Asset

1. A large cube of ice, at 0 C, placed in a large beaker, on melting forms water.

The water in the beaker is cooled in a freezer and forms ice once again at 0 C. In what way is the ice formed at the end of the process different from that at the start?

• Its shape

• Its weight

• Its volume

• All of the above

1) During which chemical process is energy absorbed?

• Iron nails rusting

• o Candles burning

• o Vegetables rotting

• o Plants photosynthesizing

In the figure given, compared to wave P, wave Q would be _________

• . louder

• softer(less sound

• of higher pitch

• of lower pitch

Sliced apples, when kept in water, take longer to turn brown than those kept outside. This is because of the enzymes, the proteins which speed up the biochemical reactions, present in an apple. Which of the following could be the reason for this?

• . The enzymes react with water and produce a white coating

• The enzymes do not have access to oxygen.

• The enzymes cannot work at such low temperatures

• The enzymes die in the presence of water.

A car headlight bulb is marked 48 W 12 V. Can this bulb be used at home in place of a regular electric bulb?

• Yes, it can. The bulb will glow much brighter.

• Yes, it can. But the bulb will glow less brightly.

• No, it cannot. The bulb will burn out

• No, it cannot. The bulb will not fit into the holder.