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Science Quiz 23

author October 4, 2025 No Comments PYQ Quiz

Welcome to your Science Quiz 23

1. 

Which of the following distance-time graph (x-t) represents one-dimensional uniform motion? [2001]

Not Attempted

None

2. 

Which one of the following does a TV remote control unit use to operate a TV set? [2000]

Light waves

Sound waves

Microwaves

Radio waves

Not Attempted

None

3. 

A noise level of 100 decibels would correspond to: [2000]

Just audible sound

Ordinary conversation

Sound from a noisy street

Noise from a machine-shop

Not Attempted

None

4. 

Consider the following features of newer models of motor cars: [2000]

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?

I and II

II and III

II, III and IV

I, III and IV

I, III and IV

None

5. 

Fluorescent tubes are fitted with a choke. The choke coil: [2000]

Steps up the line voltage

Steps down the line voltage

Reduces current in the circuit

Chokes low-frequency currents

Not Attempted

None

6. 

For reproducing sound, a CD (Compact Disc) audio player uses a: [2000]

Quartz crystal

Laser beam

Barium titanate ceramic

Not Attempted

None

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]

Reflection and diffraction

Reflection and transmission

Diffraction and transmission

Refraction, diffraction and transmission

Not Attempted

None

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.

Both A and R are true, and R is the correct explanation of A

Both A and R are true, and R is the correct explanation of A

A is true, but R is false

A is false, but R is true

Not Attempted

None

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.

Both A and R are true, and R is the correct explanation of A

Both A and R are true, but R is not a correct explanation of A

A is true, but R is false

A is false, but R is true

Not Attempted

None

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.

Both A and R are true, and R is the correct explanation of A

Both A and R are true, but R is not a correct explanation of A

A is true, but R is false

A is false, but R is true

Not Attempted

None

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