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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. |
A block of mass 'm' moving with speed 'v' collides with another block of mass '2m' which was at rest. The lighter block comes to rest after the collision. The coefficient of restitution is |
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Answer» A block of mass 'm' moving with speed 'v' collides with another block of mass '2m' which was at rest. The lighter block comes to rest after the collision. The coefficient of restitution is |
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| 2. |
A child is moving on a skateboard at the speed of 2 m/s. When a force is applied to him, his speed becomes 3 m/s. Find the work done by the external force on the child, given the weight of the child is 20 kg. |
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Answer» A child is moving on a skateboard at the speed of 2 m/s. When a force is applied to him, his speed becomes 3 m/s. Find the work done by the external force on the child, given the weight of the child is 20 kg. |
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| 3. |
When an electric lamp is connected to 12 V battery, it draws a current of 0.5 A. The power of the lamp is : (a) 0.5 W (b) 6 W (c) 12 W (d) 24 W |
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Answer» When an electric lamp is connected to 12 V battery, it draws a current of 0.5 A. The power of the lamp is : (a) 0.5 W (b) 6 W (c) 12 W (d) 24 W |
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| 4. |
Masses of three wires of copper are in the ratio 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistances will be |
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Answer» Masses of three wires of copper are in the ratio 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistances will be |
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| 5. |
Name one medical technique which is based on magnetiism produced in the human body. For what purpose is this technique used ? |
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Answer» Name one medical technique which is based on magnetiism produced in the human body. For what purpose is this technique used ? |
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| 6. |
The energy change that take place in a photovoltaic cell is |
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Answer» The energy change that take place in a photovoltaic cell is |
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| 7. |
How many 176 ohm resistors are required to carry 5A on 220V line |
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Answer» How many 176 ohm resistors are required to carry 5A on 220V line |
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| 8. |
What changes the shape of lens in the eye ? |
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Answer» What changes the shape of lens in the eye ? |
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| 9. |
Why doesn't stationary magnetic field induce current? |
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Answer» Why doesn't stationary magnetic field induce current? |
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| 10. |
Define the term power of a lens. In what unit is it expressed ? |
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Answer» Define the term power of a lens. In what unit is it expressed ? |
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| 11. |
the is inside a black hole or what is a black hole |
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Answer» the is inside a black hole or what is a black hole |
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| 12. |
What is the unit of refractive index ? |
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Answer» What is the unit of refractive index ? |
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| 13. |
Sun is the ultimate source of energy. How can we justify the same for energy stored in fossil fuels? |
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Answer» Sun is the ultimate source of energy. How can we justify the same for energy stored in fossil fuels? |
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| 14. |
A sherical mirror forms three times magnified Real image of an object placed in front of it. If the focus is situated at a distance of 9 cm from the pole, calculate how far the image is situated. What type of mirror is used? |
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Answer» A sherical mirror forms three times magnified Real image of an object placed in front of it. If the focus is situated at a distance of 9 cm from the pole, calculate how far the image is situated. What type of mirror is used? |
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| 15. |
A box of mass 2 kg is lifted diagonally from point A to point B as shown in the given figure. Given that the acceleration due to gravity is 10 ms−2, Then the gravitational potential energy gained by the box is ___ Joules. |
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Answer» A box of mass 2 kg is lifted diagonally from point A to point B as shown in the given figure. Given that the acceleration due to gravity is 10 ms−2, Then the gravitational potential energy gained by the box is |
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| 16. |
A ray of light falls on one face of an equilateral glass prism at 40∘ and emerges from the other face at the same angle. The deviation suffered by the ray is |
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Answer» A ray of light falls on one face of an equilateral glass prism at 40∘ and emerges from the other face at the same angle. The deviation suffered by the ray is |
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| 17. |
Choose the activity which falls under 'reduce' strategy? |
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Answer» Choose the activity which falls under 'reduce' strategy? |
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| 18. |
What is the amount of work to be done on a car of mass 1000 kg to increase its velocity from 10 km/hr to 20 km/hr? |
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Answer» What is the amount of work to be done on a car of mass 1000 kg to increase its velocity from 10 km/hr to 20 km/hr? |
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| 19. |
The order of screeening effect of electorns of s, p, d and f orbitals fo a given shell of an atom on its outer shell electrons is (a) s > P> d> f (b) f> d> p>s (c) p < d< s> f (d) f>p>s>d |
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Answer» The order of screeening effect of electorns of s, p, d and f orbitals fo a given shell of an atom on its outer shell electrons is |
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| 20. |
At what (i) voltage and (ii) frequency is the a.c supplied to our houses? |
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Answer» At what (i) voltage and (ii) frequency is the a.c supplied to our houses? |
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| 21. |
The diagram in figure shows the position of an object OA in relation to a convergin lens L whose foci are at F1 and F2. (i) Draw two rays to locate the position of image. (ii) State the position of image with reference to the lens. (iii) Describe three characteristics of the image. (iv) Describe how the distance of image from the lens and its size change as the object as the object is moved towards F1. |
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Answer» The diagram in figure shows the position of an object OA in relation to a convergin lens L whose foci are at F1 and F2.
