What method of energy transfer requires no medium for transfer?

A. Radiation
B. Convection
C. Conduction
D. A and b both

In general, good absorbents of electromagnetic radiation are also good___________?

A. Radiators
B. Conductors
C. Insulators
D. Semi conductors

During which process of energy exchange does cold air displace warmer air?

A. Convection
B.  radiation
C.  conduction
D.  none of these

Which of the following arguments for trade barriers offers potential benefits to consumers?

A. To soften the fall of declining industries.
B. To protect industries from competition from low wage countries.
C. To protect industries from dumping.
D. To nurture infant industries by protecting them from cheaper imports.

The S. I. unit of refractive index is _______?

A. Meter
B. Cm
C. Watt
D. No unit

Soil acidity is corrected by?

A. Proper irrigation
B. Adding sodium hydroxide
C. Liming
D. Application of fertilizers

Endothermic reactions are those in which ________.

A. Heat is evolved
B. Heat is absorbed
C. Temperature increases
D. Light is produced

Which colour of light is deviated least ________.

A. Red
B. Blue
C. Violet
D. Green

Fisher unit is used to measure?

A. Protein content
B. Flour color
C. Damaged starch
D. Flour particle size

What is the rank of the earth in the solar system in terms of size?

A. 5th
B. 4th
C. 3rd
D. None of these