1) The most important stimulant in tea leaves is
(A) Brucine
(B) Caffeine
(C) Phenylalanine
(D) None of these
2) Dolly is the name of the
(A) First cloned sheep
(B) First cloned monkey
(C) First test-tube baby
(D) First human fossil
3) Which part of the camera is analogue to the retina in the human eye?
(A) Lens
(B) Film
(C) Aperture
(D) Shutter
4) When a person enters a dark room from bright light he is not able to see clearly for a little while because the
(A) Eye is unable to adjust itself immediately
(B) Retina becomes insensitive momentarily
(C) Iris is unable to dilate the pupil immediately
(D) Distance between the lens and retina take time to adjust
5) What is the average adult pulse rate?
(A) 140-150
(B 115-125
(C) 72-80
(D) 60
6) The beautiful colour patterns exhibited by a peacock in its tail feathers are due to
(A) Selective absorption of light
(B) Selective reflection of light
(C) Interference of light
(D) Natural colour pattern of feathers
7) A lake starts freezing because of the cold atmosphere. It will first freeze
(A) At the bottom
(B) In the middle part
(C) At the top surface
(D) Uniformly throughout the water body
8) The sun appears red at sunrise and sunset while it appears white at noon, because
(A) Refraction
(B) It is cooler at sunrise and at sunset
(C) Of diffraction leading to red end of the spectrum reaching the earth
(D) Of scattering of light due to dust particles and air molecules
9) An astronaut inside a spacecraft is in a state of weightlessness. This implies that
(A) The mass of the astronaut is reduced to zero
(B) Gravity inside the spacecraft ceases to act
(C) The astronaut is outside the influence of the earth's gravitational force
(D) The astronaut and the spacecraft are both in a free-falling state
10) An iceberg is floating in sea. How much of its mass will remain above the surface of water?
(A) One tenth
(B) One fifth
(C) One fourth
(D) One third