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

The Green House Effect is caused by an excess of ?

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

Bats can also fly in dark because they are capable of taking the help of _________?

A. Ultraviolet waves
B. Ultrasonic waves
C. Electromagnetic waves
D. Special retina

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 radar
C. A technology by which it is possible for the aircraft’s to spy in the enemy air-space
D. A technology by using which paratroopers can be dropped stealthily behind the enemy columns.

The primary function of the feathers in birds is to _________?

A. Provide insulation for preserving body heat
B. Provide striking surface to the wings for flying
C. Make the body surface waterproof
D. Impart coloration for species as well as sex recognition

The rear view mirror of a motor vehicle is ________?

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

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

A Fahrenheit thermometer indicates a temperature of ‘ 14°F. its corresponding reading on the Celsius scale will be _________?

A. – 2o°c
B. – 10°c
C. + 10°c
D. + 20°c

Which one of the following sets of color combinations is added in color vision in TV’?

A. Red, green and blue
B. Orange, back and violet
C. White. red and yellow
D. Yellow, green and blue

A train goes past a railway station at a high speed. A young boy standing on the edge of the platform is likely to __________?

A. Remain unaffected
B. Fall away from the train
C. Fall towards the train
D. Fall away from or towards the train depending upon the speed