(i) Draw two rays to locate the position of image. (ii) State the position of image with reference to the lens. (iii) Describe three characteristics of the image. (iv) Describe how the distance of image from the lens and its size change as the object as the object is moved towards F1. |
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| 22. |
Derive a relationship between mechanical advantage, velocity ratio and efficiency of a machine. |
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Answer» Derive a relationship between mechanical advantage, velocity ratio and efficiency of a machine. |
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| 23. |
State and define the S.I. unit of potential difference. |
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Answer» State and define the S.I. unit of potential difference. |
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| 24. |
_____ is used to take photographs of distant objects. |
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Answer» _____ is used to take photographs of distant objects. |
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| 25. |
A plane mirror is approaching you at 10 cm s−1. Your image shall approach you with a speed of |
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Answer» A plane mirror is approaching you at 10 cm s−1. Your image shall approach you with a speed of |
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| 26. |
How does the angle of minimum deviation produced by a prism change with an increase in the wavelength of incident light and the refracting angle of the prism? |
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Answer» How does the angle of minimum deviation produced by a prism change with an increase in the wavelength of incident light and the refracting angle of the prism? |
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| 27. |
The focal length of a symmetric biconvex lens is f. If we cut the lens into two equal pieces as shown below, the focal length of each piece will be ___. |
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Answer» The focal length of a symmetric biconvex lens is f. If we cut the lens into two equal pieces as shown below, the focal length of each piece will be ___. |
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| 28. |
What is optical density? |
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Answer» What is optical density? |
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| 29. |
Match the following: a.Doppler effect i. Measure distance, directionand speed of underwater object b. RADAR ii. Relative motion between thesource of sound and observerc.SONAR iii. Audible range up to 100 kHzd. Bats iv. Electromagnetic waves |
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Answer» Match the following: |
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| 30. |
Power of a convex lens of focal length 50 cm is |
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Answer» Power of a convex lens of focal length 50 cm is |
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| 31. |
Why are alloys commonly used in electrical heating devices give reasons? |
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Answer» Why are alloys commonly used in electrical heating devices give reasons? |
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| 32. |
State whether the following statement is true or false : The magnetic field inside a long circular coil carrying current will be parallel straight lines. |
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Answer» State whether the following statement is true or false : The magnetic field inside a long circular coil carrying current will be parallel straight lines. |
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| 33. |
Imagine a glass Concave lens placed in a liquid whose optical density is equal to that of the glass. Then what will be the nature of the lens? |
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Answer» Imagine a glass Concave lens placed in a liquid whose optical density is equal to that of the glass. Then what will be the nature of the lens? |
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| 34. |
One surface of a lens is convex and the other is concave. If the radii of curvature are r1 and r2 respectively, then the lens will be convex if |
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Answer» One surface of a lens is convex and the other is concave. If the radii of curvature are r1 and r2 respectively, then the lens will be convex if |
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| 35. |
From a spherical mirror, 3 separate concave mirrors are cut out and placed as shown. Find the total number of images of the sun that is formed by the setup. |
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Answer» From a spherical mirror, 3 separate concave mirrors are cut out and placed as shown. Find the total number of images of the sun that is formed by the setup.
