Q.1

Ravi was discussing fibres and fabrics with his classmate Shane and this is what they said:

Ravi: Polyester burns slowly and does not shrink. It is always self-extinguishing. It leaves no ash but its black smoke and fume are hazardous.
Shane: Silk is a protein fibre which burns slowly and curls away from the flame. It is self-extinguishing. It gives out little or no smoke and the fume has no hazard.

Choose the correct option related to the two statements:

Q.2

What is common between the following symptoms?

Poor vision, loss of vision in darkness and sometimes complete loss of vision

Q.3

Given below are a set of phenomena:

1. Folding the paper into an aeroplane.
2. Melting of ice candy.
3. Wet clothes to dry clothes
4. Dissolving sugar in water

What is the basis of the given grouping?

Q.4

Spot the principle on which the distillation method works for separating alcohol and water mixture?

Q.5

Select the one from below that is different from the other three based on the types of motion:

1. Heart pumping blood
2. A racing car speeding on a race track
3. A rocking chair
4. Revolution of the moon around the earth

Q.6

Which of the following pairs are wrongly classified?

M: Nitrogen - Takes up four-fifths of the air space
N: Oxygen - End product of photosynthesis
O: Carbon dioxide - Production by factories
P: Smoke - Produced by plants

Q.7

Complete the following sentences and select the correct option:

I- If it does not rain in a region for a year or more then the soil continues to lose water by _______________.
II- Heavy rains may lead to rise in the level of water in _________.

Q.8

What do the following suggest about all living things?

1. Flowers of some plants bloom only at night.
2. In some plants, flowers close after sunset.
3. In some plants like a mimosa, commonly known as ‘touch-me-not’, leaves close or fold when someone touches them.
4. A boy removes finger instantly after touching hot iron.

Q.9

Answer the following question and choose the correct option:

In which direction does the bar magnet come to rest when suspended freely?

Q.10

Three students gave the following statements during a classroom discussion. This is what they said:

Dhwani: Motion of a vibrating tuning fork exhibits periodic motion.
Neeta: The blades of the fan is said to move in a rotatory motion.
Mahesh: The length of the footsteps is the same for different people.

Which student(s) made incorrect statement(s)?