16569 + Interview Questions in Physics

1.	Weight of a body decreases by 1.5%, when it is raised to a height h above the surface of earth. When thesame body is taken to same depth h in a mine, its weight will show(1) 0.75% increase(2) 3.0% decrease(3) 0.75% decrease(4) 1.5% decrease
Answer» Weight of a body decreases by 1.5%, when it is raised to a height h above the surface of earth. When thesame body is taken to same depth h in a mine, its weight will show(1) 0.75% increase(2) 3.0% decrease(3) 0.75% decrease(4) 1.5% decrease

Discussion

2.	The fuse wire has a ___ melting point.
Answer» The fuse wire has a ___ melting point.

Discussion

3.	Question 1What changes would you suggest in your home in order to be environment-friendly?
Answer» Question 1 What changes would you suggest in your home in order to be environment-friendly?

Discussion

4.	Prism angle of prism is 10°. Their refractive index for red and voilet colour is 1.51 and 1.52 respectively.Then despersive power will be?
Answer» Prism angle of prism is 10°. Their refractive index for red and voilet colour is 1.51 and 1.52 respectively.Then despersive power will be?

Discussion

5.	How to fond spring contant
Answer» How to fond spring contant

Discussion

6.	How to find the total resistance of an electric circuit if there is resistance R1 ,R2, R3, R4, R5 individualaly.
Answer» How to find the total resistance of an electric circuit if there is resistance R1 ,R2, R3, R4, R5 individualaly.

Discussion

7.	what is monochromatic light in triangular prism and minimum deviation?
Answer» what is monochromatic light in triangular prism and minimum deviation?

Discussion

8.	A compound microscope has an objective of focal length 2 cm and an eye piece of focal length 5 cm. An object is placed at a distance 2.4 cm in front of objective lens. If final image forms at infinity then magnifying power and corresponding tube length of microscope are respectively
Answer» A compound microscope has an objective of focal length 2 cm and an eye piece of focal length 5 cm. An object is placed at a distance 2.4 cm in front of objective lens. If final image forms at infinity then magnifying power and corresponding tube length of microscope are respectively

Discussion

9.	The magnification produced by a spherical mirror is -2. List four information you obtain from this statement about the mirror/image.
Answer» The magnification produced by a spherical mirror is -2. List four information you obtain from this statement about the mirror/image.

Discussion

10.	spring of force constant k is cut into lengths of ratio 1 : 2 : 3. They are connected in series and the new force constant is k. Then they are connected in parallel and force constant is k. Then k : k is (1) 1 : 6 (2) 1 : 9 (3) 1 : 11 (4) 1 : 14
Answer» spring of force constant k is cut into lengths of ratio 1 : 2 : 3. They are connected in series and the new force constant is k. Then they are connected in parallel and force constant is k. Then k : k is (1) 1 : 6 (2) 1 : 9 (3) 1 : 11 (4) 1 : 14

Discussion

11.	Two resistances of 100 Ω and 0 Ω are connected in parallel. The overall resistance will be:
Answer» Two resistances of 100 Ω and 0 Ω are connected in parallel. The overall resistance will be:

Discussion

12.	87Ra221 undergoes radioactive decay with a half life of 4 days. The probability that a Ra nucleus will disintegrate in 8 days is
Answer» $_{87} R a^{221}$ undergoes radioactive decay with a half life of $4 days$ . The probability that a $R a$ nucleus will disintegrate in $8 days$ is

Discussion

13.	I have a resistor marked with colours Red, Blue, Yellow and Gold from left to right. What is its resistance?
Answer» I have a resistor marked with colours Red, Blue, Yellow and Gold from left to right. What is its resistance?

Discussion

14.	Find the electrostatic potential on the surface of uniformly charged non conducting solid sphere w.r.t centre of the sphere
Answer» Find the electrostatic potential on the surface of uniformly charged non conducting solid sphere w.r.t centre of the sphere

Discussion

15.	A student has been given 3 resistances of 3 ohms each.(a) How should he connect these resistances so as to obtain a resultant resistance of 1 ohm?(b) Draw a labelled diagram to show the combination of these resistances.
Answer» A student has been given 3 resistances of 3 ohms each. (a) How should he connect these resistances so as to obtain a resultant resistance of 1 ohm? (b) Draw a labelled diagram to show the combination of these resistances.

Discussion

16.	Why the resistors setup in the parallel combination acquires same potential difference but different currents.
Answer» Why the resistors setup in the parallel combination acquires same potential difference but different currents.

