Uneven surfaces show ………………….. Reflection. (a)regular (b)irregular (c)specular (d)zero

Which of the following is a measure of solar radiation energy received on a given surface area in a given time (a) Radiation (b) Reflection (c) Insolation (d) Refraction

(a) What is meant by 'reflection of sound'? What type of surfaces are the best for reflecting sound? (b) Name any two objects which are good reflectors of sound. (c) State the laws of reflection of sound.

Distribution of rain in Mediterranean region is (a) Erratic (b) Irregular (c) Even (d) Uneven

How many zeros will be there in 17 crore? (a)5 zeros (b)6 zeros (c)7 zeros (d)8 zeros

Distinguish between (a) Simple epithelium and compound epithelium. (b) Cardiac muscle and striated muscle (c) Dense regular and dense irregular connective tissues (d) Adipose and blood tissue (e) Simple gland and compound gland

The force of friction between two surfaces will increase if (A) a layer of lubricant is kept between the two surfaces. (B) the two surfaces are pressed harder. (C) air gap is created between the two surfaces. (D)irregularities on both the surfaces are removed.