16569 + Interview Questions in Physics

1.	If you put a pencil on one pan of the weighing balance and a geometry box on the other pan. Which side will go down and why?
Answer» If you put a pencil on one pan of the weighing balance and a geometry box on the other pan. Which side will go down and why?

Discussion

2.	Two coils connected in series have a self-inductance of 50 mH and 60 mH respectively. The total inductance of the combination was found to be 100 mH. Determine the amount of mutual inductance that exists between the two coils, assuming that they are opposing each other.
Answer» Two coils connected in series have a self-inductance of $50 mH$ and $60 mH$ respectively. The total inductance of the combination was found to be $100 mH$ . Determine the amount of mutual inductance that exists between the two coils, assuming that they are opposing each other.

Discussion

3.	Calorific value and ignition temperature of fuel X are 75 kj/g and 20∘C respectively. These values for fuel Y are 50 kj/g and 75∘C respectively. On burning, the fuel Y produces only CO2 while fuel X produces CO2 and CO. Which of the two is a better fuel? Give two reasons to support your answer.
Answer» Calorific value and ignition temperature of fuel X are 75 kj/g and $20^{\circ} C$ respectively. These values for fuel Y are 50 kj/g and $75^{\circ} C$ respectively. On burning, the fuel Y produces only $C O_{2}$ while fuel X produces $C O_{2}$ and CO. Which of the two is a better fuel? Give two reasons to support your answer.

Discussion

4.	A person is able to clearly see an object placed at 60 cm from his eye. The focal length of the eye lens in this scenario is 2 cm. What is the distance of the eye-lens from the retina?
Answer» A person is able to clearly see an object placed at $60 cm$ from his eye. The focal length of the eye lens in this scenario is $2 cm$ . What is the distance of the eye-lens from the retina?

Discussion

5.	two thin lenses of focal length +20cm and -5cm are kept in contact what is the focal length and power of combination?
Answer» two thin lenses of focal length +20cm and -5cm are kept in contact what is the focal length and power of combination?

Discussion

6.	If the radius of earth shrinks by 1.5% (mass remaining same), then the value of gravitational accelaration changes by
Answer» If the radius of earth shrinks by $1.5 %$ (mass remaining same), then the value of gravitational accelaration changes by

Discussion

7.	An object is 100mm in front of a concave mirror which produces an upright image. The radius of the curvature of the mirror is A)less than 100mm B)between 100mm and 200mm C)exact 200mm D)more than 200mm
Answer» An object is 100mm in front of a concave mirror which produces an upright image. The radius of the curvature of the mirror is A)less than 100mm B)between 100mm and 200mm C)exact 200mm D)more than 200mm

Discussion

8.	The nature of positive ray depends upon
Answer» The nature of positive ray depends upon

Discussion

9.	You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Answer» You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.

Discussion

10.	A body of mass 2 kg s projected vertically upwith velocity of 20 m/s. If the energy spent in overcoming air resistance is 100 J, the maximumheight attained by it is (g 10 m/s2)(1) 15 m(2) 20 m(4) 25 m3) 10 m
Answer» A body of mass 2 kg s projected vertically upwith velocity of 20 m/s. If the energy spent in overcoming air resistance is 100 J, the maximumheight attained by it is (g 10 m/s2)(1) 15 m(2) 20 m(4) 25 m3) 10 m

Discussion

11.	A telescope made of mirrors is used to observe the moon. It forms the inverted image of the moon at 3.5 km from the eye piece. Find the diameter of the image of the moon. Given the diameter of the moon is 1700 km and the distance of the moon from the earth is 350,000 km.
Answer» A telescope made of mirrors is used to observe the moon. It forms the inverted image of the moon at 3.5 km from the eye piece. Find the diameter of the image of the moon. Given the diameter of the moon is 1700 km and the distance of the moon from the earth is 350,000 km.

Discussion

12.	Define the term fuel along with examples.
Answer» Define the term fuel along with examples.

Discussion

13.	A student has to project a 3 times magnified image of the candle flame on a wall.name the type of lens required for this purpose.If the candle flame is at a distance of 6m from the wall,find the focal length of the lens.
Answer» A student has to project a 3 times magnified image of the candle flame on a wall.name the type of lens required for this purpose.If the candle flame is at a distance of 6m from the wall,find the focal length of the lens.

