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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. |
Question 2 The radius of curvature of a spherical mirror is 20 cm. What is its focal length? |
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Answer» Question 2 |
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| 2. |
Write the approximate value of specific latent heat of ice. |
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Answer» Write the approximate value of specific latent heat of ice. |
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| 3. |
How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container (given that aμw=43 |
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Answer» How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container (given that aμw=43 |
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| 4. |
The major programme started to replenish the damaged forests is called: (a) horticulture (b) tissue culture (c) agriculture (d) silviculture |
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Answer» The major programme started to replenish the damaged forests is called: |
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| 5. |
A real image of an object is to be obtained. The mirror required for this purpose is : (a) convex (b) concave (c) plane (d) either convex or concave |
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Answer» A real image of an object is to be obtained. The mirror required for this purpose is : (a) convex (b) concave (c) plane (d) either convex or concave |
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| 6. |
The input power to a machine is 1500 W and its efficiency is 80%. Then, the output power by the machine is : |
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Answer» The input power to a machine is 1500 W and its efficiency is 80%. Then, the output power by the machine is : |
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| 7. |
Question 9 Among the statements given below select the ones that correctly describe the concept of sustainable development (i) Planned growth with minimum damage to the environment (ii) Growth irrespective of the extent of damage caused to the environment (iii) Stopping all developmental work to conserve the environment (iv) Growth that is acceptable to all the stakeholders. (a) (i) and (iv) (b) (ii) and (iii) (c) (ii) and (iv) (d) (iii) only |
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Answer» Question 9 Among the statements given below select the ones that correctly describe the concept of sustainable development (i) Planned growth with minimum damage to the environment (ii) Growth irrespective of the extent of damage caused to the environment (iii) Stopping all developmental work to conserve the environment (iv) Growth that is acceptable to all the stakeholders. (a) (i) and (iv) (b) (ii) and (iii) (c) (ii) and (iv) (d) (iii) only |
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| 8. |
Give two uses of a convex mirror. Explain why you would choose convex mirror for these uses. |
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Answer» Give two uses of a convex mirror. Explain why you would choose convex mirror for these uses. |
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| 9. |
We have an electric kettle rated at (60v, 5A). We have a mass of 10 kg that is placed such that the steam in the kettle is used to drive the mass in the Horizontal direction. What is the velocity of mass attained? If kettle is running for 5 min. |
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Answer» We have an electric kettle rated at (60v, 5A). We have a mass of 10 kg that is placed such that the steam in the kettle is used to drive the mass in the Horizontal direction. What is the velocity of mass attained? If kettle is running for 5 min. |
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| 10. |
A person runs with a speed u towards a bicycle moving away from him at the speed v. The person approaches his image in the plane mirror fixed at the rear of the bicycle with a speed of: |
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Answer» A person runs with a speed u towards a bicycle moving away from him at the speed v. The person approaches his image in the plane mirror fixed at the rear of the bicycle with a speed of: |
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| 11. |
The diode used in the circuit shown in fig. has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatt. What should be the value of the resistor R, connected in series with the diode, for obtaining maximum current? |
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Answer» The diode used in the circuit shown in fig. has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatt. What should be the value of the resistor R, connected in series with the diode, for obtaining maximum current?
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| 12. |
One end of a thin uniform rod of length L and mass M1 is rivetted to the centre of a uniform circular disc of radius r and mass M2, so that both are coplanar. The distance of centre of mass of the combination from the centre of the disc is |
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Answer» One end of a thin uniform rod of length L and mass M1 is rivetted to the centre of a uniform circular disc of radius r and mass M2, so that both are coplanar. The distance of centre of mass of the combination from the centre of the disc is |
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| 13. |
The volume occupied by 10 g of Oxygen at 0o C and 2 atm pressure will be approximately______. |
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Answer» The volume occupied by 10 g of Oxygen at 0o C and 2 atm pressure will be approximately______. |
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| 14. |
A potential difference of Volts is applied across the ends of a resistance of ohms. What current will flow in the resistance? |
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Answer» A potential difference of Volts is applied across the ends of a resistance of ohms. What current will flow in the resistance? |
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| 15. |
Question 1 A 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 A 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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| 16. |
Mention one difference between the reflection of light from a plane mirror and total internal reflection of light from a prism. |
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Answer» Mention one difference between the reflection of light from a plane mirror and total internal reflection of light from a prism. |
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| 17. |
What type of reflector is used in a box-type solar cooker? |
| Answer» What type of reflector is used in a box-type solar cooker? | |
| 18. |
The diagram in Fig. 7.13 shows the displacement-time graph of a vibrating body. (i) Name the kind of vibrations. (ii) Give one example of such vibrations. (iii) Why is the amplitude of vibrations gradually decreasing ? (iv) What happens to the vibrations of the body after some time ? |
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Answer» The diagram in Fig. 7.13 shows the displacement-time graph of a vibrating body.
