Water is a highly effective coolant for a car engine because _____.

1. 1. Water has very high specific heat capacity
   2. Water is good conductor of heat
   3. Water boils at a comparatively high temperature
   4. Evaporation of water produces lot of cooling

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

1. 1. Remain unaffected
   2. Fall away from the train
   3. Fall towards the train
   4. Fall away from or towards the train depending upon the speed

Which of the following sets of colour combinations is added in colour vision in TV?

1. 1. Red, Green and Blue
   2. Orange, Black and Violet
   3. White, Red and Yellow
   4. Yellow, Green and Blue

A Fahrenheit thermometer indicates a temperature of 14°F. Its corresponding reading on the Celsius scale will be _____.

1. 1. – 20°C
   2. – 10°C
   3. + 10°C
   4. + 20°C

Lead pencil falls through water more slowly than through air because _____.

1. 1. The value of ‘g’ is less in water
   2. Density of air is less than that of water
   3. Of the viscous force in water
   4. Of the surface tension of water

The rear view mirror of a motor vehicle is _____.

1. 1. Concave
   2. Convex
   3. Plane
   4. Biconcave

The primary function of the feathers in birds is to _____.

1. 1. Provide striking surface to the wings for flying
   2. Provide insulation for preserving body heat
   3. Make the body surface waterproof
   4. Impart colouration for species as well as sex recognition

What is ‘Stealth Technology’?

1. 1. A device which when attached to an aircraft makes it invisible on the radar
   2. A technology by which it is possible for the aircrafts to spy in the enemy air-space
   3. A coating which reduces the visibility of an aircraft on a radar
   4. A technology by using which paratroopers can be dropped stealthily behind the enemy columns

Bats can also fly in dark because they are capable of taking the help of _____.

1. 1. Ultraviolet Waves
   2. Ultrasonic Waves
   3. Electromagnetic Waves
   4. Special Retina

The Green House Effect is caused by an excess of _____.

1. 1. Carbon dioxide
   2. Carbon monoxide
   3. Carbon tetrachloride
   4. None of the above