16569 + Interview Questions in Physics Page 20 InterviewSolution

951.	If a charge,q moves from A to B , then which is correct relation.U(A)-U(B)= q[V(B)-V(A)]or, U(B)-U(A)=q[V(B)-V(A)]
Answer» If a charge,q moves from A to B , then which is correct relation. U(A)-U(B)= q[V(B)-V(A)] or, U(B)-U(A)=q[V(B)-V(A)]

Discussion

952.	अपनी कल्पना से वन के मार्ग का वर्णन कीजिए।
Answer» अपनी कल्पना से वन के मार्ग का वर्णन कीजिए।

Discussion

953.	A nuclear reactor has half the length of all its control rods inserted in graphite. What must be done so that the reactor produces more heat ? Explain your answer.
Answer» A nuclear reactor has half the length of all its control rods inserted in graphite. What must be done so that the reactor produces more heat ? Explain your answer.

Discussion

954.	What path does a ray of light travel when it suffers minimum deviation while passing through an equilateral prism?
Answer» What path does a ray of light travel when it suffers minimum deviation while passing through an equilateral prism?

Discussion

955.	a galilien telescope consists of an objective of focal length 12 cm ,eyepiece of focal length 4 cm .what should be the separation of two lenses when the virtual image of a distant object is formed at a dis†an ce of 24 cm from the eyepiece ? 1. 7.2 cm 2. 84 3.75 4. 88
Answer» a galilien telescope consists of an objective of focal length 12 cm ,eyepiece of focal length 4 cm .what should be the separation of two lenses when the virtual image of a distant object is formed at a dis†an ce of 24 cm from the eyepiece ? 1. 7.2 cm 2. 84 3.75 4. 88

Discussion

956.	why does the change in momentum does not vary when we change the inertial frame of reference?
Answer» why does the change in momentum does not vary when we change the inertial frame of reference?

Discussion

957.	Calculate the work done in bringing a charge 1X10^-9 C from infinity to a point distance 3 cm from a point charge 2X10^-6 C.
Answer» Calculate the work done in bringing a charge 1X10^-9 C from infinity to a point distance 3 cm from a point charge 2X10^-6 C.

Discussion

958.	Two bulbs have ratings 100 W, 220 V and 60 W, 220 V respectively. Which one has a greater resistance?
Answer» Two bulbs have ratings 100 W, 220 V and 60 W, 220 V respectively. Which one has a greater resistance?

Discussion

959.	A solenoid has self inductance of 5 mH and the current through it is given by i=10t2−20t where t is time in second. At what instant of time, the induced emf will be zero?
Answer» A solenoid has self inductance of $5 mH$ and the current through it is given by $i = 10 t^{2} - 20 t$ where $t$ is time in second. At what instant of time, the induced emf will be zero?

Discussion

960.	Water in lakes and ponds do not freeze at once in cold countries. Give reason.
Answer» Water in lakes and ponds do not freeze at once in cold countries. Give reason.

960.

Water in lakes and ponds do not freeze at once in cold countries. Give reason.

Answer»

Water in lakes and ponds do not freeze at once in cold countries. Give reason.

Discussion

961.	Statement 1: When white light ray passes through a prism, it disperses into seven different colours, and this phenomenon is called dispersion. Statement 2: In a refracting media, lights of different colour travel at different speed.
Answer» Statement 1: When white light ray passes through a prism, it disperses into seven different colours, and this phenomenon is called dispersion. Statement 2: In a refracting media, lights of different colour travel at different speed.

961.

Statement 1: When white light ray passes through a prism, it disperses into seven different colours, and this phenomenon is called dispersion. Statement 2: In a refracting media, lights of different colour travel at different speed.

Answer»

Statement 1: When white light ray passes through a prism, it disperses into seven different colours, and this phenomenon is called dispersion.

Statement 2: In a refracting media, lights of different colour travel at different speed.

Discussion

962.	The position of a particle is given by x=2t^2-t^3 then dis†an ce at 3 sec i
Answer» The position of a particle is given by x=2t^2-t^3 then dis†an ce at 3 sec i

Discussion

963.	The radiation 'P' is founded by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. Name the radiation P.
Answer» The radiation 'P' is founded by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. Name the radiation P.

