How much time the light from Sun takes to reach the Earth ?

• 2 minutes
• 4 minutes
• 8 minutes
• 12 minutes
Correct Option: C  [ 8 minutes ]

Remark: 8 minutes and 20 seconds

RADAR is used for

• locating submerged submarines
• receiving signals in a radio receiver
• locating geostationary satellites
• detecting and locating the position of objects such as aeroplane
Correct Option: D  [ detecting and locating the position of objects such as aeroplane ]

Remark:

When pressure is increased, then the melting point of ice:

• Increases
• Decreases
• Remains unchanged
• Depends on the impurities in the ice
Correct Option: B  [ Decreases ]

Remark:

A solar eclipse occurs when the :

• earth comes between the Sun and the Moon
• Sun comes between the earth and the moon
• Moon is at right angle to the earth
• Moon comes between the Sun and the Earth
Correct Option: D  [ Moon comes between the Sun and the Earth ]

Remark:

Dialysis is prescribed for patients having:

• Liver disease
• Lung trouble
• Kidney trouble
• Heart Disease
Correct Option: C  [ Kidney trouble ]

Remark:

Sodium stearate is a salt and is used?

• in gunpowder
• in Paint
• to make Soap
• to make fertilizer
Correct Option: C  [ to make Soap ]

Remark:

A substance used in the fire extinguisher under the trade name of Pyrene is:

• Carbon dioxide
• Chloroform
• Carbon tetrachloride
• Bleaching powder
Correct Option: C  [ Carbon tetrachloride ]

Remark:

Which of the following is a source of non-conventional energy?

• Firewood
• Diesel
• Petrol
• Biogas
Correct Option: D  [ Biogas ]

Remark:

Which of the following is not a nucleon?

• proton
• neutron
• electron
• positron
Correct Option: D  [ positron ]

Remark:

The primary producer in an ecosystem are:

• Bacteria
• Women
• Men
• Plants
Correct Option: D  [ Plants ]

Remark: