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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The energy in the reactor of a nuclear power station is produced by the process of : (a) nuclear diffusion (b) nuclear fission (c) nuclear fusion (d) nuclear fermentation |
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Answer» The energy in the reactor of a nuclear power station is produced by the process of : (a) nuclear diffusion (b) nuclear fission (c) nuclear fusion (d) nuclear fermentation |
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| 2. |
Two conductors A and B are connected to 120V and 200V source repectively. 'A' has a resistivity of 50 ohm-metre and 'B' has a resistivity of 100ohm-metre. Wire A & B has a cross sectional radius of 50cm and 60cm respectively. The wires have a fixed volume of 1 m3. If current flows through each wire for 5 seconds then the heat generated in the wire B is _____ times wire A. |
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Answer» Two conductors A and B are connected to 120V and 200V source repectively. 'A' has a resistivity of 50 ohm-metre and 'B' has a resistivity of 100ohm-metre. Wire A & B has a cross sectional radius of 50cm and 60cm respectively. The wires have a fixed volume of 1 m3. If current flows through each wire for 5 seconds then the heat generated in the wire B is _____ times wire A. |
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| 3. |
A ray through the Centre of Curvature hitting the spherical mirror makes an angle of ___ with the normal. |
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Answer» A ray through the Centre of Curvature hitting the spherical mirror makes an angle of |
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| 4. |
If the focal length of a spherical mirror is 12.5 less cm, what will be its radius of curvature? |
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Answer» If the focal length of a spherical mirror is 12.5 less cm, what will be its radius of curvature? |
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| 5. |
A ray of light from a denser medium strikes a rare medium at angle of incidence i as shown in figure. The reflected and refracted rays make an angle of 90∘ with each other. The angles of reflection and refraction are r and r'. The critical angle is |
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Answer» A ray of light from a denser medium strikes a rare medium at angle of incidence i as shown in figure. The reflected and refracted rays make an angle of 90∘ with each other. The angles of reflection and refraction are r and r'. The critical angle is |
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| 6. |
(a) What is meant by the dispersion of white light? Describe the formation of the rainbow in the sky with the help of a diagram.(b)What is hypermetropia? Draw ray diagrams to show the image formation of an object by: (i) Hypermetropic eye (ii) Correction made with a suitable lens for the hypermetropic eye. |
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Answer» (a) What is meant by the dispersion of white light? Describe the formation of the rainbow in the sky with the help of a diagram. (b)What is hypermetropia? Draw ray diagrams to show the image formation of an object by: (i) Hypermetropic eye (ii) Correction made with a suitable lens for the hypermetropic eye. |
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| 7. |
At what distance from a concave mirror of focal length 25 cm should an object be placed ? so that the size of image is equal to the size of object ___ |
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Answer» At what distance from a concave mirror of focal length 25 cm should an object be placed ? so that the size of image is equal to the size of object |
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| 8. |
A man dropped a stone into a lake from a tower 500 m high. The sound of the splash will be heard by the man approximately after (take g=10 m/s2and speed of sound in air to be 340 m/s ) |
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Answer» A man dropped a stone into a lake from a tower 500 m high. The sound of the splash will be heard by the man approximately after (take g=10 m/s2and speed of sound in air to be 340 m/s ) |
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| 9. |
An object placed in front of a convex lens resulted in an image whose size is the same as the object. Find out the focal length of the convex lens, if the object distance is 30 cm.15 |
Answer» An object placed in front of a convex lens resulted in an image whose size is the same as the object. Find out the focal length of the convex lens, if the object distance is 30 cm.
