Which of the following set contains same number of molecules?
A. 1 gram O₂ , 2 gram SO₂
B. 1 gram CO₂ 1 gram N₂O
C. 1 gram CO₂ 1 gramN₂
D. 1 gram O₂ 1 gram O₃

• A, B and C

• A and B

• C and D

• All of these

Which one of the following is not an example of electromagnetic waves?

• Ultraviolet rays

• Radio waves

• X-rays

• Sound waves in air

The example of thermosetting and thermoplastic polymer respectively is

• polystyrene, polyvinylchloride

• bakelite, polystyrene

• polyethene, polyacredonitrile

• polystyrene, urea-formaldehyde resin

Which of the following is not a 'greenhouse gas'?

• SO₂

• CFC

• CH₄

• N₂O

Which of the following is the weakest Lewis Base?

• OH^-

• H^-

• HCO_3^- 

• Cl^-

If the result of an experiment turn out to be different then what was expected, then it can be concluded that

• one has not followed scientific method

• one need to repeat the experiment till the desired results are obtained

• one must admit that the experiment was a failure

• one should explore the possible reasons for it in the conclusion section

7.

The cooking gas is mainly a mixture of the following two gases

• methane and ethane

• ethane and propane

• propane and butane

• butane and pentane

In Bryophyllum reproduction occurs

• through stem

• through leaf

• through flower

• through root

Radiation with maximum penetration power is

• infrared radiation

• ultraviolet radiation

• X-rays

• $\mathrm{\gamma }$-rays

The mass of man is 72 kg at Earth. The value of g at the Moon's surface is 1/6 of that on the Earth. The mass of man at the Moon will be

• 12 kg

• 120 kg

• 72 kg

• 432 kg