16569 + Interview Questions in Physics

1.	Is weak nuclear force independent of charge
Answer» Is weak nuclear force independent of charge

Discussion

2.	5.A current of 5 ampere flows along a thin wire shaped as shown in the figure the radius of the curved part of the wire is equal to one 20 mm and the angle 2x =90^° . find the magnetic induction of the field at point O
Answer» 5.A current of 5 ampere flows along a thin wire shaped as shown in the figure the radius of the curved part of the wire is equal to one 20 mm and the angle 2x =90^° . find the magnetic induction of the field at point O

Discussion

3.	Two convex lenses A and B of the same aperture have thickness 1 cm and 1.5 cm respectively. Which will have a greater focal length?
Answer» Two convex lenses A and B of the same aperture have thickness 1 cm and 1.5 cm respectively. Which will have a greater focal length?

Discussion

4.	138. A charged particle, having charge q accelerated through a potential difference V enters a perpendicular magnetic field in which it experiences a force F. If V is increased to 5 V, the particle will experience a force 1) F 2) 5F 3) F/5 4) 5 F
Answer» 138. A charged particle, having charge q accelerated through a potential difference V enters a perpendicular magnetic field in which it experiences a force F. If V is increased to 5 V, the particle will experience a force 1) F 2) 5F 3) F/5 4) 5 F

Discussion

5.	A disc is placed on the surface of a pond filled with liquid of refractive index 53. A source of light is placed 4 m below the surface of the liquid. The minimum area of the disc so that light does not come out of the liquid into air is about
Answer» A disc is placed on the surface of a pond filled with liquid of refractive index $\frac{5}{3}$ . A source of light is placed 4 m below the surface of the liquid. The minimum area of the disc so that light does not come out of the liquid into air is about

Discussion

6.	87.Work done to rotate a current carrying square loop placed infront of long current carrying square
Answer» 87.Work done to rotate a current carrying square loop placed infront of long current carrying square

Discussion

7.	What disturbs the mirror's contemplation of the opposite wall?
Answer» What disturbs the mirror's contemplation of the opposite wall?

Discussion

8.	16.Two chambers containing m1 gram and m2 gram of a gas at pressures P1 and P2 respectively are put in communication with each other.,temperature remaining constant.What will be the common pressure reached?
Answer» 16.Two chambers containing m1 gram and m2 gram of a gas at pressures P1 and P2 respectively are put in communication with each other.,temperature remaining constant.What will be the common pressure reached?

Discussion

9.	The electric force between two identical charge particle having separation r between them is F. If separation between them is increased twice to initial separation keeping charge constant, then new electrical force between them is
Answer» The electric force between two identical charge particle having separation $r$ between them is $F$ . If separation between them is increased twice to initial separation keeping charge constant, then new electrical force between them is

Discussion

10.	an object of height 2.0 cm is placed perpendicular to the principal axis of a concave lens of focal length 12cm.find the height of the image,if the object is placed at a dis†an ce of8.0 cm from the lens?
Answer» an object of height 2.0 cm is placed perpendicular to the principal axis of a concave lens of focal length 12cm.find the height of the image,if the object is placed at a dis†an ce of8.0 cm from the lens?

Discussion

11.	Explain in detail ; why ray of light bends toward the normal , when it moves from rarer medium to denser medium
Answer» Explain in detail ; why ray of light bends toward the normal , when it moves from rarer medium to denser medium

Discussion

12.	What are the conditions in which light will behave as a wave, particle and ray? please specify correctly.
Answer» What are the conditions in which light will behave as a wave, particle and ray? please specify correctly.

Discussion

13.	Which of the following properties of a proton can change while it moves freely in a uniform magnetic field?
Answer» Which of the following properties of a proton can change while it moves freely in a uniform magnetic field?

Discussion

14.	Question 13 (a)A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil?
Answer» Question 13 (a) A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil?

Discussion

15.	Answer the following questions in about 120 words.(i) Describe how communities have conserved and protected forests and wildlife in India.(ii) Write a note on good practices towards conserving forest and wildlife.
Answer» Answer the following questions in about 120 words. (i) Describe how communities have conserved and protected forests and wildlife in India. (ii) Write a note on good practices towards conserving forest and wildlife.

15.

Answer the following questions in about 120 words.(i) Describe how communities have conserved and protected forests and wildlife in India.(ii) Write a note on good practices towards conserving forest and wildlife.

