A tight-rope walker carries a long pole which he holds across his body. The purpose of this pole is to__________?

A. Prop him up if he falls
B. Spread out his weight and reduce the pressure on the rope
C. Add extra weight to keep the rope tightly stretched
D. To keep the center of gravity always above vertically above the rope

When water is filled in a bottle and is allowed to freeze, the bottle breaks because

A. Water expands on freezing
B. Bottle contracts at freezing point
C. Temperature outside the bottle is less than that inside the bottle.
D. None of the above

People living in high altitudes (like mountains) usually have a _________?

A. Smaller number of red blood cells
B. Larger number of red blood cells
C. Smaller number of white blood cells
D. Larger number of white blood cells

Copper is used in the production of___________?

A. Brick kilns
B. Children toys
C. Kitchen utilities
D. Electric wires

The blue colour of clear sky is due to_______________?

A. Reflection of light
B. Refraction of light
C. Diffraction of light
D. Dispersion of light

A device which converts chemical energy into electrical energy is called __________?

A. Motor
B. Generator
C. Moving-coil meter
D. Battery

Which of the following helps in clotting of blood?

A. Vitamin b1
B. Vitamin b2
C. Vitamin d
D. Vitamin k

How many bones are there in an adult human being?

A. 210
B. 260
C. 206
D. 300

In humans , most nutrient molecules are absorbed by the ?

A. Small intestine
B. Stomach
C. Liver
D. Large intestine

The planets visible to us without using a telescope are __________?

A. 3
B. 4
C. 5
D. 6