(i) Name the kind of vibrations. (ii) Give one example of such vibrations. (iii) Why is the amplitude of vibrations gradually decreasing ? (iv) What happens to the vibrations of the body after some time ? |
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| 19. |
Complete the following sentences : (a) If half of a convex lens is covered, the focal length ..................... change, but the intersity of image ...................... (b) A convex lens is placed in water. Its focal length will .................. (c) The focal length of a thin convex lens is ............... than that of a thick convex lens. |
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Answer» Complete the following sentences : (a) If half of a convex lens is covered, the focal length ..................... change, but the intersity of image ...................... (b) A convex lens is placed in water. Its focal length will .................. (c) The focal length of a thin convex lens is ............... than that of a thick convex lens. |
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| 20. |
Question 18 (d) Explain: (d) How does the resistance of a wire vary with its area of cross-section? |
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Answer» Question 18 (d) Explain: (d) How does the resistance of a wire vary with its area of cross-section? |
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| 21. |
Which of the following depiction is correct. |
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Answer» Which of the following depiction is correct. |
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| 22. |
An electric bulb is rated 220V and 100W. When it is operated on 110V, the power consumed will be- a) 25W b) 50W c) 75W d) 100W |
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Answer» An electric bulb is rated 220V and 100W. When it is operated on 110V, the power consumed will be- a) 25W b) 50W c) 75W d) 100W |
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| 23. |
What is the cause of atmospheric refraction? |
| Answer» What is the cause of atmospheric refraction? | |
| 24. |
What is the difference between focus and principal focus. |
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Answer» What is the difference between focus and principal focus. |
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| 25. |
Choose the correct staement(s) from the following options. |
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Answer» Choose the correct staement(s) from the following options. |
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| 26. |
An object 50 cm tall is placed on the principal axis of a concave lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens |
| Answer» An object 50 cm tall is placed on the principal axis of a concave lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens | |
| 27. |
If we touch 5-10 volt wire we will not get shock...????? |
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Answer» If we touch 5-10 volt wire we will not get shock...????? |
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| 28. |
A potential difference of 40 V is applied across a resistance of 8 ohm for a period of 2 minutes . Calculate the charge which passes through the resistor. |
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Answer» A potential difference of 40 V is applied across a resistance of 8 ohm for a period of 2 minutes . Calculate the charge which passes through the resistor. |
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| 29. |
Three resistors each having same resistance are connected in parallel. Their equivalent resistance is 1. If they are connected in series, their equivalent resistance will be: |
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Answer» Three resistors each having same resistance are connected in parallel. Their equivalent resistance is 1. If they are connected in series, their equivalent resistance will be: |
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| 30. |
A 2 cm long pin is placed perpendicular to the principal axis of a lens of focal length 15 cm at distance of 25 cm from the lens. Find the size of the image. |
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Answer» A 2 cm long pin is placed perpendicular to the principal axis of a lens of focal length 15 cm at distance of 25 cm from the lens. Find the size of the image. |
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| 31. |
Question 18 (e) Explain: (e) Why are copper and aluminum wires usually employed for electricity transmission? |
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Answer» Question 18 (e) Explain: (e) Why are copper and aluminum wires usually employed for electricity transmission? |
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| 32. |
A person walking in a dark corridor enters into a brightly lit room : (a) State the effect on the pupil of the eye. (b) How does this affect the amount of light entering the eye ? |
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Answer» A person walking in a dark corridor enters into a brightly lit room : (a) State the effect on the pupil of the eye. (b) How does this affect the amount of light entering the eye ? |
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| 33. |
The energy that resides in a current carrying inductor is in the form of a ___ |
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Answer» The energy that resides in a current carrying inductor is in the form of a ___ |
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| 34. |
Question 8 Why is a normal eye not able to see clearly the objects placed closer than 25 cm? |
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Answer» Question 8 Why is a normal eye not able to see clearly the objects placed closer than 25 cm? |