Discussion

964.	Question 2The phenomenon of electromagnetic induction is(a) the process of charging a body.(b) the process of generating magnetic field due to a current passing through a coil.(c) producing induced current in a coil due to relative motion between a magnet and the coil.(d) the process of rotating a coil of an electric motor.
Answer» Question 2 The phenomenon of electromagnetic induction is (a) the process of charging a body. (b) the process of generating magnetic field due to a current passing through a coil. (c) producing induced current in a coil due to relative motion between a magnet and the coil. (d) the process of rotating a coil of an electric motor.

Discussion

965.	13.Calculate the quantity of charge in coulombs required to reduce 16.2g of p benzoquinone if current efficiency is 75 %
Answer» 13.Calculate the quantity of charge in coulombs required to reduce 16.2g of p benzoquinone if current efficiency is 75 %

Discussion

966.	In the figure shown below, ⨂ represents a wire carrying current towards inside the plane of the paper. At point P, the direction of magnetic field is given by -
Answer» In the figure shown below, $⨂$ represents a wire carrying current towards inside the plane of the paper. At point $P$ , the direction of magnetic field is given by -

Discussion

967.	The graph between V an I for a conductor is a straight line passing through the origin. (a) Which law is illustrated by such a graph? (b) What should remain constant in a statement of this law?
Answer» The graph between V an I for a conductor is a straight line passing through the origin. (a) Which law is illustrated by such a graph? (b) What should remain constant in a statement of this law?

Discussion

968.	The following arrangement consists of an ideal transformer and an attenuator which attenuates by a factor of 0.8. An ac voltage VWX1=100V is applied across WX to get an open circuit voltage VYZ1 across YZ. Next, an ac voltage VYZ2=100V is applied across YZ. Then, VYZ1/VWX1,VWX2/VYZ2 are respectively
Answer» The following arrangement consists of an ideal transformer and an attenuator which attenuates by a factor of $0.8.$ An ac voltage $V_{W X_{1}} = 100 V$ is applied across $W X$ to get an open circuit voltage $V_{Y Z_{1}}$ across $Y Z$ . Next, an ac voltage $V_{Y Z_{2}} = 100 V$ is applied across $Y Z$ . Then, $V_{Y Z_{1}} / V_{W X_{1}}, V_{W X_{2}} / V_{Y Z_{2}}$ are respectively

Discussion

969.	Which of the following plots represent the Charles' law for an ideal gas?
Answer» Which of the following plots represent the Charles' law for an ideal gas?

Discussion

970.	the length of a thin wire required to manufacture a solenoid of inductance L and length l , (if the cross sectional diameter is considered less than its length)
Answer» the length of a thin wire required to manufacture a solenoid of inductance L and length l , (if the cross sectional diameter is considered less than its length)

Discussion

971.	When the thumb is pointing in the ___, the direction of curl of fingers will be the direction of magnetic field lines.
Answer» When the thumb is pointing in the ___, the direction of curl of fingers will be the direction of magnetic field lines.

Discussion

972.	(a) In a H.P, find T19(b) In a H.P, find T7 and T12
Answer» (a) In a H.P, find T₁₉ (b) In a H.P, find T₇ and T₁₂

972.

(a) In a H.P, find T19(b) In a H.P, find T7 and T12

Answer»

(a) In a H.P, find T₁₉

(b) In a H.P, find T₇ and T₁₂

Discussion

973.	what is total number of charge carriers in intrinsic semiconductor of dimensions 1m1m0.01m having number of electrons n= 5*10^8 per cubic metre .
Answer» what is total number of charge carriers in intrinsic semiconductor of dimensions 1m1m0.01m having number of electrons n= 5*10^8 per cubic metre .

