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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. |
Raisins are wiped off gently before final weighing with help of |
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Answer» Raisins are wiped off gently before final weighing with help of |
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| 2. |
(a) What is meant by rainwater harvesting? Name some of the ancient structures used for rainwater harvesting by the rural people. (b) What are the various advantages of water stored in the ground? |
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Answer» (a) What is meant by rainwater harvesting? Name some of the ancient structures used for rainwater harvesting by the rural people. |
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| 3. |
A position dependent force F=7−2x+3x2 acts on a small body of mass 2 kg and displaces it from x = 0 to x = 5m. The work done in joules is |
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Answer» A position dependent force F=7−2x+3x2 acts on a small body of mass 2 kg and displaces it from x = 0 to x = 5m. The work done in joules is
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| 4. |
The standard units of conductivity or specific conductance [k] is Where S = Siemens cm = centimeter |
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Answer» The standard units of conductivity or specific conductance [k] is |
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| 5. |
Show with the help of diagrams how you would connect three resistors each of resistance 6 Ω so that the combination has a resistance of (i) 9 Ω (ii) 4 Ω |
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Answer» Show with the help of diagrams how you would connect three resistors each of resistance 6 Ω so that the combination has a resistance of (i) 9 Ω (ii) 4 Ω |
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| 6. |
A domestic lighting circuit has a fuse of 5 A . If the mains supply is at 230 V, calculate the maximum number of 36 W tube-lights that can be safely used in this circuit. |
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Answer» A domestic lighting circuit has a fuse of 5 A . If the mains supply is at 230 V, calculate the maximum number of 36 W tube-lights that can be safely used in this circuit. |
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| 7. |
There are four fuels which all contain only carbon and hydrogen. The fuel having highest calorific value will be one which has: (a) more of carbon but less of hydrgogn (b) less of carbon but more of hydrogen (c) equal proportions of carbon and hydrogen (d) less of carbon as well as less of hydrogen |
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Answer» There are four fuels which all contain only carbon and hydrogen. The fuel having highest calorific value will be one which has: |
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| 8. |
Which of the following is a heterogeneous mixture of decomposed plant material that is accumulated in water and in the absence of air? |
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Answer» Which of the following is a heterogeneous mixture of decomposed plant material that is accumulated in water and in the absence of air? |
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| 9. |
When would virtual image produced by convex lens ? Why doesn't virtual image drawn on a screen ? |
| Answer» When would virtual image produced by convex lens ? Why doesn't virtual image drawn on a screen ? | |
| 10. |
A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens (a) away from the screen (b) towards the screen (c) to a position very far away from the screen. (d) either towards or away from the screen depending upon the position of the object. |
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Answer» A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens (a) away from the screen (b) towards the screen (c) to a position very far away from the screen. (d) either towards or away from the screen depending upon the position of the object. |
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| 11. |
State the condition when the work done by a force is (a) positive, (b) negative. Explain with the help of examples. |
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Answer» State the condition when the work done by a force is (a) positive, (b) negative. Explain with the help of examples. |
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| 12. |
If the magnification has a negative sign, the image formed by the concave mirror must be |
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Answer» If the magnification has a negative sign, the image formed by the concave mirror must be |
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| 13. |
In a certain medical shop, the shopkeeper uses a strategy of using the pages of the old newspaper to make envelopes for medicine. Which of the 3 R strategies was implemented by him? |
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Answer» In a certain medical shop, the shopkeeper uses a strategy of using the pages of the old newspaper to make envelopes for medicine. Which of the 3 R strategies was implemented by him? |
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| 14. |
A force of 10N is being exerted by a ‘source’ on a given object. The object is seen to move with a velocity of 250cm/s. What is the power of the ‘source’? |
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Answer» A force of 10N is being exerted by a ‘source’ on a given object. The object is seen to move with a velocity of 250cm/s. What is the power of the ‘source’? |
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| 15. |
A sound wave has a frequency of ν Hz and a wavelength of λ m. Its velocity is: |
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Answer» A sound wave has a frequency of ν Hz and a wavelength of λ m. Its velocity is: |
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| 16. |
Which of the following causes the least pollution when burnt? |
