A camera uses a____ to form an image.

a) convex lens

b) concave lens

c) condenser lens

d) none of these (more…)

The densest substance on the Earth is:

a) Platinum

b) Copper

c) Steel

d) Osmium (more…)

a) pascal

b) joule

c) tesla

Deficiency of vitamin-D results in:

a) night blindness

b) rickets

c) scurvy

d) hair fall (more…)

a) Oxygen

b) Hydrogen

c) Carbon Dioxide

d) Silicon (more…)

a) Oxygen

b) Hydrogen

c) Carbon Dioxide

d) Silicon (more…)