Discussion

14.	Why is potential energy w/q when it's actually the pressure difference of electrons of two points
Answer» Why is potential energy w/q when it's actually the pressure difference of electrons of two points

Discussion

15.	86.A sphere of mass m is held between two inclined walls. for sin 37deg =3/5 the normal reaction of the wall (2) is ?
Answer» 86.A sphere of mass m is held between two inclined walls. for sin 37deg =3/5 the normal reaction of the wall (2) is ?

Discussion

16.	The same size images are formed by a convex lens when the object is placed at 20 cm or at 10 cm from the lens. The focal length of the convex lens is _________cm.
Answer» The same size images are formed by a convex lens when the object is placed at $20 cm$ or at $10 cm$ from the lens. The focal length of the convex lens is _________ $cm$ .

Discussion

17.	an incident wave and a reflected wave are represented byY1=asin2π/λ(vt-x) and Y2=asin2π/λ(vt+x).Derive the expression of the stationary wave and calculate the position of nodes and antinodes.
Answer» an incident wave and a reflected wave are represented by Y1=asin2π/λ(vt-x) and Y2=asin2π/λ(vt+x). Derive the expression of the stationary wave and calculate the position of nodes and antinodes.

Discussion

18.	A particle is projected with v0 at angle of 30ºwith vertical. Its average velocity for its timeof flight is (1) v0 sin 30º (2) v0 cos 30º (3) v0 tan 30º (4) None of the above
Answer» A particle is projected with v0 at angle of 30º with vertical. Its average velocity for its time of flight is (1) v0 sin 30º (2) v0 cos 30º (3) v0 tan 30º (4) None of the above

Discussion

19.	We know that we require a mirror of atleast half the size of our body to see our complete body in the mirror. So, is this property of mirror independent of the distance between the body and the mirror?
Answer» We know that we require a mirror of atleast half the size of our body to see our complete body in the mirror. So, is this property of mirror independent of the distance between the body and the mirror?

Discussion

20.	A rectangular polygon of n sides is formed by bending the wire of total length 2pieR which carries a current L. Find the magnetic field at the centre of the polygon?
Answer» A rectangular polygon of n sides is formed by bending the wire of total length 2pieR which carries a current L. Find the magnetic field at the centre of the polygon?

Discussion

21.	When 60 calories of heat is supplied to 15g of water, the rise in temperature is
Answer» When 60 calories of heat is supplied to 15g of water, the rise in temperature is

Discussion

22.	One calorie is the heat energy required to raise the temperature of one gram of water by ___ degree Celsius at a pressure of one atmosphere.
Answer» One calorie is the heat energy required to raise the temperature of one gram of water by ___ degree Celsius at a pressure of one atmosphere.

Discussion

23.	an achromatic doublet of focal length 90 cm is to be made of two lens. The material of one of the lenses has 1.5 times the dispersive power of the other. The doublet is converging type. Find the focal length of each lens- (1) f1 = 20 cm and f2 = 30 cm (2) f1 = -20 cm and f2 = -45 cm (3) f1 = 30 cm and f2 = -45 cm (4) f1 = 15 cm and f2 = -20 cm
Answer» an achromatic doublet of focal length 90 cm is to be made of two lens. The material of one of the lenses has 1.5 times the dispersive power of the other. The doublet is converging type. Find the focal length of each lens- (1) f1 = 20 cm and f2 = 30 cm (2) f1 = -20 cm and f2 = -45 cm (3) f1 = 30 cm and f2 = -45 cm (4) f1 = 15 cm and f2 = -20 cm

Discussion

24.	A student traces the path of a ray of light passing through a rectangular glass slab for three different values of angle of incidence (∠i) namely 30°, 45° and 60°. He extends the direction of incident ray by a dotted line and measures the perpendicular distance 'l' between the extended incident ray and the emergent ray. He will observe that:(1) 'l' keeps on increasing with increase in angle of incidence(2) 'l' keeps on decreasing with increase in angle of incidence(3) 'l' remains the same for all three angles of incidence.(4) 'l' is the maximum for ∠i = 45° and is less than this value both for ∠i = 30° and ∠i = 60°
Answer» A student traces the path of a ray of light passing through a rectangular glass slab for three different values of angle of incidence (∠i) namely 30°, 45° and 60°. He extends the direction of incident ray by a dotted line and measures the perpendicular distance 'l' between the extended incident ray and the emergent ray. He will observe that: (1) 'l' keeps on increasing with increase in angle of incidence (2) 'l' keeps on decreasing with increase in angle of incidence (3) 'l' remains the same for all three angles of incidence. (4) 'l' is the maximum for ∠i = 45° and is less than this value both for ∠i = 30° and ∠i = 60°

