TEST No. 2
The weight of an object is 45 N. What will be its weight on the Moon?
A. 45 N
B. 6.5 N
C. 0
D. 7.5 N
Why do street ice cream vendors remove the water in their freezing mixture intermittently?
A. To increase the temperature of the freezing mixture.
B. To maintain the temperature of the freezing mixture as constant.
C. To reduce the temperature of the freezing mixture.
D. To reduce the weight of the freezing mixture.
Which of the following component of air turns silver articles black?
A. Moisture
B. Carbon
C. Hydrogen
D. Hydrogen Sulphide
One student is doing experiment to draw the path of light rays passing through a glass slab. For this, he measured the angle of refraction and angle of emergence for every angle of incidence. What would be his observation in all the cases?
A. The angle of incidence is larger than the angle of refraction, but is almost equal to the angle of emergence.
B. The angle of incidence is smaller than the angle of refraction, but it is almost equal to the angle of emergence.
C. The angle of incidence is larger than the angle of emergence.
D. The angle of incidence is smaller than the angle of refraction, and it is also smaller than the angle of emergence.
Which of the following change is observed on dipping a litmus paper in aqueous solution of MgO?
A. Blue litmus turns red: therefore MgO is acidic.
B. No colour change in litmus paper; therefore, MgO is neutral.
C. Red litmus turns blue; therefore, MgO is alkaline.
D. Litmus paper is decolourised; therefore, MgO acts as bleaching agent.