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| 35. |
Name any two electromagnetic waves which have a frequency higher than that of violet light. |
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Answer» Name any two electromagnetic waves which have a frequency higher than that of violet light. |
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| 36. |
If the magnification produced by a lens is -0.5, the correct statement is : (a) the lens is concave (b) the image is virtual (c) the image is magnified (d) the image is real and diminshed formed by a convex lens |
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Answer» If the magnification produced by a lens is -0.5, the correct statement is : (a) the lens is concave (b) the image is virtual (c) the image is magnified (d) the image is real and diminshed formed by a convex lens |
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| 37. |
Type of rectifier used in figure is |
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Answer» Type of rectifier used in figure is |
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| 38. |
1 kg piece of copper is drawn into a wire of cross-sectional area 1 mm2, and then the same wire is remoulded again into a wire of cross-sectional area 2 mm2. Find the ratio of the resistance of the first wire to the second wire. |
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Answer» 1 kg piece of copper is drawn into a wire of cross-sectional area 1 mm 2 , and then the same wire is remoulded again into a wire of cross-sectional area 2 mm 2 . Find the ratio of the resistance of the first wire to the second wire. |
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| 39. |
The energy conversion taking place in a DC Motor and an AC Generator respectively are: |
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Answer» The energy conversion taking place in a DC Motor and an AC Generator respectively are: |
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| 40. |
Two exactly similar heating resistance are connected (i) in series , and (ii) in parallel, in two different circuits, one by one. If the same current is passed through both the combination, is more heat obtained per minute when they are connected in series or when they are connected in parallel? Give reason for your answer. |
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Answer» Two exactly similar heating resistance are connected (i) in series , and (ii) in parallel, in two different circuits, one by one. If the same current is passed through both the combination, is more heat obtained per minute when they are connected in series or when they are connected in parallel? Give reason for your answer. |
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| 41. |
A ray of light is incident at the glass–water interface at an angle i, if it emerges finally parallel to the surface of the water, then the value of μg would be |
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Answer» A ray of light is incident at the glass–water interface at an angle i, if it emerges finally parallel to the surface of the water, then the value of μg would be |
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| 42. |
What do you understand by an ideal machine ? How does it differ from a pratical machine ? |
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Answer» What do you understand by an ideal machine ? How does it differ from a pratical machine ? |
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| 43. |
Why couldn't the mysterious rays coming out of Beryllium foil in Chadwick's experiment on being hit by alpha particles have been gamma rays? |
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Answer»
Why couldn't the mysterious rays coming out of Beryllium foil in Chadwick's experiment on being hit by alpha particles have been gamma rays? |
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| 44. |
Give some uses of UV rays. |
| Answer» Give some uses of UV rays. | |
| 45. |
A block of ice at -10∘C is slowly heated and converted to steam at 100∘C. Which of the following curves represents the phenomenon qualitatively? |
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Answer» A block of ice at -10∘C is slowly heated and converted to steam at 100∘C. Which of the following curves represents the phenomenon qualitatively? |
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| 46. |
Now Tony, realizing his folly, decides to aim for an efficiency of 1. This is not possible too, because it violates: |
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Answer» Now Tony, realizing his folly, decides to aim for an efficiency of 1. This is not possible too, because it violates: |
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| 47. |
How are electric charges produced by friction? |
| Answer» How are electric charges produced by friction? | |
| 48. |
An electron is fixed at the origin as shown. What is the electric field at A? |
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Answer» An electron is fixed at the origin as shown. What is the electric field at A?
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| 49. |
Out of 40W and 60W which one have higher electrical resistance amd why? |
| Answer» Out of 40W and 60W which one have higher electrical resistance amd why? | |
| 50. |
Does the current flowing in the main circuit have the same magnitude as the current flowing through resistor in parallel circuit justify your answer what can you say about potential difference in the circuit |
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Answer» Does the current flowing in the main circuit have the same magnitude as the current flowing through resistor in parallel circuit justify your answer what can you say about potential difference in the circuit |
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