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Answer» Which of the following causes the least pollution when burnt? |
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| 17. |
a current of 0.5 ampere is drawn by a filament of electricity bulb for 10 minutes. find the amount of electric charge that flows through the circuit |
| Answer» a current of 0.5 ampere is drawn by a filament of electricity bulb for 10 minutes. find the amount of electric charge that flows through the circuit | |
| 18. |
Hot spots are regions of high _______. |
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Answer» Hot spots are regions of high _______. |
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| 19. |
State giving reason how the speed of red light is compared with the speed of blue light in vacuum and in glass. |
| Answer» State giving reason how the speed of red light is compared with the speed of blue light in vacuum and in glass. | |
| 20. |
A convex lens of focal length 30cm produces a real image 3times magnified. Find the object distance. |
| Answer» A convex lens of focal length 30cm produces a real image 3times magnified. Find the object distance. | |
| 21. |
The atoms, molecules or ions that have absorbed radiation are said to be: |
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Answer» The atoms, molecules or ions that have absorbed radiation are said to be: |
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| 22. |
"A convex lens can form a magnified erect as well as magnified inverted image of an object placed in from of it." Draw ray diagram to justify this statement stating the position of the object with respect to the lens in each case. An object of height 4 cm is placed at a distance of 20 cm from a concave lens of focal length 10 cm. Use lens formula to determine the position of the image formed. |
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Answer» "A convex lens can form a magnified erect as well as magnified inverted image of an object placed in from of it." Draw ray diagram to justify this statement stating the position of the object with respect to the lens in each case. |
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| 23. |
A node is a point where there is always |
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Answer» A node is a point where there is always |
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| 24. |
A coin is placed at the bottom of a bowl and water is poured into it. The coin appears to be ________ due to _______. |
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Answer» A coin is placed at the bottom of a bowl and water is poured into it. The coin appears to be ________ due to _______. |
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| 25. |
Identify A and B in the following figure : |
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Answer» Identify A and B in the following figure :
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| 26. |
Which of the following correctly matches the hydrogen bomb and an atom bomb with the principle used in them? |
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Answer» Which of the following correctly matches the hydrogen bomb and an atom bomb with the principle used in them? |
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| 27. |
A solar cooker may not cook food if : (a) the solar cooker is not placed in the shade (b) the glass sheet cover of solar cooker is not closed (c) a convex mirror reflector is not used (d) the food containers of insulating material are not used |
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Answer» A solar cooker may not cook food if : (a) the solar cooker is not placed in the shade (b) the glass sheet cover of solar cooker is not closed (c) a convex mirror reflector is not used (d) the food containers of insulating material are not used |
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| 28. |
A tuning fork sounded together with a tuning fork of frequency 256 emits two beats. On loading the tuning fork of frequency 256, the number of beats heard are 1 per second. The frequency of tuning fork is [NCERT 1975, 81; MP PET 1985] |
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Answer» A tuning fork sounded together with a tuning fork of frequency 256 emits two beats. On loading the tuning fork of frequency 256, the number of beats heard are 1 per second. The frequency of tuning fork is [NCERT 1975, 81; MP PET 1985] |
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| 29. |
The longitudinal waves travel in a coiled spring at a rate of 4 m/s. The distance between two consecutive compressions is 20 cm. Find the frequency of the wave? |
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Answer» The longitudinal waves travel in a coiled spring at a rate of 4 m/s. The distance between two consecutive compressions is 20 cm. Find the frequency of the wave? |
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| 30. |
Find the correct match from the following |
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Answer» Find the correct match from the following |
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| 31. |
A beam of light is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the following figure :The box contains : (a) a glass prism (b) a concave lens (c) a convex lens (d) a parallel-sided glass slab |
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Answer» A beam of light is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the following figure :The box contains : (a) a glass prism (b) a concave lens (c) a convex lens (d) a parallel-sided glass slab
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| 32. |
If a light ray from the air enters 3 media in such a way that the refracted angles are 450, 300 and 600 respectively, then which is the densest medium among the three? In the figure, n1 represents refractive index of air. |
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Answer» If a light ray from the air enters 3 media in such a way that the refracted angles are 450, 300 and 600 respectively, then which is the densest medium among the three?