Discussion

974.	An infinitely long wire bent into shape as shown in the figure carries a steady current I . If the curved wire is along the curve y² = 4ax , then magnetic field at point P(a,0) would be
Answer» An infinitely long wire bent into shape as shown in the figure carries a steady current I . If the curved wire is along the curve y² = 4ax , then magnetic field at point P(a,0) would be

Discussion

975.	What is definition of charge?
Answer» What is definition of charge?

Discussion

976.	Question 17 Write two different ways of harnessing energy from ocean.
Answer» Question 17 Write two different ways of harnessing energy from ocean.

Discussion

977.	How can you identify the three types of mirrors without touching?
Answer» How can you identify the three types of mirrors without touching?

Discussion

978.	What is the lengh of thin wire required to manufacture a solenoid of inductance L and length l ( if the cross sectional diameter is considered less than its length) ?
Answer» What is the lengh of thin wire required to manufacture a solenoid of inductance L and length l ( if the cross sectional diameter is considered less than its length) ?

Discussion

979.	An electric heater of resistance 8Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
Answer» An electric heater of resistance $8 Ω$ draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

Discussion

980.	What is net deviation?
Answer» What is net deviation?

Discussion

981.	Which are the methods were used to study human evolution? [2 MARKS]
Answer» Which are the methods were used to study human evolution? [2 MARKS]

Discussion

982.	The electric field intensity at a point in vacuum is equal to
Answer» The electric field intensity at a point in vacuum is equal to

Discussion

983.	9.Two circular coils x and y having equal number of turns and carry equal currents in the same sense. If Bx and By represents the magnetic induction at O then (given d=2r, d/2=r) what is the ratio of Bx and By?
Answer» 9.Two circular coils x and y having equal number of turns and carry equal currents in the same sense. If Bx and By represents the magnetic induction at O then (given d=2r, d/2=r) what is the ratio of Bx and By?

Discussion

984.	Pure water does not conduct electricity. Why does addibg few drops of an acid to pure water make it conductiing?
Answer» Pure water does not conduct electricity. Why does addibg few drops of an acid to pure water make it conductiing?

Discussion

985.	A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.
Answer» A sonar device on a submarine sends out a signal and receives an echo $5 s$ later. Calculate the speed of sound in water if the distance of the object from the submarine is $3625 m$ .

Discussion

986.	In which of the following, scattering of light is not involved?
Answer» In which of the following, scattering of light is not involved?

Discussion

987.	149. In the network shown in fig.each resistance is 1ohm. The effective resistance b/w point A and B
Answer» 149. In the network shown in fig.each resistance is 1ohm. The effective resistance b/w point A and B

Discussion

988.	An object of height 10cm is kept at a distance of 150cm in front of a concave mirror having radius of curvature 2m. What is the nature,height and distance of image formed by the mirror ?
Answer» An object of height 10cm is kept at a distance of 150cm in front of a concave mirror having radius of curvature 2m. What is the nature,height and distance of image formed by the mirror ?

Discussion

989.	Q 14/50 An object is placed at a distance of 200 cm from a convex lens of focal length 150 cm. A convex mirror of focal length 50 cm is to be placed at the other side of the lens to have a real image of object coincident at the position of object. The distance of mirror from lens is Lens Mirror K 200 cm> O 12 m 7 m 5 m
Answer» Q 14/50 An object is placed at a distance of 200 cm from a convex lens of focal length 150 cm. A convex mirror of focal length 50 cm is to be placed at the other side of the lens to have a real image of object coincident at the position of object. The distance of mirror from lens is Lens Mirror K 200 cm> O 12 m 7 m 5 m

Discussion

990.	9. What is the EMF of the cell 1)0.40 volt 2)0.46 volt 3)0.50 volt 4)0.52 volt
Answer» 9. What is the EMF of the cell 1)0.40 volt 2)0.46 volt 3)0.50 volt 4)0.52 volt

Discussion

991.	This is the canteen. I eat my lunch here. This is the canteen where I eat my lunch. The sentence has been joined using
Answer» This is the canteen. I eat my lunch here. This is the canteen where I eat my lunch. The sentence has been joined using

991.

This is the canteen. I eat my lunch here. This is the canteen where I eat my lunch. The sentence has been joined using

Answer»

This is the canteen. I eat my lunch here.

