Q1. What among following is used to produce artificial rain?
(a) copper oxide
(b) carbon monoxide
(c) silver iodide
(d) silver nitrate
Q2. Which acid is present in lemon?
(a) marlic acid
(b) citric acid
(c) lactic acid
(d) tartaric acid
Q3. Bleaching action of chlorine is by—
Q4. Which one of the following air pollution can affect blood stream leading to death?
(b) Asbestos dust
(c) Carbon monoxide
Q5. Carotene in Indian cow’s milk causes?
(a) deep yellow colour
(b) Creamish white colour
(c) white colour
(d) yellow colour
Q6. What would happen if human blood becomes acidi ?
(a) Oxygen-carrying capacity of haemoglobin is increase
(b) Oxygen-carrying capacity of haemoglobin is decrease
(c) Will remain same
(d) Will be unpredictable
Q7. Which compound used in anti-malarial drug?
Q8. The absorption of ink by blotting paper involves—
(a) capillary action phenomenon
(b) viscosity of ink
(c) siphon action
(d) diffusion of ink through the blotting
Q9. The rotational effect of a force on a body about an axis of rotation is described in terms of
(a) Centre of gravity
(b) Centripetal force
(c) Centrifugal force
(d) Moment of force
Q10. Sudden fall in barometer is indication of which of the following?
(d) Clear weather