Discussion

17.	An isolated conducting sphere of radius R maintained at potential Vis being rotated at constant angular velocity omega about one of its diameter.find magnetic dipole momentm(vector)of the sphere and magnetic induction B(vector) at its centre.
Answer» An isolated conducting sphere of radius R maintained at potential Vis being rotated at constant angular velocity omega about one of its diameter.find magnetic dipole momentm(vector)of the sphere and magnetic induction B(vector) at its centre.

Discussion

18.	Observe the optical systems above. Given that all surfaces are made of transparent glass and the dotted surfaces represent plane surface. Which among them can be considered as lenses?
Answer» Observe the optical systems above. Given that all surfaces are made of transparent glass and the dotted surfaces represent plane surface. Which among them can be considered as lenses?

18.

Observe the optical systems above. Given that all surfaces are made of transparent glass and the dotted surfaces represent plane surface. Which among them can be considered as lenses?

Answer»

Observe the optical systems above. Given that all surfaces are made of transparent glass and the dotted surfaces represent plane surface. Which among them can be considered as lenses?

Discussion

19.	To an astronaut, why does the sky appear dark instead of blue? [2 MARKS]
Answer» To an astronaut, why does the sky appear dark instead of blue? [2 MARKS]

Discussion

20.	What is a thermal power plant and how does it works
Answer» What is a thermal power plant and how does it works

Discussion

21.	The phenomenon of radioactivity was discovered in 1896 by _________.
Answer» The phenomenon of radioactivity was discovered in 1896 by _________.

Discussion

22.	What is meant by green energy? Which energy sources can be called as green energy sources and why? Give examples.
Answer» What is meant by green energy? Which energy sources can be called as green energy sources and why? Give examples.

Discussion

23.	a long solenoid has 1000 turns . when a current of 4 A flows through it the magnetic flux linked with each turn of the solenoid is 4*10^-3 Wb the self inductance of the solenoid [1]1H [2] 4H [2] 3H [4] 2H
Answer» a long solenoid has 1000 turns . when a current of 4 A flows through it the magnetic flux linked with each turn of the solenoid is 4*10^-3 Wb the self inductance of the solenoid [1]1H [2] 4H [2] 3H [4] 2H

Discussion

24.	Snakes are killed in large numbers because: (a) they are very poisonous (b) they kill rats (c) their skin is expensive (d) they damage the crops
Answer» Snakes are killed in large numbers because: (a) they are very poisonous (b) they kill rats (c) their skin is expensive (d) they damage the crops

Discussion

25.	{ Light having a free space wavelength of }λ_0=500nm passes from vacuum into diamond }}{(μ_d=2.4) . Find wave speed and wave length in the diamond. }} If speed of light in zive speed and wave length in the diamond.
Answer» { Light having a free space wavelength of }λ_0=500nm passes from vacuum into diamond }}{(μ_d=2.4) . Find wave speed and wave length in the diamond. }} If speed of light in zive speed and wave length in the diamond.

Discussion

26.	A particle of mass 1 kg has been thrown with initil speed 20 m/s making an angle 60 with the horizontal ground. The angular momentum of the particle about point of projection when the projectile is at the highest point is (g 10 m/s2)
Answer» A particle of mass 1 kg has been thrown with initil speed 20 m/s making an angle 60 with the horizontal ground. The angular momentum of the particle about point of projection when the projectile is at the highest point is (g 10 m/s2)

Discussion

27.	What is Right-Hand Rule? Explain it with diagram
Answer» What is Right-Hand Rule? Explain it with diagram

Discussion

28.	The ratio of the K.E. required to be given to the satellite to escape earth's gravitational field to the K.E. required to be given so that the satellite moves in a circular orbit just above earth atmosphere is ___ .
Answer» The ratio of the K.E. required to be given to the satellite to escape earth's gravitational field to the K.E. required to be given so that the satellite moves in a circular orbit just above earth atmosphere is ___ .

Discussion

29.	A semiconductor is known to have an electron concentration of 8×1013/cc and hole concentration of 5×1012/cc . The semiconductor is
Answer» A semiconductor is known to have an electron concentration of $8 \times 10^{13} / c c$ and hole concentration of $5 \times 10^{12} / c c$ . The semiconductor is

Discussion

30.	A small angled prism of angel 3∘ is made of material having refractive index μ=1.5. A ray of light is incident as shown in the figure. M is a plane mirror. Find the angle of deviation for the ray reflected from the mirror M w.r.t. the incident ray.
Answer» A small angled prism of angel $3^{\circ}$ is made of material having refractive index $μ = 1.5$ . A ray of light is incident as shown in the figure. $M$ is a plane mirror. Find the angle of deviation for the ray reflected from the mirror $M$ w.r.t. the incident ray.

