16569 + Interview Questions in Physics

1.	In the figure given below, the current passing through 6 Ω resistor is
Answer» In the figure given below, the current passing through $6 Ω$ resistor is

Discussion

2.	Discuss the conservation of momentum in each of the following cases:(i) a rocket taking off from ground.(ii) flying of a jet aeroplane.
Answer» Discuss the conservation of momentum in each of the following cases: (i) a rocket taking off from ground. (ii) flying of a jet aeroplane.

Discussion

3.	In concave mirror At F how image will form? What do we understand by the term inverted?
Answer» In concave mirror At F how image will form? What do we understand by the term inverted?

Discussion

4.	23. WHAT IS THE TOTAL CHARGE ON 1 MOLE ELECTRONS ?? AND HOW
Answer» 23. WHAT IS THE TOTAL CHARGE ON 1 MOLE ELECTRONS ?? AND HOW

Discussion

5.	What is eman by deviation and aslo net deviation
Answer» What is eman by deviation and aslo net deviation

Discussion

6.	44.If the refractive index of a material of an equilateral prism is 1.73 then angle of the deviation will be?
Answer» 44.If the refractive index of a material of an equilateral prism is 1.73 then angle of the deviation will be?

Discussion

7.	Find the focal length of the lens shown in figure. The refractive index of lens material is 32.
Answer» Find the focal length of the lens shown in figure. The refractive index of lens material is $\frac{3}{2}$ .

Discussion

8.	calculate the resistance of a bulb rated 100w-220w what is the current flowing in the bulb when connected across a potential difference of 220v
Answer» calculate the resistance of a bulb rated 100w-220w what is the current flowing in the bulb when connected across a potential difference of 220v

Discussion

9.	Which of the following is contributed towards the extra stability of lyophilic colloids
Answer» Which of the following is contributed towards the extra stability of lyophilic colloids

Discussion

10.	A circular loop of area 5 x 10^(-2) m2 rotates in a uniform magnetic field of 0.2T .if the loop rotates about its diameter which is perpendicular to themagnetic field.find the magnetic flux if the plane is normal to the fieldand the plane is 60o with the field
Answer» A circular loop of area 5 x 10^(-2) m2 rotates in a uniform magnetic field of 0.2T .if the loop rotates about its diameter which is perpendicular to the magnetic field.find the magnetic flux if the plane is normal to the field and the plane is 60o with the field

Discussion

11.	The change in focal length of an eye lens is caused by the action of the –
Answer» The change in focal length of an eye lens is caused by the action of the –

Discussion

12.	An electron beam has an aperture 1.00 mm2. A total of 6.0×1016 electrons go through any perpendicular cross-section per second. Find the current(i) and the current density(j) of the beam.
Answer» An electron beam has an aperture $1.00 {mm}^{2}$ . A total of $6.0 \times 10^{16}$ electrons go through any perpendicular cross-section per second. Find the current $(i)$ and the current density $(j)$ of the beam.

Discussion

13.	Those liquids which can change into vapours easily are termed as __
Answer» Those liquids which can change into vapours easily are termed as __

Discussion

14.	2. The circle described on any focal chord of a parabola as diameter touches the direction.prove it
Answer» 2. The circle described on any focal chord of a parabola as diameter touches the direction.prove it

Discussion

15.	An insect is sitting at a distance of 80cm in front of a plane mirror. If it moves 0.20m towards the mirror then what will be the distance of the insect from its image now?
Answer» An insect is sitting at a distance of 80cm in front of a plane mirror. If it moves 0.20m towards the mirror then what will be the distance of the insect from its image now?

Discussion

16.	The manifestation of band structure in solids is due to
Answer» The manifestation of band structure in solids is due to

Discussion

17.	ntIn a fraunhofer diffraction at a single slit of width d with incident light of wavelength 5500 A,the first minimum is observed at angle of 30 degree. The first secondary maximum is observed at an angle theta, equal ton
Answer» ntIn a fraunhofer diffraction at a single slit of width d with incident light of wavelength 5500 A,the first minimum is observed at angle of 30 degree. The first secondary maximum is observed at an angle theta, equal ton

Discussion

18.	Velocity of light in diamond is 125000km/s. Calculate its RI w.r.t to air.
Answer» Velocity of light in diamond is 125000km/s. Calculate its RI w.r.t to air.