Answer»

Answer the following questions in about 120 words.

(i) Describe how communities have conserved and protected forests and wildlife in India.

(ii) Write a note on good practices towards conserving forest and wildlife.

Discussion

16.	what is backbondin
Answer» what is backbondin

Discussion

17.	How long are the energy resources of the earth like coal, petroleum and natural gas expected to last ?
Answer» How long are the energy resources of the earth like coal, petroleum and natural gas expected to last ?

Discussion

18.	if a ray of light is incident from rarer medium at an angle 45degree on the plane surface which separates two medium having refractive index 1 and \sqrt{2 } for rarer and denser medium respectively
Answer» if a ray of light is incident from rarer medium at an angle 45degree on the plane surface which separates two medium having refractive index 1 and \sqrt{2 } for rarer and denser medium respectively

Discussion

19.	The angle of elevation of the top of a tower from the top and foot of 100m building are 30∘ and 45∘ respectively. The height of the tower is
Answer» The angle of elevation of the top of a tower from the top and foot of 100m building are $30^{\circ} a n d 45^{\circ}$ respectively. The height of the tower is

Discussion

20.	A light and a heavy object have the same momentum. Which one of the following statements is correct regarding the kinetic energy of these two objects?
Answer» A light and a heavy object have the same momentum. Which one of the following statements is correct regarding the kinetic energy of these two objects?

Discussion

21.	Name the products of combustion of fossil fuels like coal and petroleum products. How do they affect us and our environment?
Answer» Name the products of combustion of fossil fuels like coal and petroleum products. How do they affect us and our environment?

Discussion

22.	a uniform meter scale can be balanced at 70cm mark when mass of 0.005kg is hung from 94cm mark 1.draw diagram of arrangement 2.find mass and meter scale
Answer» a uniform meter scale can be balanced at 70cm mark when mass of 0.005kg is hung from 94cm mark 1.draw diagram of arrangement 2.find mass and meter scale

Discussion

23.	A lens having two spherical surfaces bulging outward is called ______________.
Answer» A lens having two spherical surfaces bulging outward is called ______________.

Discussion

24.	An electric bulb rated for 500 W at 100 V is used in a circuit having a 200 V supply. The resistance R that must be put in series with the bulb, so that the bulb draws 500W, is
Answer» An electric bulb rated for $500 W$ at $100 V$ is used in a circuit having a $200 V$ supply. The resistance $R$ that must be put in series with the bulb, so that the bulb draws $500 W$ , is

Discussion

25.	An object is placed at a distance of 15 cm from convex lens of focal length 10 cm . Find the distance at which a convex mirror of focal length 10 cm should be placed on the other side from the lens so that final image coincide with the object itself: 20cm ; 10 cm ; 15cm; 30cm
Answer» An object is placed at a distance of 15 cm from convex lens of focal length 10 cm . Find the distance at which a convex mirror of focal length 10 cm should be placed on the other side from the lens so that final image coincide with the object itself: 20cm ; 10 cm ; 15cm; 30cm

Discussion

26.	Four students A, B, C and D showed the following traces of the path of a ray of light passing through a rectangular glass slab.The trace most likely to be correct is that of student:(1) A(2) B(3) C(4) D
Answer» Four students A, B, C and D showed the following traces of the path of a ray of light passing through a rectangular glass slab. The trace most likely to be correct is that of student: (1) A (2) B (3) C (4) D

Discussion

27.	The work done by Earth’s gravitational field on moon when the moon completes half a revolution is
Answer» The work done by Earth’s gravitational field on moon when the moon completes half a revolution is

Discussion

28.	An electron whose em is 1.76×1011 C/kg enters a region of a uniform magnetic field of induction 2×10−3 T with velocity of 3×106 ms−1 in a direction making an angle of 45∘ with the field. The pitch of its helical path in the region is
Answer» An electron whose $\frac{e}{m}$ is $1.76 \times 10^{11} C/kg$ enters a region of a uniform magnetic field of induction $2 \times 10^{- 3} T$ with velocity of $3 \times 10^{6} {ms}^{- 1}$ in a direction making an angle of $45^{\circ}$ with the field. The pitch of its helical path in the region is

Discussion

29.	122.A semicircular loop of radius R us rotated with an angular velocity 'w' perpendicular the plane of a magnetic field B as shown.Emf induced in the loop is
Answer» 122.A semicircular loop of radius R us rotated with an angular velocity 'w' perpendicular the plane of a magnetic field B as shown.Emf induced in the loop is

Discussion

30.	Name the energy transformation that occur in electrical cell
Answer» Name the energy transformation that occur in electrical cell

Discussion

31.	What is the difference between scalar and vector quantities?
Answer» What is the difference between scalar and vector quantities?

Discussion

32.	An object of height 1 cm is kept perpendicular to the principal axis of a convex mirror of radius of curvature 20 cm. Distance of the object from the mirror is 20 cm. If the distance between heads of the image and the object will be √1601×xy cm, then what is the value of y−x.
Answer» An object of height $1 cm$ is kept perpendicular to the principal axis of a convex mirror of radius of curvature $20 cm$ . Distance of the object from the mirror is $20 cm$ . If the distance between heads of the image and the object will be $\sqrt{\frac{1601 \times x}{y}}$ cm, then what is the value of $y - x$ .

Discussion

33.	For reflection of sound, " The size of the reflecting surface should be bigger than the wavelength of sound ." Why ?
Answer» For reflection of sound, " The size of the reflecting surface should be bigger than the wavelength of sound ." Why ?

Discussion

34.	What is the near point of a person suffering from hypermetropia?
Answer» What is the near point of a person suffering from hypermetropia?

Discussion

35.	A 50 cm tall object is at a very large distance from a diverging lens. A virtual, erect and diminished image of the object is formed at a distance of 20 cm in front of the lens. How much is the focal length of the lens ?
Answer» A 50 cm tall object is at a very large distance from a diverging lens. A virtual, erect and diminished image of the object is formed at a distance of 20 cm in front of the lens. How much is the focal length of the lens ?

Discussion

36.	The coagulating power of electrolytes having ions Na+,Al3+ and Ba2+ for arsenic aulphide sol increase in the order
Answer» The coagulating power of electrolytes having ions $N a^{+}, A l^{3 +}$ and $B a^{2 +}$ for arsenic aulphide sol increase in the order

Discussion

37.	Two capacitor of 6 μ F and 12 μ F, each rated to 200 V respectively are connected in series. The maximum voltage that can be applied to the series combination of the given capacitors is (1) 200 V (2) 400 V (3) 300 V (4) 600 V
Answer» Two capacitor of 6 μ F and 12 μ F, each rated to 200 V respectively are connected in series. The maximum voltage that can be applied to the series combination of the given capacitors is (1) 200 V (2) 400 V (3) 300 V (4) 600 V

Discussion

38.	A current of 200 Milli ampere flows through 4 k ohm resistance. What is the potential difference across the resistor?
Answer» A current of 200 Milli ampere flows through 4 k ohm resistance. What is the potential difference across the resistor?

Discussion

39.	Two forces F1=5 N and F2=8 N acting at points A and B on a rod pivoted at a point O, such that OA = 2 m and OB = 4 m. Calculate the net torque of the two forces about O.
Answer» Two forces $F_{1} = 5 N$ and $F_{2} = 8 N$ acting at points A and B on a rod pivoted at a point O, such that OA = $2 m$ and OB = $4 m$ . Calculate the net torque of the two forces about O.

39.

Two forces F1=5 N and F2=8 N acting at points A and B on a rod pivoted at a point O, such that OA = 2 m and OB = 4 m. Calculate the net torque of the two forces about O.

Answer»

Two forces $F_{1} = 5 N$ and $F_{2} = 8 N$ acting at points A and B on a rod pivoted at a point O, such that OA = $2 m$ and OB = $4 m$ . Calculate the net torque of the two forces about O.

Discussion

40.	What are the two laws of refraction of light?
Answer» What are the two laws of refraction of light?

Discussion

41.	Amount of light entering in human eye is controlled by:
Answer» Amount of light entering in human eye is controlled by:

Discussion

42.	A glass spbere with 10 cm radius has a 5cm radius spherical hole at its centre. A narrow beam of parallel light is directed into the sphere. Find the location of final image produced ? The index of refraction of the glass is 1.5
Answer» A glass spbere with 10 cm radius has a 5cm radius spherical hole at its centre. A narrow beam of parallel light is directed into the sphere. Find the location of final image produced ? The index of refraction of the glass is 1.5

Discussion

43.	What kind of mirror can have a focal length of, - 20 cm ?
Answer» What kind of mirror can have a focal length of, - 20 cm ?

