SA-node of mammalian heart is known as :

• Autoregulator
• Pace-maker
• Time controller
• Beat regulator
Correct Option: B  [ Pace-maker ]

Remark:

Light Year is a unit of

• Time
• Distance
• Brightness
• none of these
Correct Option: B  [ Distance ]

Remark: A unit of Astronomical distance equivalent to the distance that light travels in one year,

The mountaineers carry oxygen with them because:

• at an altitude of more than 5 km there is no air
• the amount of air available to a person on mountain is lesser than that available on the ground
• the temperature of air is lesser than that on the ground.
• The pressure of air is higher than that on the ground.
Correct Option: B  [ the amount of air available to a person on mountain is lesser than that available on the ground ]

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:

Which of the following animals is carnivorous?

• Elephant
• Horse
• Rhinoceros
• Tiger
Correct Option: D  [ Tiger ]

Remark:

The stars twinkle at night because:

• they emit energy
• of diffraction
• of refraction
• of relection
Correct Option: C  [ of refraction ]

Remark:

The element common to all acids is :

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

Remark:

Most plants absorb nitrogen in the form of:

• proteins
• nitrates and nitrites
• urea
• nitrates, nitrites and urea
Correct Option: D  [ nitrates, nitrites and urea ]

Remark:

The animal group that is not found in marine water:

• Mammals
• Amphibia
• Reptiles
• Aves
Correct Option: D  [ Aves ]

Remark:

Which polymer is used in making non-stick kitchen ware ?

• Nylon
• PVC
• Bakelite
• Teflon
Correct Option: D  [ Teflon ]

Remark: