Assertion (A) : A man standing on a completely frictionless surface can propel himself by whistling. Reason (R) : If no external force acts on a system, its momentum cannot change.
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Assertion (A) : In a motion picture, usually 24 frames are projected every second over the whole length of the film. Reason (R) : An image formed on the retina of eye persists for about 0.1 s after the removal of stimulus.
Assertion (A) : In a motion picture, usually 24 frames are projected every second over the whole length of the film. Reason (R) : An image formed on the retina of eye persists for about 0.1 s after the removal of stimulus.
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When a CD (Compact Disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of
When a CD (Compact Disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of
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For reproducing sound, a CD (Compact Disc) audio player uses a
For reproducing sound, a CD (Compact Disc) audio player uses a
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The memory of a computer is commonly expressed in terms of Kilobytes or Megabytes. A byte is made up of
The memory of a computer is commonly expressed in terms of Kilobytes or Megabytes. A byte is made up of
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Consider the following features of newer models of motor cars : I. Radial tyres II. Streamlined body III. Multipoint fuel injection IV. Catalytic converter with exhaust Which of these features make the newer models of motor cars more fuel efficient
Consider the following features of newer models of motor cars : I. Radial tyres II. Streamlined body III. Multipoint fuel injection IV. Catalytic converter with exhaust Which of these features make the newer models of motor cars more fuel efficient ?
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Fluorescent tubes are fitted with a choke. The choke coil
Fluorescent tubes are fitted with a choke. The choke coil
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A noise level of 100 decibels would correspond to
A noise level of 100 decibels would correspond to
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A ‘black hole’ is a body in space which does not allow any radiation to come out. This property is due to its
A ‘black hole’ is a body in space which does not allow any radiation to come out. This property is due to its
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Which one of the following does a TV remote control unit use to operate a TV set
Which one of the following does a TV remote control unit use to operate a TV set ?