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| 36. |
A student focused the image of a distant object using a device 'X' on a while screen 'S' as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device |
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Answer» A student focused the image of a distant object using a device 'X' on a while screen 'S' as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device
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| 37. |
A converging lens of focal length 10 cm produces a twofold magnified real image of an object placed perpendicular to the principal axis. Find the distance of the object from the lens. |
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Answer» A converging lens of focal length 10 cm produces a twofold magnified real image of an object placed perpendicular to the principal axis. Find the distance of the object from the lens.
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| 38. |
Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image. |
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Answer» Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image. |
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| 39. |
When travelling obliquely from one medium to another medium, the direction of propagation of light in the second medium? |
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Answer» When travelling obliquely from one medium to another medium, the direction of propagation of light in the second medium? |
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| 40. |
What length of copper wire of specific resistance 1.7×10−8Ω m and radius 1 mm is required so that its resistance is 1Ω |
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Answer» What length of copper wire of specific resistance 1.7×10−8Ω m and radius 1 mm is required so that its resistance is 1Ω |
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| 41. |
Draw a labelled diagram of a three pin socket. |
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Answer» Draw a labelled diagram of a three pin socket. |
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| 42. |
Consider a proton in a uniform magnetic field. Which of the following parameter changes while it moves freely in a uniform magnetic field? |
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Answer» Consider a proton in a uniform magnetic field. Which of the following parameter changes while it moves freely in a uniform magnetic field? |
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| 43. |
A ray of light is incident at 60°,on glass-air interface. Then the light ray will- |
| Answer» A ray of light is incident at 60°,on glass-air interface. Then the light ray will- | |
| 44. |
How many electrons are there in 1 Ampere of current? |
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Answer» How many electrons are there in 1 Ampere of current? |
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| 45. |
If 92X238 undergoes successively 8 α - decays and 6 β - decays, then resulting nucleus is |
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Answer» If 92X238 undergoes successively 8 α - decays and 6 β - decays, then resulting nucleus is |
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| 46. |
A ring of mass m and radius R and a sphere of mass M and same radius R are separated by a distance √8R as shown in the figure. The force of attraction between the ring and the sphere is |
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Answer» A ring of mass m and radius R and a sphere of mass M and same radius R are separated by a distance √8R as shown in the figure. The force of attraction between the ring and the sphere is |
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| 47. |
List the sign conventions for reflection of light by spherical mirrors. Draw a diagram and apply these conventions in the determination of focal length of a spherical mirror which forms a three times magnified real image of an object placed 16 cm in front of it. OR State the law of refraction of light that defines the refractive index of a medium with respect to the other. Express it mathematically. How is refractive index of any medium 'A' with respect to a medium 'B' related to the speed of propagation of light in two media A and B? State the name of this constant when one medium is vacuum or air. The refractive indices of glass and water with respect to vacuum are 32 and 43 respectively. If the speed of light in glass is 2×108m/s, find the speed of light in (i) vacuum, (ii) water. |
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Answer» List the sign conventions for reflection of light by spherical mirrors. Draw a diagram and apply these conventions in the determination of focal length of a spherical mirror which forms a three times magnified real image of an object placed 16 cm in front of it. |
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| 48. |
Calculate the amount of work done in shifting a charge of 2 coulombs from a point A to B having potential 10 V and 5 V respectively. |
| Answer» Calculate the amount of work done in shifting a charge of 2 coulombs from a point A to B having potential 10 V and 5 V respectively. | |
| 49. |
A body starts from rest at time t=0, accelerates uniformly and travels 320 m in 4 s. Find its velocity at time t=10s. |
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Answer» A body starts from rest at time t=0, accelerates uniformly and travels 320 m in 4 s. Find its velocity at time t=10s. |
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| 50. |
The focal length of a lens is +150 mm. What kind of lens is it and what is its power? |
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Answer» The focal length of a lens is +150 mm. What kind of lens is it and what is its power? |
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