1031. The most important stimulant in tea leaves is _________.
A. Brucine
B. Caffeine *
C. Phenylalanine
D. Theine
1032. Dolly is the name of the _____________.
A. First Cloned sheep *
B. First cloned monkey
C. First test-tube baby
D. First human fossil
1033. Which part of the camera is analogue to the retina in the human eye?
A. Lens
B. Film *
C. Aperture
D. Shutter
1034. When a person enters a dark room from bright light he is not able to see clearly from 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
1035. What is the average adult pulse rate ?
A. 140-150 BPM
B. 115-125 BPM
C. 72- 80 BPM
D. 60-100 BPM *
1036. The beautiful colour pattern exhibited by a peacock in its tail feathers are due to ________.
A. Selective absorption of light *
B. Selective reflection of light
C. Sinterference of light
D. Natural colour patter of feathers
1037. 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 .
1038. The sun appears red at sunrise and sunset while it apperas white at noon, because ________.
A. Of 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 *
1039. An astronaut inside a space craft 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
1040. 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