Which one of the following is not a Green House Gas?

• Water vapours

• Methane

• Ozone

• Carbon Monoxide

Which of the following statements regarding heavy water are correct?

1. It is extensively used as a moderator in nuclear reactors
2. It cannot be used in exchange reaction to study reaction mechanism
3. Viscosity of heavy water is relatively smaller than that of ordinary water
4. The dielectric constant of heavy water is smaller than that of ordinary water

Select the correct answer using the code given below:

• 1 and 2

• 2 and 3

• 3 and 4

• 1 and 4

The silvering in thermos flasks is done to avoid heat transfer by:

• Convection

• Conduction

• Radiation

• Both convection and conduction

Which one of the following is the correct sequence about various levels of organization of Biosphere?

• Eco system-Biosphere-Community-Population

• Population-Organism-Eco system-Biosphere

• Organism-Community-Population-Biosphere

• Organism-Population-Eco system-Biosphere

A spring can be used to determine the mass m of an object in two ways : (i) by measuring the extension in the spring due to the object; and (ii) by measuring the oscillation period for the given mass. Which of these methods can be used in a space-station orbiting Earth?

• Both

• Only the extension method

• Only the oscillation method

• Neither

Precursor of which one of the following vitamins comes from β-carotene?

• Vitamin A

• Vitamin C

• Vitamin D

• Vitamin K

Which one of the following statements is not correct?

• The Kelvin scale of temperature is called the Absolute scale

• Visible light radiation has wavelength range of 400-700 nm

• The capacity to do work is called power

• The wavelength of Gamma rays is less than that of X-rays

The radius of the Moon is about one-fourth that of the Earth and acceleration due to gravity on the Moon is about one-sixth that on the Earth. From this, we can conclude that the ratio of the mass of Earth to the mass of the Moon is about

• 10

• 100

• 1000

• 10000

Which one of the following statements is not correct?

• Conduction can occur easily in solids, less easily in liquids but hardly at all in gases

• Heat energy is carried by moving particles in a convection current

• Heat energy is carried by electromagnetic waves in radiation

• The temperature at which a solid changes into a liquid is called the boiling point

The absolute zero, i.e., temperature below which is not achievable, is about:

• 0°C

• -273 K

• -273°C

• -300°C