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| 10. |
Which has more resistance: (a) a long piece fo nichrome wire or a short one? (b) a thick piece of nichrome wire or a thin piece? |
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Answer» Which has more resistance: |
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| 11. |
A triangular loop of side a carries a current I. It is placed in a magnetic filed B such that the plane of the loop makes an angle 30∘ with the direction of B. The torque on the loop is |
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Answer» A triangular loop of side a carries a current I. It is placed in a magnetic filed B such that the plane of the loop makes an angle 30∘ with the direction of B. The torque on the loop is |
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| 12. |
Three resistances 2Ω,3Ω and 4Ω are connected in parallel. The ratio of currents passing through them when a potential difference is applied across its ends will be: |
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Answer» Three resistances 2Ω,3Ω and 4Ω are connected in parallel. The ratio of currents passing through them when a potential difference is applied across its ends will be: |
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| 13. |
The unit of acceleration and momentum is |
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Answer» The unit of acceleration and momentum is |
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| 14. |
A far sighted person can see object beyondb. 71cm clearly if separartion. Between glasses and eye lens is 2cm bthen find focal length bof glass. Explain with diagram n reasons for step in detail |
| Answer» A far sighted person can see object beyondb. 71cm clearly if separartion. Between glasses and eye lens is 2cm bthen find focal length bof glass. Explain with diagram n reasons for step in detail | |
| 15. |
A ray of light travelling in the air falls on the surface of a glass slab at an angle 45∘ with the normal. The refractive index of glass is 1.5. Calculate the angle of refraction. |
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Answer» A ray of light travelling in the air falls on the surface of a glass slab at an angle 45∘ with the normal. The refractive index of glass is 1.5. Calculate the angle of refraction. |
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| 16. |
A block and tackle system has 5 pulleys. If an effort of 1250 N is needed in the downward direction to raise a load of 5000 N calculate(a) M.A. (b) V.R.(c)efficiency of the system. Also find the magnitude of extra force needed to overcome the friction. In this question it is said that the extra force needed to overcome the friction. Now according to the answer it is 3750 Newton. If that is true then how will the efficiency amount to 100% because considering the extra force and the actual force the total effort would be 5000 Newton then the mechanical advantage would be 1 and the efficiency would amount to 20% only. Then how will the friction be overcomed? |
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Answer»
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| 17. |
An alternator has a synchronous reactance of 20% and negligible resistance. Its voltage regulation when working on full load at 0.8 pf lag will be _________%13 |
Answer» An alternator has a synchronous reactance of 20% and negligible resistance. Its voltage regulation when working on full load at 0.8 pf lag will be _________%
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| 18. |
Which of the following correctly shows the order of the wavelength of the Electromagnetic waves? |
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Answer» Which of the following correctly shows the order of the wavelength of the Electromagnetic waves? |
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| 19. |
If the key in the arrangement, in the given figure, is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are: |
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Answer» If the key in the arrangement, in the given figure, is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are: |
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| 20. |
A More amount of sugar is obtained in 1kg weight:(1)At North Pole(2)At equator(3)Between pole and equator(4)At south pole |
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Answer» A More amount of sugar is obtained in 1kg weight: (1)At North Pole (2)At equator (3)Between pole and equator (4)At south pole |
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| 21. |
Solve the following examples.a. If the angle between the plane mirror and the incident ray is 40∘, what are the angles of incidence and reflection?b. If the angle between the mirror and reflected ray is 23∘, what is the angle of incidence of the incidence ray? |
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Answer» Solve the following examples. a. If the angle between the plane mirror and the incident ray is 40∘, what are the angles of incidence and reflection? b. If the angle between the mirror and reflected ray is 23∘, what is the angle of incidence of the incidence ray? |
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| 22. |
I coil is rotated in a magnetic field The frequency of change in its induced emf is |
| Answer» I coil is rotated in a magnetic field The frequency of change in its induced emf is | |
| 23. |