Discussion

25.	In a nuclear power plant, coolant is a substance : (a) which cools the hot, spent steam to condense it back to water (b) which transfers heat from reactor to water in heat exchanger (c) which is boiled to make steam to turn the turbine (d) which cools the generator coils to prevent their overheating.
Answer» In a nuclear power plant, coolant is a substance : (a) which cools the hot, spent steam to condense it back to water (b) which transfers heat from reactor to water in heat exchanger (c) which is boiled to make steam to turn the turbine (d) which cools the generator coils to prevent their overheating.

Discussion

26.	Elementary charge
Answer» Elementary charge

Discussion

27.	What is the current flowing through a conductor when a charge of 60 C flows for 1 minute?
Answer» What is the current flowing through a conductor when a charge of $60 C$ flows for $1 m i n u t e$ ?

Discussion

28.	Mass become double and time becomes half ,then 8 joule will be
Answer» Mass become double and time becomes half ,then 8 joule will be

Discussion

29.	What is refracted ray?
Answer» What is refracted ray?

Discussion

30.	a proton and electron and Alpha particle are being accelerated by the same potential difference and developed into a uniform magnetic field the climatic energy of the particle value come out of the field will be in the ratio
Answer» a proton and electron and Alpha particle are being accelerated by the same potential difference and developed into a uniform magnetic field the climatic energy of the particle value come out of the field will be in the ratio

Discussion

31.	2For an EMWave,E E, sin 12 x 10^° IZ -2 x 10t\rbrack in a medium, then its refractive index is(2) 3/2(3) 4/3(4) 5/3
Answer» 2For an EMWave,E E, sin 12 x 10^° IZ -2 x 10t\rbrack in a medium, then its refractive index is(2) 3/2(3) 4/3(4) 5/3

Discussion

32.	Choose the correct option/options:
Answer» Choose the correct option/options:

Discussion

33.	Why is the absorption spectrum always discontinuous?
Answer» Why is the absorption spectrum always discontinuous?

Discussion

34.	Two resistors with nominal resistance values R1 R2 have additive uncertainties ΔR1 and ΔR2 respectively. When these resistances are connected in parallel, the standard deviatioin of the error in the equivalent resistance R is
Answer» Two resistors with nominal resistance values $R_{1}$ $R_{2}$ have additive uncertainties $Δ R_{1}$ and $Δ R_{2}$ respectively. When these resistances are connected in parallel, the standard deviatioin of the error in the equivalent resistance $R$ is

Discussion

35.	State one use of nuclear fission reactions.
Answer» State one use of nuclear fission reactions.

Discussion

36.	The momentum of a particle having a de-Broglie wavelength of 0.1 ˚A is (approximately),
Answer» The momentum of a particle having a de-Broglie wavelength of $0.1 ˚ A$ is (approximately),

Discussion

37.	What is the working principle of electric motor
Answer» What is the working principle of electric motor

Discussion

38.	energy of electron in orbit of H atom is -1.51eV. Wavelength produced by the electron in same orbit if 1st orbit of H have radius x i
Answer» energy of electron in orbit of H atom is -1.51eV. Wavelength produced by the electron in same orbit if 1st orbit of H have radius x i

Discussion

39.	Arsenic and many of its compounds are especially potent poisons. In which of the following products is arsenic mainly found and released as an e-waste: Code:
Answer» Arsenic and many of its compounds are especially potent poisons. In which of the following products is arsenic mainly found and released as an e-waste: Code:

39.

Arsenic and many of its compounds are especially potent poisons. In which of the following products is arsenic mainly found and released as an e-waste: Code:

Answer»

Arsenic and many of its compounds are especially potent poisons. In which of the following products is arsenic mainly found and released as an e-waste:

Code:

Discussion

40.	In a satellite if the time of revolution is T, then its kinetic energy is proportional to
Answer» In a satellite if the time of revolution is T, then its kinetic energy is proportional to

Discussion

41.	Describe how you will locate a current carrying wire in a concealed wall?[3 marks]
Answer» Describe how you will locate a current carrying wire in a concealed wall?[3 marks]

Discussion

42.	what is coordination number of fcc
Answer» what is coordination number of fcc

Discussion

43.	When an object is placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror. Calculate the focal length of the mirror.
Answer» When an object is placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror. Calculate the focal length of the mirror.

Discussion

44.	Figure A and B shown two long straight wires of circular cross-section (a and b with a<b). carryingcurrent Iwhich is uniformly distributed across the cross-section. The magnitude of magnetic field B varies with radius r ad can be represented as:
Answer» Figure $A$ and $B$ shown two long straight wires of circular cross-section (a and b with a<b). carryingcurrent $I$ which is uniformly distributed across the cross-section. The magnitude of magnetic field $B$ varies with radius $r$ ad can be represented as:

Discussion

45.	How do you determine the size of nanoparticles?
Answer» How do you determine the size of nanoparticles?

Discussion

46.	Question 11 (i)Show how you would connect three resistors, each of resistance 6Ω, so that the combination has a resistance of(i) 9Ω?
Answer» Question 11 (i) Show how you would connect three resistors, each of resistance $6 Ω$ , so that the combination has a resistance of $(i) 9 Ω$ ?

Discussion

47.	Given that vapour pressure of water vapour at 29∘C is 30 torr and relative humidity is 0.9. Calculate the partial pressure of water vapour at the same temperature
Answer» Given that vapour pressure of water vapour at $29^{\circ} C$ is $30 t o r r$ and relative humidity is 0.9. Calculate the partial pressure of water vapour at the same temperature

Discussion

48.	Tax exemptions and subsidies are required to______________________
Answer» Tax exemptions and subsidies are required to______________________

Discussion

49.	Two cars A and B approaches a stationary observer from opposite sides with speed 15 m/s and 30 m/s respectively. Observer hears no beats. If the frequency of the horn of the car B is 504 Hz, then the frequency of the horn of the car A will be[Take speed of sound =330 m/s]
Answer» Two cars $A$ and $B$ approaches a stationary observer from opposite sides with speed $15 m/s$ and $30 m/s$ respectively. Observer hears no beats. If the frequency of the horn of the car $B$ is $504 Hz$ , then the frequency of the horn of the car $A$ will be $[$ Take speed of sound $= 330 m/s]$

Discussion

50.	While performing an experiment on verifying the laws of reflection of sound, the 'reflected sound' can be detected better by keeping one ear :(1) near the end of the tube and keeping the other ear closed(2) near the end of the tube and keeping the other ear open(3) at about 5 cm from the end of the tube and keeping the other ear closed(4) at about 5 cm from the end of the tube and keeping the other ear open
Answer» While performing an experiment on verifying the laws of reflection of sound, the 'reflected sound' can be detected better by keeping one ear : (1) near the end of the tube and keeping the other ear closed (2) near the end of the tube and keeping the other ear open (3) at about 5 cm from the end of the tube and keeping the other ear closed (4) at about 5 cm from the end of the tube and keeping the other ear open

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If you put a pencil on one pan of the weighing balance and a geometry box on the other pan. Which side will go down and why?

Two coils connected in series have a self-inductance of 50 mH and 60 mH respectively. The total inductance of the combination was found to be 100 mH. Determine the amount of mutual inductance that exists between the two coils, assuming that they are opposing each other.

Calorific value and ignition temperature of fuel X are 75 kj/g and 20∘C respectively. These values for fuel Y are 50 kj/g and 75∘C respectively. On burning, the fuel Y produces only CO2 while fuel X produces CO2 and CO. Which of the two is a better fuel? Give two reasons to support your answer.

A person is able to clearly see an object placed at 60 cm from his eye. The focal length of the eye lens in this scenario is 2 cm. What is the distance of the eye-lens from the retina?

two thin lenses of focal length +20cm and -5cm are kept in contact what is the focal length and power of combination?

If the radius of earth shrinks by 1.5% (mass remaining same), then the value of gravitational accelaration changes by

An object is 100mm in front of a concave mirror which produces an upright image. The radius of the curvature of the mirror is ​A)less than 100mm B)between 100mm and 200mm C)exact 200mm D)more than 200mm

The nature of positive ray depends upon

You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.

