The Sun is a __________?

A. Star
B. Planet
C. Asteroid
D. Meteor

The gas used in a refrigerator to cool water is___________?

A. Nitrogen
B. Carbon dioxide
C. Methane
D. Tetrafluoroethane

The average adult has a blood volume of about __________ liters.

A. 4
B. 5
C. 6
D. 7

The most abundant element in the universe is __________.

A. Oxygen
B. Hydrogen
C. Carbon Dioxide
D. Silicon

The most abundant element in the Earth’s crust is __________?

A. Oxygen
B. Hydrogen
C. Carbon Dioxide
D. Silicon

Each day human body breathe in __________ liters of air.

A. 5,000 to 10,000
B. 10,000 to 15,000
C. 15,000 to 20,000
D. 20,000 to 25,000

Deficiency of Vitamin-D results in __________?

A. night blindness
B. rickets
C. scurvy
D. hair fall

The SI unit of “pressure” is _________.

A. pascal
B. joule
C. tesla
D. henry

The most densest substance on the Earth is __________.

A. Platinum
B. Copper
C. Steel
D. Osmium

A camera uses a __________ to form an image.

A. convex lens
B. concave lens
C. condenser lens
D. none of these