Discussion

19.	A piece of metal of mass 0.2 kg is transferred from a furnace to 0.15 kg of water at 0 k contained in a vessel of insulating material. The temperature of water rises to 30 k . Neglecting all leakages of heat, calculate the temperature of furnace . Given , specific heat capacity of the metal is 0.031 kcal kg -1 k-1
Answer» A piece of metal of mass 0.2 kg is transferred from a furnace to 0.15 kg of water at 0 k contained in a vessel of insulating material. The temperature of water rises to 30 k . Neglecting all leakages of heat, calculate the temperature of furnace . Given , specific heat capacity of the metal is 0.031 kcal kg -1 k-1

Discussion

20.	20.At what rate should Earth rotate so that apparent g at the equator become 0? what will be length of the day in this situation
Answer» 20.At what rate should Earth rotate so that apparent g at the equator become 0? what will be length of the day in this situation

Discussion

21.	Radius of curvature of both surfaces of lens is 60 cm. Find the focal length of the silvered lens.
Answer» Radius of curvature of both surfaces of lens is $60 cm$ . Find the focal length of the silvered lens.

Discussion

22.	Question 19Groundwater will not be depleted due to(a) afforestation(b) thermal power plants(c) loss of forest and decreased rainfall(d) cropping of high water demanding crops
Answer» Question 19 Groundwater will not be depleted due to (a) afforestation (b) thermal power plants (c) loss of forest and decreased rainfall (d) cropping of high water demanding crops

Discussion

23.	Why does light not escape black holes?
Answer» Why does light not escape black holes?

Discussion

24.	There are two charges +e and -4e placed at the separation of 1 metre so where should be the third charge +q be placed so that the net force on it is 0 ?
Answer» There are two charges +e and -4e placed at the separation of 1 metre so where should be the third charge +q be placed so that the net force on it is 0 ?

Discussion

25.	An object is seen through a glass slab of thickness 36 cm and refractive index 3/2. If the system of object, observer and the glass slab is dipped in the water(μ=4/3) keeping all the distances fixed, then the shift produced by the glass slab will be :
Answer» An object is seen through a glass slab of thickness $36 cm$ and refractive index $3 / 2$ . If the system of object, observer and the glass slab is dipped in the water $(μ = 4 / 3)$ keeping all the distances fixed, then the shift produced by the glass slab will be :

Discussion

26.	Why CFL is considered better than filament based electric bulbs?
Answer» Why CFL is considered better than filament based electric bulbs?

Discussion

27.	Question 2 What is meant by saying that the potential difference between two points is 1 V?
Answer» Question 2 What is meant by saying that the potential difference between two points is 1 V?

Discussion

28.	InvestigateIn thegiven figure, the angle measures 30°.Look at the same figure through a magnifying glass. Does the anglebecome larger? Does the size of the angle change?
Answer» Investigate In the given figure, the angle measures 30°. Look at the same figure through a magnifying glass. Does the angle become larger? Does the size of the angle change?

28.

InvestigateIn thegiven figure, the angle measures 30°.Look at the same figure through a magnifying glass. Does the anglebecome larger? Does the size of the angle change?

Answer»

Investigate

In the
given figure, the angle measures 30°.
Look at the same figure through a magnifying glass. Does the angle
become larger? Does the size of the angle change?

Discussion

29.	A coil of resistance 20 ohm and inductance 5 H has been connected to a 100 V battery. The energy stored in the coil is
Answer» A coil of resistance 20 ohm and inductance 5 H has been connected to a 100 V battery. The energy stored in the coil is

Discussion

30.	If a nucleus AZX emits an α− particle and a β− particle, then the daughter nucleus will have the total number of neutrons as A−Z−n=y. The value of n is (integer only)
Answer» If a nucleus $\begin{matrix} A Z \end{matrix} X$ emits an $α -$ particle and a $β -$ particle, then the daughter nucleus will have the total number of neutrons as $A - Z - n = y .$ The value of $n$ is (integer only)

Discussion

31.	State the various factors on which the electrical resistance of a conductor depends. How does it depend on these factors?
Answer» State the various factors on which the electrical resistance of a conductor depends. How does it depend on these factors?

