Question

1. The shape of a shadow depends on which of the following?
A. Shape of the opaque object
B. Colour of the screen
C. Colour of the object
D. Light travelling in straight line
Give reason:

2. A wooden stick partly submerged obliquely in water appears to be bent at a point where it enters the water surface. Which one of the following gives explanation for this observation?
A. dispersion of light on entering water
B. light travels in straight line in water
C. diffraction of light by the surface of water
D. refraction of light due to differences in speed of light in air.
Give reason:

3. 100 grams of a gas in a steel cylinder is heated from 700C to 2000C. Which response best describes what will happen to the gas pressure?
A. The pressure will decrease
B. The pressure will remain constant
C. The pressure will increase
D. No effect will be observed in the behavior of the gas particles.
Give reason:

4. Which of the following is not a characteristic of liquids?
A. Liquids take up the shape of the container they are poured into
B. The particles of liquids are arranged in a regular pattern.
C. The particles of liquid are closer together than the particles of gases.
D. The particles of liquid have more space between them than particles of solid do.
Give reason:

5. What is the average speed of a car that travels a distance of 10 km in 30 min?
A. 20 km/h
B. 30 km/h
C. 40 km/h
D. 50 km/h.
Give reason:

Answer 1

Answer:

4. liquid particles are not arranged in regular manner

Answer 2

Answer:

1. shape of. the opaque object