Discussion

44.	The radius of the earth is R. If a body is taken to aheight 3R from the surface of the Earth, change inpotential energy is:(a) 3 mgR(b) mgR3(c) mgR(d) mgRThe coefficient of thermal conductivity of conner is
Answer» The radius of the earth is R. If a body is taken to aheight 3R from the surface of the Earth, change inpotential energy is:(a) 3 mgR(b) mgR3(c) mgR(d) mgRThe coefficient of thermal conductivity of conner is

Discussion

45.	I take 2 line segments AB and CD. Initially I keep them coincident so that points A & C and points B & D are coincident. Now I start to rotate line segment CD about point D so that D and B continue to be coincident, but no other points on the 2 line segments are coincident anymore. If CD is rotated till AB and CD become coincident again, the distance covered by point C is x. Instead, if the distance covered byC is a distance y which is less than x, and the angle covered by CD with respect to its starting position is θ, then find the relation between x, y and θ. Here assume that angle θ is in degrees.
Answer» I take 2 line segments AB and CD. Initially I keep them coincident so that points A & C and points B & D are coincident. Now I start to rotate line segment CD about point D so that D and B continue to be coincident, but no other points on the 2 line segments are coincident anymore. If CD is rotated till AB and CD become coincident again, the distance covered by point C is $x$ . Instead, if the distance covered byC is a distance y which is less than $x$ , and the angle covered by CD with respect to its starting position is $θ$ , then find the relation between $x$ , y and $θ$ . Here assume that angle $θ$ is in degrees.

Discussion

46.	A bulb can't be used in place of a resistor to verify Ohm's law. Why?
Answer» A bulb can't be used in place of a resistor to verify Ohm's law. Why?

Discussion

47.	under what condition will the current in a wire be the same when connected in series and in parallel
Answer» under what condition will the current in a wire be the same when connected in series and in parallel

Discussion

48.	a) What do you understand by “Watershed Management”? List any two advantages of watershed management. b) “Human beings occupy the top level in any food chain.” What are the consequences of this on our body?
Answer» a) What do you understand by “Watershed Management”? List any two advantages of watershed management. b) “Human beings occupy the top level in any food chain.” What are the consequences of this on our body?

Discussion

49.	Explanation of vandegraf generator
Answer» Explanation of vandegraf generator

Discussion

50.	diameter of sun subtends an angle of 0.5 degree at pole of concave mirror.radius of curvature of mirror is 1.5.find diameter of image of sun.consider distance of sun from mirror infinite
Answer» diameter of sun subtends an angle of 0.5 degree at pole of concave mirror.radius of curvature of mirror is 1.5.find diameter of image of sun.consider distance of sun from mirror infinite

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Is weak nuclear force independent of charge

5.A current of 5 ampere flows along a thin wire shaped as shown in the figure the radius of the curved part of the wire is equal to one 20 mm and the angle 2x =90^° . find the magnetic induction of the field at point O

Two convex lenses A and B of the same aperture have thickness 1 cm and 1.5 cm respectively. Which will have a greater focal length?

138. A charged particle, having charge q accelerated through a potential difference V enters a perpendicular magnetic field in which it experiences a force F. If V is increased to 5 V, the particle will experience a force 1) F 2) 5F 3) F/5 4) 5 F

A disc is placed on the surface of a pond filled with liquid of refractive index 53. A source of light is placed 4 m below the surface of the liquid. The minimum area of the disc so that light does not come out of the liquid into air is about

87.Work done to rotate a current carrying square loop placed infront of long current carrying square

What disturbs the mirror's contemplation of the opposite wall?

16.Two chambers containing m1 gram and m2 gram of a gas at pressures P1 and P2 respectively are put in communication with each other.,temperature remaining constant.What will be the common pressure reached?

The electric force between two identical charge particle having separation r between them is F. If separation between them is increased twice to initial separation keeping charge constant, then new electrical force between them is

an object of height 2.0 cm is placed perpendicular to the principal axis of a concave lens of focal length 12cm.find the height of the image,if the object is placed at a dis†an ce of8.0 cm from the lens?

Explain in detail ; why ray of light bends toward the normal , when it moves from rarer medium to denser medium

What are the conditions in which light will behave as a wave, particle and ray? please specify correctly.

Which of the following properties of a proton can change while it moves freely in a uniform magnetic field?

Question 13 (a)A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil?

