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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. |
How and from where does the light gain its velocity after refraction from glass to air? |
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Answer» How and from where does the light gain its velocity after refraction from glass to air? |
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| 2. |
Find vevo whereve: Escape velocity of satellite at the surface of earth.vo: Orbital velocity of satellite orbiting at the surface of earth. |
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Answer» Find vevo where |
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| 3. |
What are the factors affecting refraction? |
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Answer» What are the factors affecting refraction? |
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| 4. |
Give me derivation for thin lens formulae step by step. |
| Answer» Give me derivation for thin lens formulae step by step. | |
| 5. |
A ray of light coming from a denser medium does not enter rarer medium and reflects back. This phenomenon is called ___. |
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Answer» A ray of light coming from a denser medium does not enter rarer medium and reflects back. This phenomenon is called ___. |
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| 6. |
one half of a convex lens is covered with a black paper.will this lens produce a complete image of the object |
| Answer» one half of a convex lens is covered with a black paper.will this lens produce a complete image of the object | |
| 7. |
A plano - convex lens becomes an optical system of 28 cm focal length when its plane surface is silvered and illuminated from left to right as shown in fig. A. If the same lens is instead silvered on the curved surface and illuminated from other side as in fig. B, it acts like an optical system of focal length 10 cm. The refractive index of the material of lens is |
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Answer» A plano - convex lens becomes an optical system of 28 cm focal length when its plane surface is silvered and illuminated from left to right as shown in fig. A. If the same lens is instead silvered on the curved surface and illuminated from other side as in fig. B, it acts like an optical system of focal length 10 cm. The refractive index of the material of lens is |
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| 8. |
In parallel combination, the total resistance of the circuit becomes ___the individual resistances. |
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Answer» In parallel combination, the total resistance of the circuit becomes |
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| 9. |
A positively charged ball is brought close to an electrically neutral isolated conductor. The conductor is then grounded while the ball is kept close.If the conductor is charged positively, charged negatively, or neutral if (a) the ball is first taken away and then the ground connection is removed?(b) the ground connection is first removed and then the ball is taken away? |
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Answer» A positively charged ball is brought close to an electrically neutral isolated conductor. The conductor is then grounded while the ball is kept close.If the conductor is charged positively, charged negatively, or neutral if (a) the ball is first taken away and then the ground connection is removed? (b) the ground connection is first removed and then the ball is taken away? |
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| 10. |
The Centre-State power distribution in India is similar to |
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Answer» The Centre-State power distribution in India is similar to |
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| 11. |
How fast should a man weighing 600N needs to run, so that his kinetic energy is 750J? Take g=10ms−2 |
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Answer» How fast should a man weighing 600N needs to run, so that his kinetic energy is 750J? Take g=10ms−2 |
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| 12. |
193 If pot. Energy of a body of masses m on the surface of earth is taken as zero then its pot. Energy at height h above the surface of earth |
| Answer» 193 If pot. Energy of a body of masses m on the surface of earth is taken as zero then its pot. Energy at height h above the surface of earth | |
| 13. |
What is the focal length of double concave lens kept in air with two spherical surfaces of radii R1=30 cm and R2=60 cm. Take refractive index of lens with respect to surrounding as n = 1.5. |
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Answer» What is the focal length of double concave lens kept in air with two spherical surfaces of radii R1=30 cm and R2=60 cm. Take refractive index of lens with respect to surrounding as n = 1.5. |
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| 14. |
62. If g is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth,is A)1/4mgr B)1/2mgr C)2mgr D)mgr |
| Answer» 62. If g is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth,is A)1/4mgr B)1/2mgr C)2mgr D)mgr | |
| 15. |
(a) Distinguish between the terms 'overloading' and 'short-circuiting' as used in domestic circuits.(b) Why are the coils of electric toasters made of an alloy rather than a pure metal? |
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Answer» (a) Distinguish between the terms 'overloading' and 'short-circuiting' as used in domestic circuits. (b) Why are the coils of electric toasters made of an alloy rather than a pure metal? |
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| 16. |
if f is focal length of lens & the separation of central maximum from first null of diffraction pattern is (lamda)/ain term of angle, then size of screen is f(lamda)/a . How? |
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Answer» if f is focal length of lens & the separation of central maximum from first null of diffraction pattern is (lamda)/a in term of angle, then size of screen is f(lamda)/a . How? |
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| 17. |
The phenomenon of light hitting a surface and then bouncing off is termed as ___ |
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Answer» The phenomenon of light hitting a surface and then bouncing off is termed as |
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| 18. |
Define dispersion of light. What are the colors obtained when a white light ray passes through a glass prism? |
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Answer» Define dispersion of light. What are the colors obtained when a white light ray passes through a glass prism? |