In your laboratory you trace the path of light rays through a glass slab for different values of angle of incidence (∠i) and in each case measure the values of the corresponding angle of refraction (∠r) and angle of emergence (∠e). On the basis of your observations your correct conclusion is : (a) ∠i is more than ∠r, but nearly equal to ∠e (b) ∠i is less than ∠r, but nearly equal to ∠e (c) ∠i is more than ∠e, but nearly equal to ∠r (d) ∠i is less than ∠e, but nearly equal to ∠r |
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Answer» In your laboratory you trace the path of light rays through a glass slab for different values of angle of incidence (∠i) and in each case measure the values of the corresponding angle of refraction (∠r) and angle of emergence (∠e). On the basis of your observations your correct conclusion is : (a) ∠i is more than ∠r, but nearly equal to ∠e (b) ∠i is less than ∠r, but nearly equal to ∠e (c) ∠i is more than ∠e, but nearly equal to ∠r (d) ∠i is less than ∠e, but nearly equal to ∠r |
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| 24. |
In anexperiment 4.5 kg of a fuel was completely burnt. The heat producedwas measured to be 180,000 kJ. Calculate the calorific value of thefuel. |
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Answer» In an |
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| 25. |
17. A beam of light travelling in air enters into a liquid .It's speed reduces by 30%.the refractive index of light with respect to air is |
| Answer» 17. A beam of light travelling in air enters into a liquid .It's speed reduces by 30%.the refractive index of light with respect to air is | |
| 26. |
What is advanced sunrise and delayed sunset? |
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Answer» What is advanced sunrise and delayed sunset? |
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| 27. |
A ray of light is inclined to one face of the prism at an angle of 500. If the angle of prism is 700 and the ray is deviated through an angle of 460 then the angle which the emergent ray makes with the second face of the prism is |
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Answer» A ray of light is inclined to one face of the prism at an angle of 500. If the angle of prism is 700 and the ray is deviated through an angle of 460 then the angle which the emergent ray makes with the second face of the prism is |
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| 28. |
Q. An object 60 cm tall is placed on the principal axis of a convex lens and its 30 cm tall image is formed on the screen placed at a distance of 40 cm from the object. What isthe focal length of the lens? |
| Answer» Q. An object 60 cm tall is placed on the principal axis of a convex lens and its 30 cm tall image is formed on the screen placed at a distance of 40 cm from the object. What isthe focal length of the lens? | |
| 29. |
At 290K the rate cons†an t of a reaction is 3.2×10^-3.Its value at 310K will be: 1)1.28×10^-2 2)3.2×10^- |
| Answer» At 290K the rate cons†an t of a reaction is 3.2×10^-3.Its value at 310K will be: 1)1.28×10^-2 2)3.2×10^- | |
| 30. |
Why does current flow from positive to negative terminal of the circuit when electrons move from negative to positive of the circuit? |
| Answer» Why does current flow from positive to negative terminal of the circuit when electrons move from negative to positive of the circuit? | |
| 31. |
Explain why an induced current must flow in such a direction so as to oppose the change producing it. |
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Answer» Explain why an induced current must flow in such a direction so as to oppose the change producing it. |
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| 32. |
Identify the condition in which image formed is real, inverted and diminished from the following. |
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Answer» Identify the condition in which image formed is real, inverted and diminished from the following. |
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| 33. |
34. Magnetic lorentz force cannot change the speed and kinetic energy of a charged particle but changes its velocity and momentum(only direction). What does it mean? |
| Answer» 34. Magnetic lorentz force cannot change the speed and kinetic energy of a charged particle but changes its velocity and momentum(only direction). What does it mean? | |
| 34. |
The wire used in an electric fuse should conduct electricity. What other property must it have? |
| Answer» The wire used in an electric fuse should conduct electricity. What other property must it have? | |
| 35. |
Give one example each where high specific heat capacity of water is used (i) as coolant,(ii) as heat reservoir. |
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Answer» Give one example each where high specific heat capacity of water is used (i) as coolant,(ii) as heat reservoir. |
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| 36. |
A conducting cycle wheel, with each spoke of length l, is rotating about its geometrical axis, with uniform angular velocity ω, in a uniform magnetic field as shown in the figure. If the number of spokes are N, then calculate the induced emf between the center and the rim of the wheel. |
