11 A radio station broadcasts at 30 meter band. The frequency of electromagnetic waves transmitted from this station could be
10 MHz
12 An iron ball and a wooden ball of the same radius are released from the same height in vacuum. The time taken by both the balls to reach the ground are
Exactly equal
13 Man’s chief competitors for available food supply are
Insects
14 Hawks are valuable because they
Destroy mice
15 In some leaves the outer most layer secrets a continuous waxy layer called
Cutical
16 In leaves the outermost layer is called
Epidermis
17 A photoelectric cell converts
Light energy into electric energy
18 The image formed on the retina of the eye is
Real and inverted
19 Vampire bats are the bats that eat
Blood
20 In a honeybee colony, what category of bee is the drone?
A male bee, non-working
