16569 + Interview Questions in Physics

1.	A long solenoid wire of radius &quota" carries a steady current i.The Current is uniformly distributed across its cross section .The ratio of magnetic field at a/2 and 2a is
Answer» A long solenoid wire of radius "a" carries a steady current i.The Current is uniformly distributed across its cross section .The ratio of magnetic field at a/2 and 2a is

Discussion

2.	Three bulbs red, green, and yellow flash at intervals of 80,90, and 110 seconds. all three flashes together at 8:00 am. when will they flash altogether again?
Answer» Three bulbs red, green, and yellow flash at intervals of 80,90, and 110 seconds. all three flashes together at 8:00 am. when will they flash altogether again?

Discussion

3.	The distance of a particle moving on a circle of radius 12 m measured from a fixed point on the circle and measured along the circle is given by s =2t cube in metres the ratio of its tangential to centripetal acceleration at t=2s is
Answer» The distance of a particle moving on a circle of radius 12 m measured from a fixed point on the circle and measured along the circle is given by s =2t cube in metres the ratio of its tangential to centripetal acceleration at t=2s is

Discussion

4.	Power of 2 toasters is 40 w its voltage is 2200 find the resistance
Answer» Power of 2 toasters is 40 w its voltage is 2200 find the resistance

Discussion

5.	A bulb is located on a wall .Its image is to be obtained on a wall. Its image is to be obtained on parallel wall with the help of a convex lens If the dis†an ce between the two walls is d then required focal length will b
Answer» A bulb is located on a wall .Its image is to be obtained on a wall. Its image is to be obtained on parallel wall with the help of a convex lens If the dis†an ce between the two walls is d then required focal length will b

Discussion

6.	Define Potential difference.
Answer» Define Potential difference.

Discussion

7.	A very reactive element was taken to the laboratory to observe its atomic structure, which was found to be 11. It was also observed that the first two orbits had 2 and 8 electrons respectively. What are the number of electrons present in the outermost shell?
Answer» A very reactive element was taken to the laboratory to observe its atomic structure, which was found to be 11. It was also observed that the first two orbits had 2 and 8 electrons respectively. What are the number of electrons present in the outermost shell?

Discussion

8.	Which of the following statements is not true for a lyophobic sol
Answer» Which of the following statements is not true for a lyophobic sol

Discussion

9.	What is the required resis†an ce of the heater coil of an immersion heater that will increase the tem perature of 1.50Kg of water from 10 degree C to 50 degree C in 10 minutes while operating at 240V? 1) 25 ohm 2) 12.5 ohm 3) 250 ohm 4) 125 ohm
Answer» What is the required resis†an ce of the heater coil of an immersion heater that will increase the tem perature of 1.50Kg of water from 10 degree C to 50 degree C in 10 minutes while operating at 240V? 1) 25 ohm 2) 12.5 ohm 3) 250 ohm 4) 125 ohm

Discussion

10.	e vernier scale of a travelling microscope has25 divisions which coincide with 24 main scaledivisions. If each main scale division is 0.5 mmthen least count of this microscope is2 0,02 mm(4) 0.01 mm(3) 0.1 mnm
Answer» e vernier scale of a travelling microscope has25 divisions which coincide with 24 main scaledivisions. If each main scale division is 0.5 mmthen least count of this microscope is2 0,02 mm(4) 0.01 mm(3) 0.1 mnm

Discussion

11.	Which radioisotope is used for tumor detection?
Answer» Which radioisotope is used for tumor detection?

Discussion

12.	29. the valu of the constant a>0 integrate 0 to a
Answer» 29. the valu of the constant a>0 integrate 0 to a

Discussion

13.	How much time from sunrise to sunset is lengthened because of atmospheric refraction?
Answer» How much time from sunrise to sunset is lengthened because of atmospheric refraction?

Discussion

14.	The temperature of equal masses of three different liquids A, B, C are 12∘C, 19∘C and 28∘C respectively. The temperature when A and B are mixed is 16∘C while when B and C are mixed, it is 23∘C. What would be the temperature when A and C are mixed assuming the same initial temperatures?
Answer» The temperature of equal masses of three different liquids $A$ , $B$ , $C$ are $12^{\circ} C$ , $19^{\circ} C$ and $28^{\circ} C$ respectively. The temperature when $A$ and $B$ are mixed is $16^{\circ} C$ while when $B$ and $C$ are mixed, it is $23^{\circ} C$ . What would be the temperature when $A$ and $C$ are mixed assuming the same initial temperatures?

