Short-sight defect could be corrected by a _____________ lens?

A. Concave lens
B. Convex lens
C. Converging lens
D. None of these

The inner most part of the earth is__________?

A. Crust
B. Mental
C. Core
D. None of these

The ozone layer is at height of________kilometers from the surface of the Earth?

A. 10 to 20
B. 20 to 30
C. 30 to 40
D. 40 to 50

A Little inhalation is done through________?

A. Cigarettes
B. Pipes and cigars
C. Both a and b offer little inhalation
D. Both offer extreme inhalation

The human brain uses__________ percent of the total oxygen and blood in the body?

A. 20
B. 12
C. 35
D. 48

Water is heated in a kettlE. The inside water is heated by convection. A person sitting near the fire receives heat by ________?

A. Conduction
B. Convection
C. Radiation
D. Reflection

Which of the following planets have the longest day?

A. Jupiter
B. Mercury
C. Earth
D. Venus

which of the following planets is known as “morning star”?

A. Mercury
B. Venus
C. Mars
D. Saturn

Which of the following have maximum calorific value?

A. Carbohydrates
B. Fats
C. Proteins
D. Vitamins

At what angle above the horizon must the sun be to create a rainbow?

A. 90 degrees
B. 60 degrees
C. 40 degrees
D. 65 degrees