Discussion

31.	9. An electron and proton having equal momentum enter in a uniform magnetic field normal to the field lines.if the radii of their circular paths be re and rp resp. Then find re:rp
Answer» 9. An electron and proton having equal momentum enter in a uniform magnetic field normal to the field lines.if the radii of their circular paths be re and rp resp. Then find re:rp

Discussion

32.	A stationary Thorium nucleus (A=220,Z=90) emits an alpha particle with kinetic energy Eα. What is the kinetic energy of the recoiling nucleus?
Answer» A stationary Thorium nucleus $(A = 220, Z = 90)$ emits an alpha particle with kinetic energy $E_{α}$ . What is the kinetic energy of the recoiling nucleus?

Discussion

33.	A ray of light is incident on a glass sphere of refractive index 3/2. What should be the angle of incidence in degrees so that the ray that enters the sphere does not come out of the sphere?
Answer» A ray of light is incident on a glass sphere of refractive index 3/2. What should be the angle of incidence in degrees so that the ray that enters the sphere does not come out of the sphere?

Discussion

34.	Students A and B connect the two resistors R1 and R2 given to them in the manners shown below:and then insert them at X and Y into the measuring circuit shown below:We can then say that(1) both the students will determine the equivalent resistance of the series combination of R1 and R2 (2) both the students will determine the equivalent resistance of the parallel combination of R1 and R2 (3) student A will determine the equivalent resistance of the series combination while student B will determine the equivalent resistance of the parallel combination of R1 and R2 (4) student A will determine the equivalent resistance of the parallel combination while student B will determine the equivalent resistance of the series combination of R1 and R2
Answer» Students A and B connect the two resistors R₁ and R₂ given to them in the manners shown below: and then insert them at X and Y into the measuring circuit shown below: We can then say that (1) both the students will determine the equivalent resistance of the series combination of R₁ and R₂ (2) both the students will determine the equivalent resistance of the parallel combination of R₁ and R₂ (3) student A will determine the equivalent resistance of the series combination while student B will determine the equivalent resistance of the parallel combination of R₁ and R₂ (4) student A will determine the equivalent resistance of the parallel combination while student B will determine the equivalent resistance of the series combination of R₁ and R₂

Discussion

35.	Why are the conductors of electric heating devices, such as toasters and electric irons, made of an alloy rather than a pure metal?
Answer» Why are the conductors of electric heating devices, such as toasters and electric irons, made of an alloy rather than a pure metal?

Discussion

36.	38. Two different coils have self inductance L1=8mH and L2=2mH.The current in both coil is increased at same constant rate. At certain instant power given to two coils is same. At the time energy stored in both the coils Are V1 and V2 respectively then V1/V2 is
Answer» 38. Two different coils have self inductance L1=8mH and L2=2mH.The current in both coil is increased at same constant rate. At certain instant power given to two coils is same. At the time energy stored in both the coils Are V1 and V2 respectively then V1/V2 is

Discussion

37.	As we know Earth is huge magnet... and it has magnetic field around it...we know that when the change in magnetic linkage occurs electricity is produced in the matter... so if we consider earth a magnet and atmosphere around it as matter then why don't electricity is produced??? ((Atmosphere is always in motion))
Answer» As we know Earth is huge magnet... and it has magnetic field around it...we know that when the change in magnetic linkage occurs electricity is produced in the matter... so if we consider earth a magnet and atmosphere around it as matter then why don't electricity is produced??? ((Atmosphere is always in motion))

Discussion

38.	If a light ray incident normally on one of the faces of a Prism of refractive index 2 and the emergent ray just graces the second face of the prism, then the angle of deviation is?
Answer» If a light ray incident normally on one of the faces of a Prism of refractive index 2 and the emergent ray just graces the second face of the prism, then the angle of deviation is?

Discussion

39.	In a uniform circular motion, acceleration of the object is 80 m/s2 and the radius is 5 m. Find out the angular speed of the object.
Answer» In a uniform circular motion, acceleration of the object is $80 m / s^{2}$ and the radius is 5 m. Find out the angular speed of the object.

Discussion

40.	The strength of magnetic field inside a long current carrying solenoid is :
Answer» The strength of magnetic field inside a long current carrying solenoid is :

Discussion

41.	(a) Explain why a real image can be projected on a screen but a virtual image cannot. (b) Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of the object and image with respect to the principal focus should be shown clearly. (c) Name one simple optical instrument in which the above arrangement of the convex lens is used.
Answer» (a) Explain why a real image can be projected on a screen but a virtual image cannot. (b) Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of the object and image with respect to the principal focus should be shown clearly. (c) Name one simple optical instrument in which the above arrangement of the convex lens is used.

41.

(a) Explain why a real image can be projected on a screen but a virtual image cannot. (b) Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of the object and image with respect to the principal focus should be shown clearly. (c) Name one simple optical instrument in which the above arrangement of the convex lens is used.

Answer»

(a) Explain why a real image can be projected on a screen but a virtual image cannot.

(b) Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of the object and image with respect to the principal focus should be shown clearly.

(c) Name one simple optical instrument in which the above arrangement of the convex lens is used.

Discussion

42.	The difference between the angular momentum of two orbits of He+2 is 2h/π.The energy of an electron present in the higher orbits is -1.51eV. Identify the lowest orbital.
Answer» The difference between the angular momentum of two orbits of He+2 is 2h/π. The energy of an electron present in the higher orbits is -1.51eV. Identify the lowest orbital.

Discussion

43.	Why do children always slide down the slide and not slide up? If this slide were there in Sunita’s spacecraft, would children slide like this? Why?
Answer» Why do children always slide down the slide and not slide up? If this slide were there in Sunita’s spacecraft, would children slide like this? Why?

Discussion

44.	Which one of the following cases is body more stable?
Answer» Which one of the following cases is body more stable?

Discussion

45.	To study the dependence of potential difference (V) on current I across Resistor (R), four circuit diagrams are prepared. (i) Select the circuit diagrams which are correct. (ii) Give reason for the circuit diagrams which are not correct.
Answer» To study the dependence of potential difference (V) on current I across Resistor (R), four circuit diagrams are prepared. (i) Select the circuit diagrams which are correct. (ii) Give reason for the circuit diagrams which are not correct.

Discussion

46.	2.the sides of rectangular block are 2cm,3cm,4cm, find the ratio of maximum to minimum resistance between its parallel faces 4:1 3:1 2:1 1:1
Answer» 2.the sides of rectangular block are 2cm,3cm,4cm, find the ratio of maximum to minimum resistance between its parallel faces 4:1 3:1 2:1 1:1

Discussion

47.	Which one is an example of gel
Answer» Which one is an example of gel

Discussion

48.	State and explain the New Cartesian Sign Convention for spherical lenses.
Answer» State and explain the New Cartesian Sign Convention for spherical lenses.

Discussion

49.	Find the value of current from battery in the circuit.
Answer» Find the value of current from battery in the circuit.

Discussion

50.	If a charge of an electron is 1.6×10-19 coloumb , how many electrons should pass through a conductor in 1second to constitute 1 ampere current?
Answer» If a charge of an electron is 1.6×10^-19 coloumb , how many electrons should pass through a conductor in 1second to constitute 1 ampere current?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Weight of a body decreases by 1.5%, when it is raised to a height h above the surface of earth. When thesame body is taken to same depth h in a mine, its weight will show(1) 0.75% increase(2) 3.0% decrease(3) 0.75% decrease(4) 1.5% decrease

The fuse wire has a ___ melting point.

Question 1What changes would you suggest in your home in order to be environment-friendly?

Prism angle of prism is 10°. Their refractive index for red and voilet colour is 1.51 and 1.52 respectively.Then despersive power will be?

How to fond spring contant

How to find the total resistance of an electric circuit if there is resistance R1 ,R2, R3, R4, R5 individualaly.

what is monochromatic light in triangular prism and minimum deviation?

A compound microscope has an objective of focal length 2 cm and an eye piece of focal length 5 cm. An object is placed at a distance 2.4 cm in front of objective lens. If final image forms at infinity then magnifying power and corresponding tube length of microscope are respectively

The magnification produced by a spherical mirror is -2. List four information you obtain from this statement about the mirror/image.

spring of force constant k is cut into lengths of ratio 1 : 2 : 3. They are connected in series and the new force constant is k. Then they are connected in parallel and force constant is k. Then k : k is (1) 1 : 6 (2) 1 : 9 (3) 1 : 11 (4) 1 : 14

Two resistances of 100 Ω and 0 Ω are connected in parallel. The overall resistance will be:

87Ra221 undergoes radioactive decay with a half life of 4 days. The probability that a Ra nucleus will disintegrate in 8 days is

I have a resistor marked with colours Red, Blue, Yellow and Gold from left to right. What is its resistance?

