Q1.In mammals, an important role of excretion is played by________
(a) Large intestine
(b) Kidneys
(c) Lungs
(d) Liver
Q2.Which of the following caused radioactive pollution along the coast of Kerala?
(a) Plutonium
(b) Zinc
(c) Thorium
(d) Radium
Q3.Activated Charcoal is used to remove colouring matter from pure substances by_______
(a) Bleaching
(b) Oxidation
(c) Adsorption
(d) Reduction
Q4.Chernobyl disaster is the result of pollution by_____________
(a) Oil spill
(b) Acid rain
(c) Carbon dioxide
(d) Radioactive waste
Q5.Which of the following is not soluble in water?
(a) Lead sulphate
(b) Zinc sulphate
(c) Potassium sulphate
(d) Sodium sulphate
Q6.Which of the following is responsible for transport of food and other substances in plants?
(a) Xylem
(b) Phloem
(c) Chloroplast
(d) None of these
Q7.Which lobe of human brain is associated with hearing?
(a) Frontal lobe
(b) Parietal lobe
(c) Temporal lobe
(d) Occipital lobe
Q8.The washing machine works on the principle of ____________
(a) Dialysis
(b) Diffusion
(c) Reverse osmosis
(d) Centrifugation
Q9.___________gives hardness to stainless steel.
(a) Zinc
(b) Lead
(c) Carbon
(d) Tin
Q10.Which of the following is/are ‘rain cloud’?
1. Cirrus
2. Nimbostratus
3. Cumulonimbus
4. Altocumulus
(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 and 4 only
(d) 1 and 4 only
Q11.Particulates (< 1 μm size) remaining suspended in air indefinitely and transported by wind currents are called
(a) Mists
(b) Fumes
(c) Aerosols
(d) Smoke
Q12.A bomb explodes on the moon. You will hear its sound on earth after _________
(a) 20 minutes
(b) 2 hrs 20 minutes
(c) 3.7 hours
(d) You cannot hear the sound of explosion
Q13.Which one of the following takes place during a nuclear fusion?
(a) a heavy nucleus bombarded by neutrons breaks up
(b) a heavy nucleus breaks up spontaneously
(c) two light nuclei combine to form a heavy nucleus
(d) a light nucleus breaks up spontaneously
Q14.Which of the following is a commercial source of energy?
(a) Agricultural Waste
(b) Dried dung
(c) Sun
(d) Natural gas
Q15.Addition of suitable impurities into semiconductor, is called—
(a) Doping
(b) Mixing
(c) Forming
(d) diluting