Discussion

15.	How these statement is correct if a uniform magnetic field exist in a cubical region amd zero outside then it is not possible to project a charged particle from outside into the field so that it describes a complete circle in the field
Answer» How these statement is correct if a uniform magnetic field exist in a cubical region amd zero outside then it is not possible to project a charged particle from outside into the field so that it describes a complete circle in the field

Discussion

16.	If a person is reading a novel, then at what position his ciliary muscles are?
Answer» If a person is reading a novel, then at what position his ciliary muscles are?

Discussion

17.	Is there any Relation between potential difference and magnetic field?
Answer» Is there any Relation between potential difference and magnetic field?

Discussion

18.	An unknown box containing two electrical element . the V and I measurements reveal V = 100 sin πt and current is measured I = 10 sin (πt+π/4) identify the two element and average power loss in the circuit
Answer» An unknown box containing two electrical element . the V and I measurements reveal V = 100 sin πt and current is measured I = 10 sin (πt+π/4) identify the two element and average power loss in the circuit

Discussion

19.	If the velocity of light c ,planks constant h and gravitational constant G are taken as the fundamental units of a system,the dimensional formula of force in the system would be
Answer» If the velocity of light c ,planks constant h and gravitational constant G are taken as the fundamental units of a system,the dimensional formula of force in the system would be

Discussion

20.	A ray of light undergoes deviation of 30∘ when incident on an equitateral prism of refractive index √2. The angle subtended by the ray inside the prism with the base of the prism is
Answer» A ray of light undergoes deviation of $30^{\circ}$ when incident on an equitateral prism of refractive index $\sqrt{2} .$ The angle subtended by the ray inside the prism with the base of the prism is

Discussion

21.	A convex lens is a ................... and ................... is a divergent lens.
Answer» A convex lens is a ................... and ................... is a divergent lens.

Discussion

22.	Why a bulb glow so rapidly even if electrons move at very low speed?
Answer» Why a bulb glow so rapidly even if electrons move at very low speed?

Discussion

23.	The primary and secondary windings of a transformer are ____
Answer» The primary and secondary windings of a transformer are ____

Discussion

24.	ntA sound absorber attenuates the sound level by 20 dB.The intensity decreases by a factor ofn nta)1000n ntb)10000n ntc)10n ntd)100n
Answer» ntA sound absorber attenuates the sound level by 20 dB.The intensity decreases by a factor ofn nta)1000n ntb)10000n ntc)10n ntd)100n

Discussion

25.	The power received at distance d from a smallmetallic sphere of radius r(
Answer» The power received at distance d from a smallmetallic sphere of radius r(<

Discussion

26.	47.Mechanism of Dow process
Answer» 47.Mechanism of Dow process

Discussion

27.	In a half-wave rectifier, the rms value of the ac component of the wave is a) more than dc value b) equal to dc valuec) zero d) less than dc value
Answer» In a half-wave rectifier, the rms value of the ac component of the wave is a) more than dc value b) equal to dc value c) zero d) less than dc value

Discussion

28.	What is the electrophile in AsCl_3
Answer» What is the electrophile in AsCl_3

Discussion

29.	in the LR circuit R=10 ohm and L=2H if 120V 60Hz alternating voltage is applied then current in the circuit is
Answer» in the LR circuit R=10 ohm and L=2H if 120V 60Hz alternating voltage is applied then current in the circuit is

Discussion

30.	1kg of ice at 0°c is being continuously heated by a heater of 1KW calculate the time interval for ice to melt completely to water 0°c.and water to 100°
Answer» 1kg of ice at 0°c is being continuously heated by a heater of 1KW calculate the time interval for ice to melt completely to water 0°c.and water to 100°

Discussion

31.	105. A 50 Watt bulb connected in series with the heater coil is put to an AC mains now the bulb is replaced by a hundred watt bulb the heater output will 1) double 2) half 3) increase 4) decrease
Answer» 105. A 50 Watt bulb connected in series with the heater coil is put to an AC mains now the bulb is replaced by a hundred watt bulb the heater output will 1) double 2) half 3) increase 4) decrease

Discussion

32.	The direction of induced current is obtained by: (a) Fleming's left hand rule (b) Clock rule (c) Right hand thumb rule (d) Fleming's right hand rule.
Answer» The direction of induced current is obtained by: (a) Fleming's left hand rule (b) Clock rule (c) Right hand thumb rule (d) Fleming's right hand rule.

Discussion

33.	establish a relation between acceleration due to gravity and universal gravitional cons†an
Answer» establish a relation between acceleration due to gravity and universal gravitional cons†an

Discussion

34.	Power obtained in a reactor using uranium 235 disintegration is 1000kw.mass decay of uranium 235 per hour is
Answer» Power obtained in a reactor using uranium 235 disintegration is 1000kw.mass decay of uranium 235 per hour is

Discussion

35.	An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the bulb?
Answer» An electric bulb consumes $7.2 kJ$ of electrical energy in $2$ minutes. What is the power of the bulb?

Discussion

36.	A current carrying loop behaves like a
Answer» A current carrying loop behaves like a

Discussion

37.	A heater coil connected across a given potential differencre has power P. Now the coil is cut in to two equal halves and joined in parellel. across the same potential ifference ,this recombination has power (1)P (2) 2P (3) p/4 (4) 2
Answer» A heater coil connected across a given potential differencre has power P. Now the coil is cut in to two equal halves and joined in parellel. across the same potential ifference ,this recombination has power (1)P (2) 2P (3) p/4 (4) 2

Discussion

38.	Three moles of an ideal gas (CP=72R) at pressure, PA and temperature TA is isothermally expanded to twice its initial volume. It is then compressed at constant pressure to its original volume. Finally gas is compressed at constant volume to its original pressure PA.The correct P−V and P−T diagrams for the complete process are
Answer» Three moles of an ideal gas ( $C_{P} = \frac{7}{2} R$ ) at pressure, $P_{A}$ and temperature $T_{A}$ is isothermally expanded to twice its initial volume. It is then compressed at constant pressure to its original volume. Finally gas is compressed at constant volume to its original pressure $P_{A}$ . The correct $P - V$ and $P - T$ diagrams for the complete process are

Discussion

39.	calculate the wavelength will be needed to remove a electron from 3rd orbit of he+
Answer» calculate the wavelength will be needed to remove a electron from 3rd orbit of he+

Discussion

40.	In the given mirror:C – the centre of the sphere to which the mirror is part ofF – the focus of the mirrorP – pole of the mirrorA – a point on the mirrorD – a point on the principal axis.If a ray of light starts from C and is incident on the mirror at the point of incidence A, then the reflected ray will pass through which point?
Answer» In the given mirror: C – the centre of the sphere to which the mirror is part of F – the focus of the mirror P – pole of the mirror A – a point on the mirror D – a point on the principal axis. If a ray of light starts from C and is incident on the mirror at the point of incidence A, then the reflected ray will pass through which point?

40.

In the given mirror:C – the centre of the sphere to which the mirror is part ofF – the focus of the mirrorP – pole of the mirrorA – a point on the mirrorD – a point on the principal axis.If a ray of light starts from C and is incident on the mirror at the point of incidence A, then the reflected ray will pass through which point?

Answer»

In the given mirror:

C – the centre of the sphere to which the mirror is part of

F – the focus of the mirror

P – pole of the mirror

A – a point on the mirror

D – a point on the principal axis.

If a ray of light starts from C and is incident on the mirror at the point of incidence A, then the reflected ray will pass through which point?

Discussion

41.	An element has 10 electrons and 12 neutrons. What is the mass number of the element?
Answer» An element has 10 electrons and 12 neutrons. What is the mass number of the element?

Discussion

42.	Give the expression for force on a charged particle in magnetic field? (5Mark)Proper theory diagram and mathematical calcuations
Answer» Give the expression for force on a charged particle in magnetic field? (5Mark) Proper theory diagram and mathematical calcuations

Discussion

43.	(a) What is meant by the heating effect of current? State thee factors on which the heat produced in a wire by an electric current depends.(b) Explain why, though the heating element of an electric heater glows but its connecting cord does not glow.(c) An electric geyser of resistance 20 Ω takes a current of 5 A. Calculate the heat produced in 2 minutes.(d) Name the commercial unit of electric energy. How many joules are equal to this unit?
Answer» (a) What is meant by the heating effect of current? State thee factors on which the heat produced in a wire by an electric current depends. (b) Explain why, though the heating element of an electric heater glows but its connecting cord does not glow. (c) An electric geyser of resistance 20 Ω takes a current of 5 A. Calculate the heat produced in 2 minutes. (d) Name the commercial unit of electric energy. How many joules are equal to this unit?

Discussion

44.	What is the main source of UV rays?
Answer» What is the main source of UV rays?

44.

What is the main source of UV rays?

Answer»

What is the main source of UV rays?

Discussion

45.	90.Find out the frequency of AabbCcDdee if parents are AabbCCddEe and AabbccDdee
Answer» 90.Find out the frequency of AabbCcDdee if parents are AabbCCddEe and AabbccDdee

Discussion

46.	A microscope is focussed on a stone, tied to a string, lying at the bottom of an empty beaker. Now some oil is poured into it until it reaches to a height 'y' cm in the beaker. Therefore the microscope needs to be moved to 'x' cm to now focus at the stone clearly. Calculate the absolute refractive index of oil in terms of 'x' and 'y'.
Answer» A microscope is focussed on a stone, tied to a string, lying at the bottom of an empty beaker. Now some oil is poured into it until it reaches to a height 'y' cm in the beaker. Therefore the microscope needs to be moved to 'x' cm to now focus at the stone clearly. Calculate the absolute refractive index of oil in terms of 'x' and 'y'.

Discussion

47.	What would be the effect on the current if the resistance is increased while the voltage remained constant?
Answer» What would be the effect on the current if the resistance is increased while the voltage remained constant?

Discussion

48.	A magnetic field exerts no force on : (a) an electric charge moving perpendicular to its direction (b) an unmagnetised iron bar (c) a stationary eletric charge (d) a magnet
Answer» A magnetic field exerts no force on : (a) an electric charge moving perpendicular to its direction (b) an unmagnetised iron bar (c) a stationary eletric charge (d) a magnet

48.

A magnetic field exerts no force on : (a) an electric charge moving perpendicular to its direction (b) an unmagnetised iron bar (c) a stationary eletric charge (d) a magnet

Answer»

A magnetic field exerts no force on :

(a) an electric charge moving perpendicular to its direction (b) an unmagnetised iron bar

(c) a stationary eletric charge (d) a magnet

Discussion

49.	The refractive indices of glass and water with respect to air are 32 and 43 respectively. If the speed of light in glass is $2 \times 108~ m/s$. Find the speed of light in water.
Answer» The refractive indices of glass and water with respect to air are $\frac{3}{2}$ and $\frac{4}{3}$ respectively. If the speed of light in glass is $2 \times 108~ m/s$. Find the speed of light in water.

Discussion

50.	Explain the resting potential?
Answer» Explain the resting potential?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A long solenoid wire of radius &quota" carries a steady current i.The Current is uniformly distributed across its cross section .The ratio of magnetic field at a/2 and 2a is

Three bulbs red, green, and yellow flash at intervals of 80,90, and 110 seconds. all three flashes together at 8:00 am. when will they flash altogether again?

The distance of a particle moving on a circle of radius 12 m measured from a fixed point on the circle and measured along the circle is given by s =2t cube in metres the ratio of its tangential to centripetal acceleration at t=2s is

Power of 2 toasters is 40 w its voltage is 2200 find the resistance

A bulb is located on a wall .Its image is to be obtained on a wall. Its image is to be obtained on parallel wall with the help of a convex lens If the dis†an ce between the two walls is d then required focal length will b

Define Potential difference.

A very reactive element was taken to the laboratory to observe its atomic structure, which was found to be 11. It was also observed that the first two orbits had 2 and 8 electrons respectively. What are the number of electrons present in the outermost shell?