Find the electrostatic potential on the surface of uniformly charged non conducting solid sphere w.r.t centre of the sphere

A student has been given 3 resistances of 3 ohms each.(a) How should he connect these resistances so as to obtain a resultant resistance of 1 ohm?(b) Draw a labelled diagram to show the combination of these resistances.

Why the resistors setup in the parallel combination acquires same potential difference but different currents.

An isolated conducting sphere of radius R maintained at potential Vis being rotated at constant angular velocity omega about one of its diameter.find magnetic dipole momentm(vector)of the sphere and magnetic induction B(vector) at its centre.

Observe the optical systems above. Given that all surfaces are made of transparent glass and the dotted surfaces represent plane surface. Which among them can be considered as lenses?

To an astronaut, why does the sky appear dark instead of blue? [2 MARKS]

What is a thermal power plant and how does it works

The phenomenon of radioactivity was discovered in 1896 by _________.

What is meant by green energy? Which energy sources can be called as green energy sources and why? Give examples.

a long solenoid has 1000 turns . when a current of 4 A flows through it the magnetic flux linked with each turn of the solenoid is 4*10^-3 Wb the self inductance of the solenoid [1]1H [2] 4H [2] 3H [4] 2H

Snakes are killed in large numbers because: (a) they are very poisonous (b) they kill rats (c) their skin is expensive (d) they damage the crops

{ Light having a free space wavelength of }λ_0=500nm passes from vacuum into diamond }}{(μ_d=2.4) . Find wave speed and wave length in the diamond. }} If speed of light in zive speed and wave length in the diamond.

A particle of mass 1 kg has been thrown with initil speed 20 m/s making an angle 60 with the horizontal ground. The angular momentum of the particle about point of projection when the projectile is at the highest point is (g 10 m/s2)

What is Right-Hand Rule? Explain it with diagram

The ratio of the K.E. required to be given to the satellite to escape earth's gravitational field to the K.E. required to be given so that the satellite moves in a circular orbit just above earth atmosphere is ___ .

A semiconductor is known to have an electron concentration of 8×1013/cc and hole concentration of 5×1012/cc . The semiconductor is

A small angled prism of angel 3∘ is made of material having refractive index μ=1.5. A ray of light is incident as shown in the figure. M is a plane mirror. Find the angle of deviation for the ray reflected from the mirror M w.r.t. the incident ray.

9. An electron and proton having equal momentum enter in a uniform magnetic field normal to the field lines.if the radii of their circular paths be re and rp resp. Then find re:rp

A stationary Thorium nucleus (A=220,Z=90) emits an alpha particle with kinetic energy Eα. What is the kinetic energy of the recoiling nucleus?

A ray of light is incident on a glass sphere of refractive index 3/2. What should be the angle of incidence in degrees so that the ray that enters the sphere does not come out of the sphere?

Why are the conductors of electric heating devices, such as toasters and electric irons, made of an alloy rather than a pure metal?

38. Two different coils have self inductance L1=8mH and L2=2mH.The current in both coil is increased at same constant rate. At certain instant power given to two coils is same. At the time energy stored in both the coils Are V1 and V2 respectively then V1/V2 is

If a light ray incident normally on one of the faces of a Prism of refractive index 2 and the emergent ray just graces the second face of the prism, then the angle of deviation is?

In a uniform circular motion, acceleration of the object is 80 m/s2 and the radius is 5 m. Find out the angular speed of the object.

The strength of magnetic field inside a long current carrying solenoid is :

The difference between the angular momentum of two orbits of He+2 is 2h/π.The energy of an electron present in the higher orbits is -1.51eV. Identify the lowest orbital.

Why do children always slide down the slide and not slide up? If this slide were there in Sunita’s spacecraft, would children slide like this? Why?

Which one of the following cases is body more stable?

To study the dependence of potential difference (V) on current I across Resistor (R), four circuit diagrams are prepared. (i) Select the circuit diagrams which are correct. (ii) Give reason for the circuit diagrams which are not correct.

2.the sides of rectangular block are 2cm,3cm,4cm, find the ratio of maximum to minimum resistance between its parallel faces 4:1 3:1 2:1 1:1

Which one is an example of gel

State and explain the New Cartesian Sign Convention for spherical lenses.

Find the value of current from battery in the circuit.

If a charge of an electron is 1.6×10-19 coloumb , how many electrons should pass through a conductor in 1second to constitute 1 ampere current?