This is the canteen where I eat my lunch.

The sentence has been joined using

Discussion

992.	21. An air-cored solenoid is of length 0.3 m. Area of cross section 1.2 103 m2 and has 2500 turns. Around itscentral section, a coil of 350 turns is wound. The solenoid and the coil are electrically insulated from eachother. Calculate the emf induced in the coil, if initial current of 3 A in the solenoid is reversed in 0.25 s.
Answer» 21. An air-cored solenoid is of length 0.3 m. Area of cross section 1.2 103 m2 and has 2500 turns. Around itscentral section, a coil of 350 turns is wound. The solenoid and the coil are electrically insulated from eachother. Calculate the emf induced in the coil, if initial current of 3 A in the solenoid is reversed in 0.25 s.

Discussion

993.	A 5.0 diopter lens forms a virtual image which is 4 times the object placed perpendicularly on the principal axis of the lens. Find the distance of the object from the lens.
Answer» A $5.0$ diopter lens forms a virtual image which is $4$ times the object placed perpendicularly on the principal axis of the lens. Find the distance of the object from the lens.

Discussion

994.	How does de-Broglie wavelength of a molecule vary with temperature?
Answer» How does de-Broglie wavelength of a molecule vary with temperature?

Discussion

995.	Two objects of mass 4 kg and 2 kg have the same momentum. Find the ratio of their kinetic energies.
Answer» Two objects of mass 4 kg and 2 kg have the same momentum. Find the ratio of their kinetic energies.

Discussion

996.	What is the use of sea waves at high and low tide and ocean currents?
Answer» What is the use of sea waves at high and low tide and ocean currents?

Discussion

997.	1)A vessel contains oil (density 0.8 g/cc) over Mercury( density 13.6 g/cc).a homogeneous sphere floats with half its volume immersed in Mercury and the othe half in the oil .the density of the material of the sphere in g/cc is. 2) the density of ice is Y gram/litre and that of water is X gram/litre. what is the change in volume when M gram of ice melts.
Answer» 1)A vessel contains oil (density 0.8 g/cc) over Mercury( density 13.6 g/cc).a homogeneous sphere floats with half its volume immersed in Mercury and the othe half in the oil .the density of the material of the sphere in g/cc is. 2) the density of ice is Y gram/litre and that of water is X gram/litre. what is the change in volume when M gram of ice melts.

997.

1)A vessel contains oil (density 0.8 g/cc) over Mercury( density 13.6 g/cc).a homogeneous sphere floats with half its volume immersed in Mercury and the othe half in the oil .the density of the material of the sphere in g/cc is. 2) the density of ice is Y gram/litre and that of water is X gram/litre. what is the change in volume when M gram of ice melts.

Answer»

1)A vessel contains oil (density 0.8 g/cc) over Mercury( density 13.6 g/cc).a homogeneous sphere floats with half its volume immersed in Mercury and the othe half in the oil .the density of the material of the sphere in g/cc is.

2) the density of ice is Y gram/litre and that of water is X gram/litre. what is the change in volume when M gram of ice melts.

Discussion

998.	For what value of R, the net resistance of the circuit will be 18 Ω?
Answer» For what value of $R$ , the net resistance of the circuit will be $18 Ω$ ?

Discussion

999.	What is galileo's ratio and where to use it?
Answer» What is galileo's ratio and where to use it?

Discussion

1000.	Write down the advantages and disadvantages how using fossil fuel as a source of energy.
Answer» Write down the advantages and disadvantages how using fossil fuel as a source of energy.

Discussion

Explore topic-wise InterviewSolutions in .

If a charge,q moves from A to B , then which is correct relation.U(A)-U(B)= q[V(B)-V(A)]or, U(B)-U(A)=q[V(B)-V(A)]

अपनी कल्पना से वन के मार्ग का वर्णन कीजिए।

A nuclear reactor has half the length of all its control rods inserted in graphite. What must be done so that the reactor produces more heat ? Explain your answer.

What path does a ray of light travel when it suffers minimum deviation while passing through an equilateral prism?

a galilien telescope consists of an objective of focal length 12 cm ,eyepiece of focal length 4 cm .what should be the separation of two lenses when the virtual image of a distant object is formed at a dis†an ce of 24 cm from the eyepiece ? 1. 7.2 cm 2. 84 3.75 4. 88

why does the change in momentum does not vary when we change the inertial frame of reference?

Calculate the work done in bringing a charge 1X10^-9 C from infinity to a point distance 3 cm from a point charge 2X10^-6 C.

Two bulbs have ratings 100 W, 220 V and 60 W, 220 V respectively. Which one has a greater resistance?

A solenoid has self inductance of 5 mH and the current through it is given by i=10t2−20t where t is time in second. At what instant of time, the induced emf will be zero?

Water in lakes and ponds do not freeze at once in cold countries. Give reason.

Statement 1: When white light ray passes through a prism, it disperses into seven different colours, and this phenomenon is called dispersion. Statement 2: In a refracting media, lights of different colour travel at different speed.

The position of a particle is given by x=2t^2-t^3 then dis†an ce at 3 sec i

The radiation 'P' is founded by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. Name the radiation P.

13.Calculate the quantity of charge in coulombs required to reduce 16.2g of p benzoquinone if current efficiency is 75 %

In the figure shown below, ⨂ represents a wire carrying current towards inside the plane of the paper. At point P, the direction of magnetic field is given by -

The graph between V an I for a conductor is a straight line passing through the origin. (a) Which law is illustrated by such a graph? (b) What should remain constant in a statement of this law?

Which of the following plots represent the Charles' law for an ideal gas?

the length of a thin wire required to manufacture a solenoid of inductance L and length l , (if the cross sectional diameter is considered less than its length)

When the thumb is pointing in the ___, the direction of curl of fingers will be the direction of magnetic field lines.

(a) In a H.P, find T19(b) In a H.P, find T7 and T12

what is total number of charge carriers in intrinsic semiconductor of dimensions 1m*1m*0.01m having number of electrons n= 5*10^8 per cubic metre .

An infinitely long wire bent into shape as shown in the figure carries a steady current I . If the curved wire is along the curve y² = 4ax , then magnetic field at point P(a,0) would be

What is definition of charge?

Question 17 Write two different ways of harnessing energy from ocean.

How can you identify the three types of mirrors without touching?

What is the lengh of thin wire required to manufacture a solenoid of inductance L and length l ( if the cross sectional diameter is considered less than its length) ?

An electric heater of resistance 8Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

What is net deviation?

Which are the methods were used to study human evolution? [2 MARKS]

The electric field intensity at a point in vacuum is equal to

9.Two circular coils x and y having equal number of turns and carry equal currents in the same sense. If Bx and By represents the magnetic induction at O then (given d=2r, d/2=r) what is the ratio of Bx and By?

Pure water does not conduct electricity. Why does addibg few drops of an acid to pure water make it conductiing?

A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.

In which of the following, scattering of light is not involved?

149. In the network shown in fig.each resistance is 1ohm. The effective resistance b/w point A and B

An object of height 10cm is kept at a distance of 150cm in front of a concave mirror having radius of curvature 2m. What is the nature,height and distance of image formed by the mirror ?

9. What is the EMF of the cell 1)0.40 volt 2)0.46 volt 3)0.50 volt 4)0.52 volt

This is the canteen. I eat my lunch here. This is the canteen where I eat my lunch. The sentence has been joined using

A 5.0 diopter lens forms a virtual image which is 4 times the object placed perpendicularly on the principal axis of the lens. Find the distance of the object from the lens.

How does de-Broglie wavelength of a molecule vary with temperature?

Two objects of mass 4 kg and 2 kg have the same momentum. Find the ratio of their kinetic energies.

What is the use of sea waves at high and low tide and ocean currents?

For what value of R, the net resistance of the circuit will be 18 Ω?

What is galileo's ratio and where to use it?

Write down the advantages and disadvantages how using fossil fuel as a source of energy.

what is total number of charge carriers in intrinsic semiconductor of dimensions 1m1m0.01m having number of electrons n= 5*10^8 per cubic metre .