Discussion

32.	A hot body placed in a surrounding of temperature θ0 obeys Newton's law of cooling dθdt=−k(θ−θ0) Its temperature at t = 0 is θ1. The specific heat capacity of the body is s and its mass is m. Find (i) the maximum heat that the body can lose and (ii) the time starting from t = 0 in which it will lose 90% of this maximum heat.
Answer» A hot body placed in a surrounding of temperature $θ_{0}$ obeys Newton's law of cooling $\frac{d θ}{d t} = - k (θ - θ_{0})$ Its temperature at t = 0 is θ1. The specific heat capacity of the body is s and its mass is m. Find (i) the maximum heat that the body can lose and (ii) the time starting from t = 0 in which it will lose 90 $%$ of this maximum heat.

Discussion

33.	Which of these can be considered as disadvantage of hydropower generation?
Answer» Which of these can be considered as disadvantage of hydropower generation?

Discussion

34.	ntThere are two cases. In the first case a spring (spring constant k) is pulled by two equal and opposite forces F at both ends and in second case one end of spring is fixed to a rigid support and other end is pulled by a force F. Extensions (x) in the string will ben
Answer» ntThere are two cases. In the first case a spring (spring constant k) is pulled by two equal and opposite forces F at both ends and in second case one end of spring is fixed to a rigid support and other end is pulled by a force F. Extensions (x) in the string will ben

Discussion

35.	Time period of thin bar magnet of vibration magnetometer is 'T'. If it cuts into two equal parts in then the time period of each part fashions. (a) Along or parallel to its length(b) Perpendicular to its length, (1)T, T(2)T, T/2(3)T/2, T(4)T/2, T/2
Answer» Time period of thin bar magnet of vibration magnetometer is 'T'. If it cuts into two equal parts in then the time period of each part fashions. (a) Along or parallel to its length (b) Perpendicular to its length, (1) T, T (2) T, T/2 (3) T/2, T (4) T/2, T/2

Discussion

36.	Question 2A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case(a) sound will be louder but pitch will not be different(b) sound will be louder and pitch will also be higher(c) sound will be louder but pitch will be lower(d) both loudness and pitch will remain unaffected
Answer» Question 2 A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case (a) sound will be louder but pitch will not be different (b) sound will be louder and pitch will also be higher (c) sound will be louder but pitch will be lower (d) both loudness and pitch will remain unaffected

Discussion

37.	EMF is induced by change in magnetic flux so how can a rod moving with velocity v in a uniform magnetic field have potential difference across its ends?
Answer» EMF is induced by change in magnetic flux so how can a rod moving with velocity v in a uniform magnetic field have potential difference across its ends?

Discussion

38.	Two metallic resistances R and 3R have their temperature coefficients of resistance a and 2a respectively. The effective temperature coefficient of their combination when they are connected in parallel will be 1) 3a 2) 4a/3 3) 4a/5 4) 5a/4
Answer» Two metallic resistances R and 3R have their temperature coefficients of resistance a and 2a respectively. The effective temperature coefficient of their combination when they are connected in parallel will be 1) 3a 2) 4a/3 3) 4a/5 4) 5a/4

Discussion

39.	In Fleming’s right hand rule
Answer» In Fleming’s right hand rule

Discussion

40.	With the help of a diagram, explain why the image of an object viewed through a concave lens appears smaller and closer than the object.
Answer» With the help of a diagram, explain why the image of an object viewed through a concave lens appears smaller and closer than the object.

Discussion

41.	Suppose we have coloured a CD in seven colours of rainbow and spin it at very high speed then we see it's colour as white. Why?
Answer» Suppose we have coloured a CD in seven colours of rainbow and spin it at very high speed then we see it's colour as white. Why?

