incorrect statement
Answer» The given graph represent the variation of z compressibility factor z=pv/nRT versis p fpr three real gases A,B,C identify only incorrect statement

Discussion

3999.	Mercury weighs more than water. Would the pressure exerted by water is greater or less than the pressure exerted by the same amount of mercury?
Answer» Mercury weighs more than water. Would the pressure exerted by water is greater or less than the pressure exerted by the same amount of mercury?

Discussion

4000.	Identify the phenomenon common to the following pictures.
Answer» Identify the phenomenon common to the following pictures.

Discussion

Explore topic-wise InterviewSolutions in .

In what time (in seconds) should a charge of 10 C flow between the two terminals so as to maintain a constant current of 100 A?

If a bullet hits a Planck and get passed through it and it velocity is reduced by 10% .How many Planck ar required to bring the bullet at Halt or at rest.

The melting point of the substances which contract on melting (like ice) decreases by the ______ in pressure.

Find torque of a force F=(2i-j+5k)N acting at a point of position vector (i+j-k) about a point (2,0,-1).

What is the importance of radial magnetic field and how is it produced??

A certain current liberates 0.5g of hydrogen in 2hrs. How many grams of copper can be deposited by the same current flowing for the same time in a copper sulphate solution? (1)12.7g (2)15.9g (3)31.8g (4)63.5g

Select appropriate articles for the blanks. _____ boy fell down _____ flight of stairs but was not seriously wounded.

A negative charge

What will be the number of images formed when an object is placed between two parallel plane mirrors facing each other ?

An R-2R ladder type DAC is as shown below:If R = 10 KΩ, with binary input 010, then the output voltage V0 is______V.5

Why do we use a plane mirror while getting ready?

When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. What is the reason behind the rise of water in the dropper?

What should be the temperature rise of a brass rod , so as to increase its length by 1%? (Given: coefficient of linear expansion of glass rod, α=2×10−5∘C−1).

Minimum wavelength possible for the spectral line present in Balmer series is

3 Give scientific reason: ​​​​​(A) object appear coloured when viewed through a prism

are van der waal cons†an t 'a' and 'b' temp and pressure dependent

The SI unit of force is___

Are all the particle moves with an tangential acceleration and radial acceleration and what is formulae to fid tangential acceleration

Sound waves of frequency 660 Hz fall normally on a perfectly reflecting wall. The shortest distance from the wall at which the air particle has maximum amplitude of vibration is (velocity of sound in air is 330 m/s)

In a house there are six 100 W bulb, which are used for 6 hours per day. Calculate the energy consumed in kWh in a day.

31. If az + bz +1 = 0, where a, b belong to complex

How will you explain the statement 'we cannot see the objects in a dark room?

why angle of incidence is taken between 30 ^° and 60^° while performkng the activity with glass slab

A printed page is kept pressed by a glass cube (μ = 1.5) of height 6.0 cm. By what amount will the printed letters appear to be shifted when viewed from the top?

Is it possible that a force changes only in the direction of motion without any change in the speed of the object.​​​​ illustrate your answer with example.

Choose the correct statement

The partial pressure of hydrogen in a flask containing 2 g H2, and 32gSO

When the free ends of a tester are dipped into a solution the magnetic needle shows deflection can you explain the reason

Question 11Lightning can be seen the moment it occurs. Paheli observes lightning in her area. She hears the sound 5 s after she observed lightning. How far is she from the place where lightning occurs? (speed of sound = 330 m/s).

What is a kaleidoscope? Name its working principle and list down some of its uses. [2 Marks]

20ml of a solution containing 0.2g of impure sample of H2O2 reacts with 0.316g of KMnO4 in acidic medium. If the % purity of H2O2 is x then value of (x+5)/10 is

The volume of a metal sphere increases by 0.24%when its temperature is raised by 400C. The coefficient of linearexpansion of the metal is

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

Question 5 (a)Give reason.Water is not used to control fires involving electrical equipment.

Why does a bowler rub the cricket ball on his clothes before his cricket match?

Two planets P1 and P2 have masses in the ratio 1:2 and radii in ratio 2:1. Assuming them to be spheres of uniform densities, find the ratio of density of P1 to the density of P2, the ratio of escape velocities from their surface and the ratio of time period of satellite near their surface

Question 8Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

Explain why a balloon bursts when too much air is blown into it?

State any two precautions which should be observed by people living in seismic zones for protection against earthquakes.

what is the power of lamp is luminous intensity it 42 candle and Luminous efficiency is to

A motor car of mass 1200 kg is moving along a straight line with a uniform velocity of 90 kmph. Its velocity is slowed down to 18 kmph in 4 seconds by an external force. The acceleration of the body is:

Drop of liquid is falling from the top of a building of height 20 m at regular interval such that when 1st drop reaches the ground ,third is about to fall ,then find the time interval between the

Question 14 How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

The given graph represent the variation of z compressibility factor z=pv/nRT versis p fpr three real gases A,B,C identify only incorrect statement

Mercury weighs more than water. Would the pressure exerted by water is greater or less than the pressure exerted by the same amount of mercury?

Identify the phenomenon common to the following pictures.

Select appropriate articles for the blanks. _ boy fell down _ flight of stairs but was not seriously wounded.

3 Give scientific reason: (A) object appear coloured when viewed through a prism

Is it possible that a force changes only in the direction of motion without any change in the speed of the object. illustrate your answer with example.