In the composition of earth, Oxygen is approximately _____.

1. 1. 40%
   2. 46%
   3. 56%
   4. 58%

Velocity of sound in air per second is _____.

1. 1. 331 meters
   2. 435 meters
   3. 250 meters
   4. 500 meters

Deficiency of Vitamin C in human body leads to _____.

1. 1. Teeth disease
   2. Eye disease
   3. Nerve disease
   4. Skin disease

Angiography and Angioplasty mean _____.

1. 1. One single process
   2. Plastic surgery
   3. Diagnosis of diabetes
   4. Two different but inter-related processes

A drone can be traced by _____.

1. 1. Laser
   2. Radar
   3. Lap top
   4. Ultrasound waves

Heat of sun-rays to earth is reduced by _____.

1. 1. Oxygen
   2. Ozone
   3. Nitrogen
   4. None of the above

Who invented the printing press?

1. 1. Johann Gutenberg
   2. Marconi
   3. Graham Bell
   4. Thomas Edison

What kind of energy is stored in a dry cell?

1. 1. Chemical
   2. Electrical
   3. Solar
   4. Mechanical

Which gas is used in advertising lights?

1. 1. Neon
   2. Argon
   3. Helium
   4. Carbon dioxide

A remote control gadget (for TV etc.) has in it_____.

1. 1. A small transmitter that emits infrared signals
   2. A small electromagnet, that emits electromagnetic
   3. A small oscillator that emits electric pulses
   4. None of these