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| 19. |
Explain why planets do not twinkle at night. [2 MARKS] |
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Answer» Explain why planets do not twinkle at night. [2 MARKS] |
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| 20. |
Q1. Which physical quantity is represented by the inverse of the slope V-I graph ? Q2. what is the resistance in a wire due to ? |
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Answer» Q1. Which physical quantity is represented by the inverse of the slope V-I graph ? Q2. what is the resistance in a wire due to ? |
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| 21. |
The principal focus of a concave mirror is real while that of a convex mirror is....................... |
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Answer» The principal focus of a concave mirror is real while that of a convex mirror is....................... |
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| 22. |
45.Use Biot-Savart's law to derieve the expression for magnetic field due to circular coil(loop) of radius 'r' having 'n' turns at a point on the axis at a distance 'x' from its centre. |
| Answer» 45.Use Biot-Savart's law to derieve the expression for magnetic field due to circular coil(loop) of radius 'r' having 'n' turns at a point on the axis at a distance 'x' from its centre. | |
| 23. |
If all rays falling on a concave lens are parallel to the principal axis of the lens, what happens to them after they pass through the lens? |
| Answer» If all rays falling on a concave lens are parallel to the principal axis of the lens, what happens to them after they pass through the lens? | |
| 24. |
what is pseudo forc |
| Answer» what is pseudo forc | |
| 25. |
the maximum magnification which can be obtained with the help of a simple microscope is 6. If a point object is placed at a distance 3 cm from the microscope, then what was the position of image? |
| Answer» the maximum magnification which can be obtained with the help of a simple microscope is 6. If a point object is placed at a distance 3 cm from the microscope, then what was the position of image? | |
| 26. |
At t=0 a fly wheel is rotating with angular velocity omega it then undergoes uniform angular acceleration for a time t1 at the end of which the angular velocity is omega 1 how many revolution did the flywheel make during this time interval(1) 1/2( omega+omega1)t (2) omega t/2 pi(3) omega1t/2pi(4) (omega +omega1)t/4pi |
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Answer» At t=0 a fly wheel is rotating with angular velocity omega it then undergoes uniform angular acceleration for a time t1 at the end of which the angular velocity is omega 1 how many revolution did the flywheel make during this time interval (1) 1/2( omega+omega1)t (2) omega t/2 pi (3) omega1t/2pi (4) (omega +omega1)t/4pi |
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| 27. |
Will a rainbow form when sunlight is red(during sunset and sunrise)? |
| Answer» Will a rainbow form when sunlight is red(during sunset and sunrise)? | |
| 28. |
Why the magnetic field lines inside a current carrying solenoid is parallel straight lines? |
| Answer» Why the magnetic field lines inside a current carrying solenoid is parallel straight lines? | |
| 29. |
In an experiment for determination of focal length of the convex mirror, a convex lens of focal length 20 cm is placed on the optical bench and an object is placed at a distance of 30 cm from the lens, when convex mirror is introduced in between the lens and the real inverted image of the object the final image of object O is formed at O itself if the distance between lens and the mirror is 10 centimetre then focal length of the mirror is a. 10 centimetre b. 20 centimetre c. 25 centímetre d. 50 centimetre |
| Answer» In an experiment for determination of focal length of the convex mirror, a convex lens of focal length 20 cm is placed on the optical bench and an object is placed at a distance of 30 cm from the lens, when convex mirror is introduced in between the lens and the real inverted image of the object the final image of object O is formed at O itself if the distance between lens and the mirror is 10 centimetre then focal length of the mirror is a. 10 centimetre b. 20 centimetre c. 25 centímetre d. 50 centimetre | |
| 30. |
11. Net capacitance of 3 identical capacitors in series 1microfaraday. What will be Their net capacitance if connected in parallel? |
| Answer» 11. Net capacitance of 3 identical capacitors in series 1microfaraday. What will be Their net capacitance if connected in parallel? | |
| 31. |
A household uses the following electric appliances:(a) Refrigerator of rating 400 W for ten hours each day.(b) Two electric fans of rating 80 W each for twelve hours each day.(c) Six electric tubes of rating 18 W each for 6 hours each day.Calculate the electricity bill of the household for the month of June if the cost per unit of electric energy is ₹ 3.00. |
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Answer» A household uses the following electric appliances: (a) Refrigerator of rating 400 W for ten hours each day. (b) Two electric fans of rating 80 W each for twelve hours each day. (c) Six electric tubes of rating 18 W each for 6 hours each day. Calculate the electricity bill of the household for the month of June if the cost per unit of electric energy is ₹ 3.00. |
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| 32. |
A concave mirror of focal length f produces an image n times the size of the object. If image is real then the distance of object from the pole of mirror is |
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Answer» A concave mirror of focal length f produces an image n times the size of the object. If image is real then the distance of object from the pole of mirror is |
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| 33. |
In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represent metallic brushes. G represents galvanometer.As the coil starts to rotate, the current flows through ABCD as shown. The coil is rotating in: |
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Answer» In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represent metallic brushes. G represents galvanometer. As the coil starts to rotate, the current flows through ABCD as shown. The coil is rotating in: |
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| 34. |
The angular deviation is greatest for |
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Answer» The angular deviation is greatest for |
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| 35. |
Find the value of g (gravitational acceleration) |
| Answer» Find the value of g (gravitational acceleration) | |