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| 33. |
Where is the image when you look at something in a mirror ? |
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Answer» Where is the image when you look at something in a mirror ? |
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| 34. |
What is the principle of fiber optical communication? |
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Answer» What is the principle of fiber optical communication? |
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| 35. |
When we enter a dark room with very little light, our vision is impaired for few seconds. Why? |
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Answer» When we enter a dark room with very little light, our vision is impaired for few seconds. Why? |
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| 36. |
What is the speed of γ−rays? Are they deflected by an electrostatic field? |
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Answer» What is the speed of γ−rays? Are they deflected by an electrostatic field? |
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| 37. |
What is the moment of force developed about the hinge of a door if a person tries to open it with a force of 100 N, the force being applied normal to the door at handle which is at a distance of 60 cm from the hinge? |
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Answer» What is the moment of force developed about the hinge of a door if a person tries to open it with a force of 100 N, the force being applied normal to the door at handle which is at a distance of 60 cm from the hinge? |
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| 38. |
A successful forest conversion plan should involve which of the following? |
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Answer» A successful forest conversion plan should involve which of the following? |
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| 39. |
How is the sign (+ or -) of power of a lens related to its divergent or convergent action ? |
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Answer» How is the sign (+ or -) of power of a lens related to its divergent or convergent action ? |
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| 40. |
Statement 1: Energy can neither be created nor destroyed. Statement 2: Energy cannot be converted from one form to another. |
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Answer» Statement 1: Energy can neither be created nor destroyed. |
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| 41. |
The minimum amount of heat energy required to emit an electron from a metal surface is called |
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Answer» The minimum amount of heat energy required to emit an electron from a metal surface is called |
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| 42. |
The source of ultraviolet light is : (a) electric bulb (b) red hot iron ball (c) sodium vapour lamp (d) Carbon arc - lamp. |
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Answer» The source of ultraviolet light is : (a) electric bulb (b) red hot iron ball (c) sodium vapour lamp (d) Carbon arc - lamp. |
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| 43. |
Question 15 A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g=10 m/s2, find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone? |
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Answer» Question 15 A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g=10 m/s2, find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone? |
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| 44. |
Ultrasound can be used for which of the following purpose/purposes? |
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Answer» Ultrasound can be used for which of the following purpose/purposes? |
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| 45. |
In the figure given below, a coil is placed between two permanent magnets and is rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represents two metallic brushes. G represents galvanometer. In the given setup, if the axle moves with constant speed the current through the arm AB and CD : |
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Answer» In the figure given below, a coil is placed between two permanent magnets and is rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represents two metallic brushes. G represents galvanometer.
In the given setup, if the axle moves with constant speed the current through the arm AB and CD : |
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| 46. |
The Fig. 12.4 shows a radioactive source in a thick lead container. The radiations pass through an electric field between the plates A and B. Complete the diagram to show the directions or paths of α−,β−and γ−radiations. [4 MARKS] |
Answer» The Fig. 12.4 shows a radioactive source in a thick lead container. The radiations pass through an electric field between the plates A and B. Complete the diagram to show the directions or paths of α−,β−and γ−radiations. [4 MARKS]
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| 47. |
What is the difference between a solenoid and an electromagnet? |
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Answer» What is the difference between a solenoid and an electromagnet? |
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| 48. |
A point source of light B is placed at a distance 'L' in front of the center of a mirror of width 'd' hung on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance '2L' from it as shown in the figure. The greatest distance over which he can see the image of the light source in the mirror is |
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Answer» A point source of light B is placed at a distance 'L' in front of the center of a mirror of width 'd' hung on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance '2L' from it as shown in the figure. The greatest distance over which he can see the image of the light source in the mirror is |
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| 49. |
An engine uses 720 KJ of energy in 2 hours. Calculate total electricity charges(in rupees) in two hours at a rate of 2.5 rupees per kWh?0.5 |
Answer» An engine uses 720 KJ of energy in 2 hours. Calculate total electricity charges(in rupees) in two hours at a rate of 2.5 rupees per kWh?
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| 50. |
Iodopsin is related to |
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Answer» Iodopsin is related to |
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