Q1. If a rock is brought from the surface of the moon to the earth, then which of the following statement is correct?
(a) its mass will change.
(b) both mass and weight will change.
(c) its weight will change but not its mass.
(d) both mass and weight will remain the same.
Q2. Which of the following systems in man is affected by the bite of cobra?
Q3. Why pendulum clocks become slow in summer?
(a) days in summer are large.
(b) of the friction in the coil.
(c) the length of the pendulum increases.
(d) the weight of the pendulum changes.
Q4. Which one of the following statements is not true for a person suffering from hypermetropia?
(a) The person can see far objects distinctly.
(b) The focal length of the lens is large.
(c) The image of the close object is focused behind the retina.
(d) A concave lens is used to correct this defect.
Q5. What is the minimum height of a plane mirror to see the full size image of a person?
(a) the height of the person
(b) half the height of the person
(c) one-fourth the height of the person
(d) double the height of the person
Q6. Following statements are made in connection with carbon dioxide (CO2)
1. CO2 is a poisonous gas.
2. CO2 is an acidic oxide.
3. CO2 turns limewater milky.
Which of the statements given above is/are correct?
(a) 1 and 2
(b) 2 and 3
(c) 3 only
(d) 1 and 3
Q7. Blood and lymph are types of
(a) muscular tissue
(b) epithelial tissue
(c) connective tissue
(d) permanent tissue
Q8. Why Helium is preferred to hydrogen in air balloons?
(a) its cheaper
(b) it is less dense
(c) it has greater lifting power
(d) it does not form an explosive mixture with air
Q9. What is the average life span of human R.B.C?
(a) 100 days
(b) 90 days
(c) 120 days
(d) None of these
Q10. Which one of the following pairs is not correctly matched?
(a) Dry ice : Solid carbon dioxide
(b) Mustard gas : Poisonous liquid used in chemical warfare
(c) Teflon : Polymer containing fluorine
(d) Fullerene : Organic compounds containing fluorine
Q11. Consider the following statements:
1. Diamond is hard and graphite is soft.
2. Diamond is soft and graphite is hard.
3. Diamond is a bad conductor but graphite is a good conductor.
4. Diamond is a good conductor but graphite is a bad conductor.
Which of the statements given above is/are correct ?
(a) 1 and 3
(b) 1 only
(c) 2 and 3
(d) 1 and 4
Q12. A fluorescent tube is preferred to an electric bulb because—
(a) it has a larger light emitting surface.
(b) voltage fluctuations do not affect it.
(c) in a tube electrical energy is almost converted into light.
(d) None of these
Q13. Which of the following is a non-poisonous snake?
(d) All of these
Q14. Which one among the following hormones stimulates the plant cells to grow in a manner such that the plant appears to be bent towards light?
(d) Abscisic acid
Q15. Which one of the following organs breaks down fat to produce cholesterol?