Which of the following statements is not true for a lyophobic sol

What is the required resis†an ce of the heater coil of an immersion heater that will increase the tem perature of 1.50Kg of water from 10 degree C to 50 degree C in 10 minutes while operating at 240V? 1) 25 ohm 2) 12.5 ohm 3) 250 ohm 4) 125 ohm

e vernier scale of a travelling microscope has25 divisions which coincide with 24 main scaledivisions. If each main scale division is 0.5 mmthen least count of this microscope is2 0,02 mm(4) 0.01 mm(3) 0.1 mnm

Which radioisotope is used for tumor detection?

29. the valu of the constant a>0 integrate 0 to a

How much time from sunrise to sunset is lengthened because of atmospheric refraction?

The temperature of equal masses of three different liquids A, B, C are 12∘C, 19∘C and 28∘C respectively. The temperature when A and B are mixed is 16∘C while when B and C are mixed, it is 23∘C. What would be the temperature when A and C are mixed assuming the same initial temperatures?

How these statement is correct if a uniform magnetic field exist in a cubical region amd zero outside then it is not possible to project a charged particle from outside into the field so that it describes a complete circle in the field

If a person is reading a novel, then at what position his ciliary muscles are?

Is there any Relation between potential difference and magnetic field?

An unknown box containing two electrical element . the V and I measurements reveal V = 100 sin πt and current is measured I = 10 sin (πt+π/4) identify the two element and average power loss in the circuit

If the velocity of light c ,planks constant h and gravitational constant G are taken as the fundamental units of a system,the dimensional formula of force in the system would be

A ray of light undergoes deviation of 30∘ when incident on an equitateral prism of refractive index √2. The angle subtended by the ray inside the prism with the base of the prism is

A convex lens is a ................... and ................... is a divergent lens.

Why a bulb glow so rapidly even if electrons move at very low speed?

The primary and secondary windings of a transformer are ____

ntA sound absorber attenuates the sound level by 20 dB.The intensity decreases by a factor ofn nta)1000n ntb)10000n ntc)10n ntd)100n

The power received at distance d from a smallmetallic sphere of radius r(

47.Mechanism of Dow process

In a half-wave rectifier, the rms value of the ac component of the wave is a) more than dc value b) equal to dc valuec) zero d) less than dc value

What is the electrophile in AsCl_3

in the LR circuit R=10 ohm and L=2H if 120V 60Hz alternating voltage is applied then current in the circuit is

1kg of ice at 0°c is being continuously heated by a heater of 1KW calculate the time interval for ice to melt completely to water 0°c.and water to 100°

105. A 50 Watt bulb connected in series with the heater coil is put to an AC mains now the bulb is replaced by a hundred watt bulb the heater output will 1) double 2) half 3) increase 4) decrease

The direction of induced current is obtained by: (a) Fleming's left hand rule (b) Clock rule (c) Right hand thumb rule (d) Fleming's right hand rule.

establish a relation between acceleration due to gravity and universal gravitional cons†an

Power obtained in a reactor using uranium 235 disintegration is 1000kw.mass decay of uranium 235 per hour is

An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the bulb?

A current carrying loop behaves like a

A heater coil connected across a given potential differencre has power P. Now the coil is cut in to two equal halves and joined in parellel. across the same potential ifference ,this recombination has power (1)P (2) 2P (3) p/4 (4) 2

calculate the wavelength will be needed to remove a electron from 3rd orbit of he+

An element has 10 electrons and 12 neutrons. What is the mass number of the element?

Give the expression for force on a charged particle in magnetic field? (5Mark)Proper theory diagram and mathematical calcuations

What is the main source of UV rays?

90.Find out the frequency of AabbCcDdee if parents are AabbCCddEe and AabbccDdee

What would be the effect on the current if the resistance is increased while the voltage remained constant?

A magnetic field exerts no force on : (a) an electric charge moving perpendicular to its direction (b) an unmagnetised iron bar (c) a stationary eletric charge (d) a magnet

The refractive indices of glass and water with respect to air are 32 and 43 respectively. If the speed of light in glass is \(2 \times 108~ m/s\). Find the speed of light in water.

Explain the resting potential?