Welcome to your Science Quiz 23
1.
Which of the following distance-time graph (x-t) represents one-dimensional uniform motion? [2001]
2.
Which one of the following does a TV remote control unit use to operate a TV set? [2000]
3.
A noise level of 100 decibels would correspond to: [2000]
4.
Consider the following features of newer models of motor cars: [2000]
I.Radial tyresÂ
II.Streamlined body
III. Multipoint fuel injectionÂ
IV.Catalytic converter with exhaustÂ
Which of these features make the newer models of motor cars more fuel-efficient?
5.
Fluorescent tubes are fitted with a choke. The choke coil: [2000]
6.
For reproducing sound, a CD (Compact Disc) audio player uses a: [2000]
7.
When a CD (Compact Disc) is seen in sunlight, rainbow-like colours are seen. This can be explained on the basis of the phenomenon of: [2000]
8.
Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling. [2000] Reason (R): If no external force acts on a system, its momentum cannot change.
Choose the correct option.
9.
Assertion (A): In a motion picture, usually 24 frames are projected every second over the whole length of the film. [2000] Reason (R): An image formed on the retina of the eye persists for about 0.1 s after the removal of stimulus.
Choose the correct option.
10.
Assertion (A): Small glass beads fixed on traffic signals glow brightly when light falls upon them. [2000] Reason (R): Light is totally reflected when the angle of incidence exceeds a certain critical v
Choose the correct option.
