1041. Most of the ozone in the atmosphere is concentrated in the ________.

A. Mesosphere
B. Troposphere
C. Stratosphere *
D. Ionosphere

1042. The cow’s milk contains how much amount of water in terms of percentage ?

A. 60%
B. 65%
C. 72%
D. 87% *

1043. T.V. transmission cannot cover a very large area because __________.

A. The strength of T.V. waves is very limited
B. Picture cannot be transmitted clearly after a specific distance
C. The shape of the earth is spherical *
D. The air is not a good conductor of light and sound waves *

1044. The green house effect is caused by an excess of __________.

A. Carbon dioxide *
B. Carbon monoxide
C. Carbon tetrachloride
D. None of the above

1045. Bats can also fly in dark because they are capable f taking the help of _____________.

A. Ultraviolet Waves
B. Ultrasonic Waves *
C. Electromagnetic Waves
D. Special Retina

1046. What is ” stealth Technology ?

A. A device which when attached to an aircraft makes it invisible on the radar.
B. A coating which reduces the visibility of an aircraft on a radar *
C. A technology by which it is possible for the aircraft on a radar .
D. A technology by using which paratroopers can be dropped stealthily behind the enemy columns.

1047. The primary function of the feathers in birds is to ___________.

A. The primary function of the feathers in birds is to ___________.
B. Provide striking surface to the wings for flying. *
C. make the body surface water proof
D. All of the above

1048. The rear view mirror of a motor vehicle is ____________.

A. Concave
B. Plane
C. Convex *
D. Biconcave

1049. Lead ball falls through water more slowly than through air because ___________.

A. The value of ‘g’ is less in water
B. Density of air is less than that of water
C. Of the viscous force in water *
D. Of the surface tension of water

1050. A Fahrenheit thermometer indicates a temperature of 14 degree fahrenheit .Its corresponding reading on the Celsius scale will be _________.

A. -20 degree celcius
B. -10 degree Celsius *
C. +10 degree celcius
D. +20 degree Celsius