Which of the following is not a property of heavy water ?

• Boiling point of heavy water is lower than that of ordinary water
• density of heavy water is higher than that of ordinary water
• freezing point of heavy water is higher than that ordinary water
• it produces corrosion
Correct Option: A  [ Boiling point of heavy water is lower than that of ordinary water ]

Remark:

The element common to all acids is :

• Oxygen
• Hydrogen
• Nitrogen
• Sulphur
Correct Option: B  [ Hydrogen ]

Remark:

The only snake that builds its nest is:

• Krait
• King cobra
• Chain viper
• Saw scaled viper
Correct Option: B  [ King cobra ]

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:

The phenomenon of radioactivity was discovered by:

• Marie Curie
• Pierre Curie
• Henri Becquerel
• J J Thomson
Correct Option: C  [ Henri Becquerel ]

Remark:

Which of the following statements is not correct ?

• Rh⁺ person can donate blood to Rh⁺ person
• Rh^- person can donate blood to Rh^- person
• Rh^- person can donate blood to Rh⁺ person
• Rh⁺ person can donate blood to Rh^- person
Correct Option: D  [ Rh⁺ person can donate blood to Rh^- person ]

Remark:

The longest day in the southern Hemisphere is on :

• 22nd December
• 21st June
• 21st March
• 23rd September
Correct Option: A  [ 22nd December ]

Remark:

Widal test is employed to diagnose:

• Typhoid
• Cholera
• Tuberculosis
• AIDS
Correct Option: A  [ Typhoid ]

Remark:

Which one of the following has the highest fuel value ?

• Hydrogen
• Charcoal
• Natural gas
• Gasoline
Correct Option: A  [ Hydrogen ]

Remark: "Hydrogen" has the highest calorific value among commonly used fuels because it has a very high energy content, undergoes complete combustion, has a high heat of combustion, and can be used in various applications.

Who invented insulin?

• Jonas E. Salk
• Alexander Fleming
• F. Banting
• Roentgen
Correct Option: C  [ F. Banting ]

Remark: