GENERAL SCIENCE CLASS 8 MCQS

Rivet is used to fasten:

1. Soft material with soft material
2. Hard material with hard material
3. Soft material with hard material
4. Hard material with soft material

Bimetallic strip is used in:

1. Electric fan
2. Electric motor
3. Electric iron
4. Electric toaster

In mercury thermometer, mercury of bulb expands and rises in the tube which has linear scale:

1. -20°F - 100°F
2. 35°F - 105°F
3. 100°F - 120°F
4. 94°F - 108°F

In a mercury thermometer, what is the range of the linear scale that the mercury rises in the tube:

1. 35°C - 42°C
2. 20°C - 30°C
3. 50°C - 60°C
4. 80°C - 90°C

Which substance expands the most; for the same rise in temperature:

1. Water
2. Air
3. Copper
4. Class

An optic piece of curved transparent glass or plastic that refract the light in a specific way is called:

1. Prism
2. Filter
3. Lens
4. Mirror

The lens which refract the parallel rays of light are called:

1. Diverging Lens
2. Prim
3. Cylindrical Lens
4. Converging Lens

The lens which coverage a beam of parallel rays of light are called:

1. Diverging lens
2. Converging lens
3. Cylindrical lens
4. None

Concave lenses are also known as:

1. Converging Lens
2. Diverging Lens
3. Cylindrical lens
4. None

The point through which a ray of light passes without changing its path is the:

1. Focal Point
2. Principal Axis
3. Optical Centre
4. Centre of Curvature