| 36. |
What is the primary source of wind energy? |
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Answer» What is the primary source of wind energy? |
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| 37. |
21.The near point and far point of a person are at 60cm and 300cm respectively. Find the power of lens he should use while reading at 30cm. With this lens on the eye, what maximum distance is clearly visible? |
| Answer» 21.The near point and far point of a person are at 60cm and 300cm respectively. Find the power of lens he should use while reading at 30cm. With this lens on the eye, what maximum distance is clearly visible? | |
| 38. |
You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg? |
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Answer» You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg? |
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| 39. |
Find equivalent resistance |
| Answer» Find equivalent resistance | |
| 40. |
1. Let us assume that you have the power of creating the universe as it is. What is the minimum things u would need to do that ? 2. When you are pushing a box on the table, are u really touching the box ? Think in terms of your atoms interacting with the box's atoms ? 3. A ball when slide on a horizontal surface eventually comes to a stop ,even though seemingly no force is acting on it . Doesn't this contradict Gallelio's statement ? |
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Answer» 1. Let us assume that you have the power of creating the universe as it is. What is the minimum things u would need to do that ? 2. When you are pushing a box on the table, are u really touching the box ? Think in terms of your atoms interacting with the box's atoms ? 3. A ball when slide on a horizontal surface eventually comes to a stop ,even though seemingly no force is acting on it . Doesn't this contradict Gallelio's statement ? |
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| 41. |
Moving coil galvanometer operates on Permanent Magnet Moving Coll (PMMC) mechanism.Moving coil galvanometers are of two types(a) Suspended coll(b) Pivoted coil type or tangent galvanometer,Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. This torque tends to rotate the coil about its axis of suspension in such a way that the magnetic flux passing through the coil is maximum.(iv) In a moving coil galvanometer, having a coil of N-turns of area A and carrying current I is placed in a radial field of strength B. The torque acting on the coil is |
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Answer» Moving coil galvanometer operates on Permanent Magnet Moving Coll (PMMC) mechanism. Moving coil galvanometers are of two types Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. This torque tends to rotate the coil about its axis of suspension in such a way that the magnetic flux passing through the coil is maximum.
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| 42. |
Question 1A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R', then the ratio RR′ is:(a) 125(b) 15(c) 5(d) 25 |
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Answer» Question 1 |
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| 43. |
Why our wet clothes appear to be darker then the dry clothes? |
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Answer» Why our wet clothes appear to be darker then the dry clothes? |
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| 44. |
a long hollow conducting cylinder is kept coaxially inside another long hollow conducting cylinder of larger radius both are initially electrically neutral . The potential difference appears between two cylinder when charge is given to inner cylinder . why? |
| Answer» a long hollow conducting cylinder is kept coaxially inside another long hollow conducting cylinder of larger radius both are initially electrically neutral . The potential difference appears between two cylinder when charge is given to inner cylinder . why? | |
| 45. |
Find the electric field at point O, due to the segment of a ring, whose linear charge density is 8 C/cm. |
| Answer» Find the electric field at point O, due to the segment of a ring, whose linear charge density is 8 C/cm. | |
| 46. |
A student was given three resistors of 2 ohms, 3 ohms and 5 ohms by his teacher. The teacher asked him to connect these three resistors in such a way so as to obtain the minimum resistance.(a) In what way should the student connect the resistors?(b) Draw a diagram of the combination of resistors. |
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Answer» A student was given three resistors of 2 ohms, 3 ohms and 5 ohms by his teacher. The teacher asked him to connect these three resistors in such a way so as to obtain the minimum resistance. (a) In what way should the student connect the resistors? (b) Draw a diagram of the combination of resistors. |
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| 47. |
What is Ninhydrin? |
| Answer» What is Ninhydrin? | |
| 48. |
The critical angle for light entering from medium X into medium Y is q. The speed of light in medium X is u. The speed of light in medium Y is |
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Answer» The critical angle for light entering from medium X into medium Y is q. The speed of light in medium X is u. The speed of light in medium Y is |
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| 49. |
19.A wire, that passes through the hole is a small bead, is bent in the form of quarter of a circle. The wire is fixed vertically on ground. The bead is released from near top of wire and it slides along the wire without friction. As the bead moves from A to B, force applied on wire is A) always radially outwards B) always radially inwards C) radially outwards initially and radially inwards later D) radially inwards initially and radially outwards later The image is given below |
| Answer» 19.A wire, that passes through the hole is a small bead, is bent in the form of quarter of a circle. The wire is fixed vertically on ground. The bead is released from near top of wire and it slides along the wire without friction. As the bead moves from A to B, force applied on wire is A) always radially outwards B) always radially inwards C) radially outwards initially and radially inwards later D) radially inwards initially and radially outwards later The image is given below | |
| 50. |
The focal length of a concave lens is 20 cm. If an object is placed at a distance of 50 cm in front of this concave lens, where is the image formed? What is the nature of the image? |
| Answer» The focal length of a concave lens is 20 cm. If an object is placed at a distance of 50 cm in front of this concave lens, where is the image formed? What is the nature of the image? | |
