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Refer to the some examples of different food groups (i) and (ii). Select the incorrect statement regarding them.


A The sources of food similar to items of group (i) can be potatoes, wheat and banana.
B The food items in group (ii) help in repairing worn-out tissues.
C The deficiency of food items present in group (ii) causes goitre.
D The simplest form of food of group (i) is glucose.

A boy standing in front of a large wall, bangs two objects against each other at an interval of 1.2 s regularly. The echo of the first bang coincides with the fifth bang.
If the speed of sound in air is 340 m s^–1, the distance between the boy and the wall is ____.

A 408 m
B 1632 m
C 816 m
D 204 m

The fundamental intervals of two thermometers P and Q are 45° and 100° respectively. The lower point of P is 0° and that of Q is 50°. If Q reads 110°, then the reading of thermometer P, is

A 18°C
B 27°C
C 36°C
D 55°C

The organ system shown here helps us to breathe. Which of the following gases does it inhale and exhale?


A Inhale oxygen, exhale carbon dioxide
B Inhale nitrogen, exhale oxygen
C Inhale carbon dioxide, exhale oxygen
D Inhale carbon dioxide, exhale methane

Which one of the following is true for all chemical reactions?

AThere is a change in volume
BHeat is evolved
CChemical bonds are broken or formed
DThere is a change in mass

Which of the following is not correctly matched?

A
B
C
D

A few materials are given in the box.
(i) Butter paper (ii) Cellophane sheet
(iii) Window pane (iv) Glass
(v) Water (vi) Air
The transparent materials among these are

A (ii), (iv) and (v) only
B (ii), (iii), (iv), (v) and (vi) only
C (i), (ii), (iv) and (vi) only
D (iii), (iv), (v) and (vi) only

Identify the correct statements among the following.
(i) A piece of wood is lighter than water.
(ii) Cotton will float on water if placed on wax paper.
(iii) An equal volume of aluminium will be heavier than iron.
(iv) An iron nail will sink in water.

A (ii) and (iii) only
B (ii), (iii) and (iv) only
C (i), (ii) and (iv) only
D (i), (ii), (iii) and (iv)

Read the given statements and select the option that correctly identifies true (T) and false (F) ones.
1. People who do more physical work need more carbohydrate-rich food.
2. Minerals help in the formation of bones, teeth and blood.
3. Eating too much of roughage containing food can make you obese.

There was a large number of dead fish drifting towards shore. Many dead birds with sticky, black coating feathers could also be seen there. A/An ______ might have occurred nearby.

A Tsunami
B Volcanic eruption
C Oil spill
D Earthquake