Answer the following questions in about 120 words.(i) Describe how communities have conserved and protected forests and wildlife in India.(ii) Write a note on good practices towards conserving forest and wildlife.

what is backbondin

How long are the energy resources of the earth like coal, petroleum and natural gas expected to last ?

if a ray of light is incident from rarer medium at an angle 45degree on the plane surface which separates two medium having refractive index 1 and \sqrt{2 } for rarer and denser medium respectively

The angle of elevation of the top of a tower from the top and foot of 100m building are 30∘ and 45∘ respectively. The height of the tower is

A light and a heavy object have the same momentum. Which one of the following statements is correct regarding the kinetic energy of these two objects?

Name the products of combustion of fossil fuels like coal and petroleum products. How do they affect us and our environment?

a uniform meter scale can be balanced at 70cm mark when mass of 0.005kg is hung from 94cm mark 1.draw diagram of arrangement 2.find mass and meter scale

A lens having two spherical surfaces bulging outward is called ______________.

An electric bulb rated for 500 W at 100 V is used in a circuit having a 200 V supply. The resistance R that must be put in series with the bulb, so that the bulb draws 500W, is

An object is placed at a distance of 15 cm from convex lens of focal length 10 cm . Find the distance at which a convex mirror of focal length 10 cm should be placed on the other side from the lens so that final image coincide with the object itself: 20cm ; 10 cm ; 15cm; 30cm

Four students A, B, C and D showed the following traces of the path of a ray of light passing through a rectangular glass slab.The trace most likely to be correct is that of student:(1) A(2) B(3) C(4) D

The work done by Earth’s gravitational field on moon when the moon completes half a revolution is

An electron whose em is 1.76×1011 C/kg enters a region of a uniform magnetic field of induction 2×10−3 T with velocity of 3×106 ms−1 in a direction making an angle of 45∘ with the field. The pitch of its helical path in the region is

122.A semicircular loop of radius R us rotated with an angular velocity 'w' perpendicular the plane of a magnetic field B as shown.Emf induced in the loop is

Name the energy transformation that occur in electrical cell

What is the difference between scalar and vector quantities?

An object of height 1 cm is kept perpendicular to the principal axis of a convex mirror of radius of curvature 20 cm. Distance of the object from the mirror is 20 cm. If the distance between heads of the image and the object will be √1601×xy cm, then what is the value of y−x.

For reflection of sound, " The size of the reflecting surface should be bigger than the wavelength of sound ." Why ?

What is the near point of a person suffering from hypermetropia?

A 50 cm tall object is at a very large distance from a diverging lens. A virtual, erect and diminished image of the object is formed at a distance of 20 cm in front of the lens. How much is the focal length of the lens ?

The coagulating power of electrolytes having ions Na+,Al3+ and Ba2+ for arsenic aulphide sol increase in the order

Two capacitor of 6 μ F and 12 μ F, each rated to 200 V respectively are connected in series. The maximum voltage that can be applied to the series combination of the given capacitors is (1) 200 V (2) 400 V (3) 300 V (4) 600 V

A current of 200 Milli ampere flows through 4 k ohm resistance. What is the potential difference across the resistor?

Two forces F1=5 N and F2=8 N acting at points A and B on a rod pivoted at a point O, such that OA = 2 m and OB = 4 m. Calculate the net torque of the two forces about O.

What are the two laws of refraction of light?

Amount of light entering in human eye is controlled by:

A glass spbere with 10 cm radius has a 5cm radius spherical hole at its centre. A narrow beam of parallel light is directed into the sphere. Find the location of final image produced ? The index of refraction of the glass is 1.5

What kind of mirror can have a focal length of, - 20 cm ?

The radius of the earth is R. If a body is taken to aheight 3R from the surface of the Earth, change inpotential energy is:(a) 3 mgR(b) mgR3(c) mgR(d) mgRThe coefficient of thermal conductivity of conner is

A bulb can't be used in place of a resistor to verify Ohm's law. Why?

under what condition will the current in a wire be the same when connected in series and in parallel

a) What do you understand by “Watershed Management”? List any two advantages of watershed management. b) “Human beings occupy the top level in any food chain.” What are the consequences of this on our body?

Explanation of vandegraf generator

diameter of sun subtends an angle of 0.5 degree at pole of concave mirror.radius of curvature of mirror is 1.5.find diameter of image of sun.consider distance of sun from mirror infinite