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Answer» A conducting cycle wheel, with each spoke of length l, is rotating about its geometrical axis, with uniform angular velocity ω, in a uniform magnetic field as shown in the figure. If the number of spokes are N, then calculate the induced emf between the center and the rim of the wheel. |
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| 37. |
Magnetic field at the centre of a regular hexagon shaped conductor of side a, carrying current i is |
| Answer» Magnetic field at the centre of a regular hexagon shaped conductor of side a, carrying current i is | |
| 38. |
Q1:- If 2.25 × 10 power20 electrons pass through a wire in one minute, find the magnitude of the current flowing through the wire. |
| Answer» Q1:- If 2.25 × 10 power20 electrons pass through a wire in one minute, find the magnitude of the current flowing through the wire. | |
| 39. |
a rope of length l and mass'm' is connected to a chain of length l and mass 2m and hung vertically .what is the change in gravitational potential energy if the system is inverted and hung from the same point(rope on upper part in first situation) |
| Answer» a rope of length l and mass'm' is connected to a chain of length l and mass 2m and hung vertically .what is the change in gravitational potential energy if the system is inverted and hung from the same point(rope on upper part in first situation) | |
| 40. |
If a nut can be opened with a minimum force of 6 N using a wrench of length 12 cm, what is the moment of force needed to turn the nut? |
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Answer» If a nut can be opened with a minimum force of 6 N using a wrench of length 12 cm, what is the moment of force needed to turn the nut? |
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| 41. |
Can a 5 A fuse be used in wire carrying 15 A current? Why? [2 MARKS] |
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Answer» Can a 5 A fuse be used in wire carrying 15 A current? Why? [2 MARKS] |
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| 42. |
A projectile can have the same range R for two angles of projection. if t1 and t2 be the times of flight in the two cases ,then the initial velocity of projectile is1] 1/2 g(t1^2+t2^2)^1/22] 1/4g(t1^2+t2^2)^1/23] gt1t24] 2gt1t2 |
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Answer» A projectile can have the same range R for two angles of projection. if t1 and t2 be the times of flight in the two cases ,then the initial velocity of projectile is 1] 1/2 g(t1^2+t2^2)^1/2 2] 1/4g(t1^2+t2^2)^1/2 3] gt1t2 4] 2gt1t2 |
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| 43. |
How does large hadron collider works |
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Answer» How does large hadron collider works |
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| 44. |
The spacing between the magnetic field lines _____ as we move away from the current carrying conductor. |
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Answer» The spacing between the magnetic field lines _____ as we move away from the current carrying conductor. |
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| 45. |
(a) For which position of an object, a concave mirror forms a real image equal in size to the object?(b) State one use of a concave mirror.(c) An object of height 1 cm is placed at a distance of 15 cm from a concave mirror of radius of curvature 20 cm. Find the position, nature and size of the image formed. |
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Answer» (a) For which position of an object, a concave mirror forms a real image equal in size to the object? (b) State one use of a concave mirror. (c) An object of height 1 cm is placed at a distance of 15 cm from a concave mirror of radius of curvature 20 cm. Find the position, nature and size of the image formed. |
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| 46. |
Explain power theorem. |
| Answer» Explain power theorem. | |
| 47. |
The minimum distance between an object and its real image formed by a convex lens is: |
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Answer» The minimum distance between an object and its real image formed by a convex lens is: |
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| 48. |
A charge Q is uniformly distributed over a rod of length L. Consider a hypothetical sphere of radius L2 with the centre of the sphere at one end of the rod. Find the value of flux passing through the entire surface of the sphere. |
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Answer» A charge Q is uniformly distributed over a rod of length L. Consider a hypothetical sphere of radius L2 with the centre of the sphere at one end of the rod. Find the value of flux passing through the entire surface of the sphere. |
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| 49. |
21. Draw a ray diagram to represent the nature,position and relative size of the image for an object formed by convex mirror at 2f |
| Answer» 21. Draw a ray diagram to represent the nature,position and relative size of the image for an object formed by convex mirror at 2f | |
| 50. |
Two point particles of mass m and 2m are initially seperated by a dis†an ce 4a . They are then released to become free to move . Find the velocities of both the particles when dis†an ce between them reduces to a |
| Answer» Two point particles of mass m and 2m are initially seperated by a dis†an ce 4a . They are then released to become free to move . Find the velocities of both the particles when dis†an ce between them reduces to a | |