Discussion

42.	Ficks principle?
Answer» Ficks principle?

Discussion

43.	Which of the following is correct for a 3-D hexagonal closed packing lattice ?Here Zeff=Total number of atoms in hcp latticeOv=Total number of octahedral voidsTv=Total number of tetrahedral voids
Answer» Which of the following is correct for a 3-D hexagonal closed packing lattice ? Here $Z_{e f f} = Total number of atoms in hcp lattice O_{v} = Total number of octahedral voids T_{v} = Total number of tetrahedral voids$

Discussion

44.	a particle of mass m is thrown upward from the surface of earth with a velocity u the mass and radius of earth are repectively M and R G is gravitational constant and g is accelaration due to gravity on the surface of earth the minimum value of u so that the particle does not return back to earth
Answer» a particle of mass m is thrown upward from the surface of earth with a velocity u the mass and radius of earth are repectively M and R G is gravitational constant and g is accelaration due to gravity on the surface of earth the minimum value of u so that the particle does not return back to earth

Discussion

45.	(b) What is the percentage composition by volume of a mixture of carbon monoxide and methane, 15 ml of which required 10 ml of oxygen for complete combustion?
Answer» (b) What is the percentage composition by volume of a mixture of carbon monoxide and methane, 15 ml of which required 10 ml of oxygen for complete combustion?

Discussion

46.	A man weighs 600N on the equator, but when he moves to the pole he finds a slight increase in his weight. This is because
Answer» A man weighs 600N on the equator, but when he moves to the pole he finds a slight increase in his weight. This is because

Discussion

47.	Write the steps to measure the diameter of a thin wire using screw gauge.
Answer» Write the steps to measure the diameter of a thin wire using screw gauge.

Discussion

48.	Why q is used to define electric field without the region of field?
Answer» Why q is used to define electric field without the region of field?

Discussion

49.	Find the current i in the circuit shown below.
Answer» Find the current $i$ in the circuit shown below.

Discussion

50.	A monochromatic light is traveling in a medium of refractive index n=1.6. It enters a stack of glass layer from the bottom side at an angle θ=30∘. The interfaces of the glass layers are parallel to each other. The refractive indices of different glass layer are monotonically decreasing as nm=n−mΔn, where nm is the refractive index of the mth slab and Δn=0.1 (see the figure). The ray is refracted out parallel to the interface between the (m−1)th and mth slabs from the right side of the stack. What is the value of m is
Answer» A monochromatic light is traveling in a medium of refractive index $n = 1.6$ . It enters a stack of glass layer from the bottom side at an angle $θ = 30^{\circ} .$ The interfaces of the glass layers are parallel to each other. The refractive indices of different glass layer are monotonically decreasing as $n_{m} = n - m Δ n$ , where $n_{m}$ is the refractive index of the $m^{t h}$ slab and $Δ n = 0.1$ (see the figure). The ray is refracted out parallel to the interface between the $(m - 1)^{t h}$ and $m^{t h}$ slabs from the right side of the stack. What is the value of $m$ is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In the figure given below, the current passing through 6 Ω resistor is

Discuss the conservation of momentum in each of the following cases:(i) a rocket taking off from ground.(ii) flying of a jet aeroplane.

In concave mirror At F how image will form? What do we understand by the term inverted?

23. WHAT IS THE TOTAL CHARGE ON 1 MOLE ELECTRONS ?? AND HOW

What is eman by deviation and aslo net deviation

44.If the refractive index of a material of an equilateral prism is 1.73 then angle of the deviation will be?

Find the focal length of the lens shown in figure. The refractive index of lens material is 32.

calculate the resistance of a bulb rated 100w-220w what is the current flowing in the bulb when connected across a potential difference of 220v

Which of the following is contributed towards the extra stability of lyophilic colloids

A circular loop of area 5 x 10^(-2) m2 rotates in a uniform magnetic field of 0.2T .if the loop rotates about its diameter which is perpendicular to themagnetic field.find the magnetic flux if the plane is normal to the fieldand the plane is 60o with the field

The change in focal length of an eye lens is caused by the action of the –

An electron beam has an aperture 1.00 mm2. A total of 6.0×1016 electrons go through any perpendicular cross-section per second. Find the current(i) and the current density(j) of the beam.

Those liquids which can change into vapours easily are termed as __

2. The circle described on any focal chord of a parabola as diameter touches the direction.prove it

An insect is sitting at a distance of 80cm in front of a plane mirror. If it moves 0.20m towards the mirror then what will be the distance of the insect from its image now​?

The manifestation of band structure in solids is due to

ntIn a fraunhofer diffraction at a single slit of width d with incident light of wavelength 5500 A,the first minimum is observed at angle of 30 degree. The first secondary maximum is observed at an angle theta, equal ton

Velocity of light in diamond is 125000km/s. Calculate its RI w.r.t to air.

20.At what rate should Earth rotate so that apparent g at the equator become 0? what will be length of the day in this situation

Radius of curvature of both surfaces of lens is 60 cm. Find the focal length of the silvered lens.

Question 19Groundwater will not be depleted due to(a) afforestation(b) thermal power plants(c) loss of forest and decreased rainfall(d) cropping of high water demanding crops

Why does light not escape black holes?

There are two charges +e and -4e placed at the separation of 1 metre so where should be the third charge +q be placed so that the net force on it is 0 ?

An object is seen through a glass slab of thickness 36 cm and refractive index 3/2. If the system of object, observer and the glass slab is dipped in the water(μ=4/3) keeping all the distances fixed, then the shift produced by the glass slab will be :

Why CFL is considered better than filament based electric bulbs?

Question 2 What is meant by saying that the potential difference between two points is 1 V?

InvestigateIn thegiven figure, the angle measures 30°.Look at the same figure through a magnifying glass. Does the anglebecome larger? Does the size of the angle change?

A coil of resistance 20 ohm and inductance 5 H has been connected to a 100 V battery. The energy stored in the coil is

If a nucleus AZX emits an α− particle and a β− particle, then the daughter nucleus will have the total number of neutrons as A−Z−n=y. The value of n is (integer only)

State the various factors on which the electrical resistance of a conductor depends. How does it depend on these factors?

Which of these can be considered as disadvantage of hydropower generation?

ntThere are two cases. In the first case a spring (spring constant k) is pulled by two equal and opposite forces F at both ends and in second case one end of spring is fixed to a rigid support and other end is pulled by a force F. Extensions (x) in the string will ben

Time period of thin bar magnet of vibration magnetometer is 'T'. If it cuts into two equal parts in then the time period of each part fashions. (a) Along or parallel to its length(b) Perpendicular to its length, (1)T, T(2)T, T/2(3)T/2, T(4)T/2, T/2

EMF is induced by change in magnetic flux so how can a rod moving with velocity v in a uniform magnetic field have potential difference across its ends?

Two metallic resistances R and 3R have their temperature coefficients of resistance a and 2a respectively. The effective temperature coefficient of their combination when they are connected in parallel will be 1) 3a 2) 4a/3 3) 4a/5 4) 5a/4

In Fleming’s right hand rule

With the help of a diagram, explain why the image of an object viewed through a concave lens appears smaller and closer than the object.

Suppose we have coloured a CD in seven colours of rainbow and spin it at very high speed then we see it's colour as white. Why?

Ficks principle?

Which of the following is correct for a 3-D hexagonal closed packing lattice ?Here Zeff=Total number of atoms in hcp latticeOv=Total number of octahedral voidsTv=Total number of tetrahedral voids

a particle of mass m is thrown upward from the surface of earth with a velocity u the mass and radius of earth are repectively M and R G is gravitational constant and g is accelaration due to gravity on the surface of earth the minimum value of u so that the particle does not return back to earth

(b) What is the percentage composition by volume of a mixture of carbon monoxide and methane, 15 ml of which required 10 ml of oxygen for complete combustion?

A man weighs 600N on the equator, but when he moves to the pole he finds a slight increase in his weight. This is because

Write the steps to measure the diameter of a thin wire using screw gauge.

Why q is used to define electric field without the region of field?

Find the current i in the circuit shown below.

An insect is sitting at a distance of 80cm in front of a plane mirror. If it moves 0.20m towards the mirror then what will be the distance of the insect from its image now?