A body of mass 2 kg s projected vertically upwith velocity of 20 m/s. If the energy spent in overcoming air resistance is 100 J, the maximumheight attained by it is (g 10 m/s2)(1) 15 m(2) 20 m(4) 25 m3) 10 m

A telescope made of mirrors is used to observe the moon. It forms the inverted image of the moon at 3.5 km from the eye piece. Find the diameter of the image of the moon. Given the diameter of the moon is 1700 km and the distance of the moon from the earth is 350,000 km.

Define the term fuel along with examples.

A student has to project a 3 times magnified image of the candle flame on a wall.name the type of lens required for this purpose.If the candle flame is at a distance of 6m from the wall,find the focal length of the lens.

Why is potential energy w/q when it's actually the pressure difference of electrons of two points

86.A sphere of mass m is held between two inclined walls. for sin 37deg =3/5 the normal reaction of the wall (2) is ?

The same size images are formed by a convex lens when the object is placed at 20 cm or at 10 cm from the lens. The focal length of the convex lens is _________cm.

an incident wave and a reflected wave are represented byY1=asin2π/λ(vt-x) and Y2=asin2π/λ(vt+x).Derive the expression of the stationary wave and calculate the position of nodes and antinodes.

A particle is projected with v0 at angle of 30ºwith vertical. Its average velocity for its timeof flight is (1) v0 sin 30º (2) v0 cos 30º (3) v0 tan 30º (4) None of the above

We know that we require a mirror of atleast half the size of our body to see our complete body in the mirror. So, is this property of mirror independent of the distance between the body and the mirror?

A rectangular polygon of n sides is formed by bending the wire of total length 2pieR which carries a current L. Find the magnetic field at the centre of the polygon?

When 60 calories of heat is supplied to 15g of water, the rise in temperature is

One calorie is the heat energy required to raise the temperature of one gram of water by ___ degree Celsius at a pressure of one atmosphere.

Elementary charge

What is the current flowing through a conductor when a charge of 60 C flows for 1 minute?

Mass become double and time becomes half ,then 8 joule will be

What is refracted ray?

a proton and electron and Alpha particle are being accelerated by the same potential difference and developed into a uniform magnetic field the climatic energy of the particle value come out of the field will be in the ratio

2For an EMWave,E E, sin 12 x 10^° IZ -2 x 10t\rbrack in a medium, then its refractive index is(2) 3/2(3) 4/3(4) 5/3

Choose the correct option/options:

Why is the absorption spectrum always discontinuous?

Two resistors with nominal resistance values R1 R2 have additive uncertainties ΔR1 and ΔR2 respectively. When these resistances are connected in parallel, the standard deviatioin of the error in the equivalent resistance R is

State one use of nuclear fission reactions.

The momentum of a particle having a de-Broglie wavelength of 0.1 ˚A is (approximately),

What is the working principle of electric motor

energy of electron in orbit of H atom is -1.51eV. Wavelength produced by the electron in same orbit if 1st orbit of H have radius x i

Arsenic and many of its compounds are especially potent poisons. In which of the following products is arsenic mainly found and released as an e-waste: Code:

In a satellite if the time of revolution is T, then its kinetic energy is proportional to

Describe how you will locate a current carrying wire in a concealed wall?[3 marks]

what is coordination number of fcc

When an object is placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror. Calculate the focal length of the mirror.

Figure A and B shown two long straight wires of circular cross-section (a and b with a&lt;b). carryingcurrent Iwhich is uniformly distributed across the cross-section. The magnitude of magnetic field B varies with radius r ad can be represented as:

How do you determine the size of nanoparticles?

Question 11 (i)Show how you would connect three resistors, each of resistance 6Ω, so that the combination has a resistance of(i) 9Ω?

Given that vapour pressure of water vapour at 29∘C is 30 torr and relative humidity is 0.9. Calculate the partial pressure of water vapour at the same temperature

Tax exemptions and subsidies are required to______________________

Two cars A and B approaches a stationary observer from opposite sides with speed 15 m/s and 30 m/s respectively. Observer hears no beats. If the frequency of the horn of the car B is 504 Hz, then the frequency of the horn of the car A will be[Take speed of sound =330 m/s]

An object is 100mm in front of a concave mirror which produces an upright image. The radius of the curvature of the mirror is A)less than 100mm B)between 100mm and 200mm C)exact 200mm D)more than 200mm

Figure A and B shown two long straight wires of circular cross-section (a and b with a<b). carryingcurrent Iwhich is uniformly distributed across the cross-section. The magnitude of magnetic field B varies with radius r ad can be represented as: