The major excretory product in human beings is

• uric acid

• ammonium chloride

• urea

• ammonia

A VIIIth class student makes the statement.

"Heavy objects sink in water and light objects float."

How is the science teacher of the VIII class best advised to react?

• Present counter examples and arrange materials of different shapes, sizes and weights for the child to investigate

• Explain that heavy and light are relative terms

• Accept the statement as it indicates the child's ideas and needs to be respected

• Explain to the child that it is not the weight but the density of an object that determines whether it is going to sink or float

Medium A is optically denser than Medium B. Which one of the following statements is true?

• Speed of light is same in both A and B

• Cannot be compared

• Speed of light is more in medium A than in medium B

• Speed of light is more in medium B than in medium A

There are two planets in our solar system which rotate from East to West. These planets are

• Mercury and Venus

• Uranus and Neptune

• Mercury and Uranus

• Venus and Uranus

Which one among the following situations gives the students, the best opportunity of 'discovery learning'?

• Encouraging students to investigate factors affecting germination through experimentation

• Instructing students through team teaching on the topic of 'components of food'

• Students being first shown the demonstration of germination of seed followed by a detailed explanation

• Elaborated and detailed session of programmed instruction on the topic of 'germination of seed'

Which one of the following is not a conductor of electricity?

• Saltwater

• Distilled water

• Vinegar

• Lime juice

Which one of the following statements is incorrect?

• Generally, the voice of a man is shriller than that of a woman

• A bird makes a high pitched sound whereas a lion makes a low pitched roar

• A drum vibrates with a low frequency, therefore it produces a low pitched sound

• A whistle has a high frequency and therefore it produces a sound of higher pitch

A block of iron dropped in a vessel of water, sinks to the bottom. This is because

• the weight of the block is less than the weight of the water displaced by the block

• the density of water is more than the density of the block

• the vessel is not deep enough to allow the block to float

• the weight of the water displaced by the block is less the weight of the block

Which of the following process/processes destroy/destroys the magnetic properties of a bar magnet?

1. Cutting into two pieces
2. Heating
3. Beating
4. Sealing

• I, II and III

• I and IV

• Only I

• II and III

We are not crushed under the weight of the atmosphere, because

• the pressure inside our body is less than atmospheric pressure

• the pressure inside our body is equal to the atmospheric pressure and cancels the pressure from outside

• the pressure inside our body is more than atmospheric pressure

• the pressure inside our body is more than atmospheric pressure and cancels the pressure from outside