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MASTER

CSIR AUTODIDACTPART A

Answer any 15 questions out of 20

Each question carries two marks and negative

marking 1/4

th

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1.The maximum value of Q is5P9+ 3R7+2Q8 = 1114

a) 12 c) 6b) 18 d) 9

2. From a building two balls A and B are thrown such that A is thrown upwards and Bdownwards (both vertically). IfA and B are their respective velocities on reaching the

ground, then:

a) A > B c) A < Bb) A = B d) their velocities depends on their masses.

3. If a body loses half of its velocity on penetrating 3 cm wooden block, then depth of thepenetration on the block before it comes to rest is

a) 1 cm c) 2 cmb)

3 cm d) 4 cm

4. A child swinging on a swing in sitting position, stand up , then the time period of theswing willa) Increase c) remain sameb)Decrease d) Increase if the child is long and

Decrease if the child is short.

5. If current passed through a spring then the spring willa) Expand c) remain the sameb) Compress d) none of these

6. KO2 is used in space and submarines because ita) Absorbs CO2 and increases O2 concentrationb) Absorbs moisturec) Absorbs CO2d) Produce ozone

7. The mineral vanadanite is a minor source ofa) Copperb) Leadc) Zincd) Iron

8. The poison found in the puffer fish is said to bea) Conotoxin c) Tetrodotoxinb) Saxitoxin d) Neosaxitoxin

9. Which of the following weak acid is said to be dissolving glasses?a) Nitrous acid c) Hydrocyanic acidb) Formic acid d) Hydrofluoric acid

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10.

In the figure, two circular beds (shaded region) have been shown on two sides of a square

lawn that has a height of 56 meters. The sum of the areas of the flower beds are

a) 2480 m2 c) 4032 m2b) 2016 m2 d) 3128 m2

11.Two pipes A and B can fill a tank in 24 minutes, respectively. If both the pipes areopened simultaneously, after how much time B should be closed so that the tank is full in

18 minutes?

a) 4 min. c) 8 min.b) 6 min. d) 10 min.

12.If a planet has twice the radius of the earth and half the earths density. The accelerationdue to gravity on the surface of the planet is (g is gravitational acceleration on the earth).

a) 4 g c) gb) 2 g d) g/2

13.

An iron bar of mass 6 kg is suspended by a rope of length 4 m from the ceiling. A force

of 50 N in the horizontal direction is applied at the midpoint of the rope. The angle that

the rope makes with vertical in equilibrium is

a) 45 c) 60b) 40 d) 90(Take g as 10 ms

-2)

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14.Pearl from the living shell mollusc is made up ofa) Calcium chloride c) Calcium sulfateb) Calcium carbonate d) Calcium oxalate

15.Consumption of oxalic acid causes precipitation of solid calcium oxalate in the body,therefore leading toa) Renal failure c) Colon cancerb) Myocardial infarction d) hyperparathyroidism

16.

A doughnut having an inner diameter of 8 m and the diameter of the whole doughnut is

1.5 times as that of the inner radius. Then, the area of the topping region should be

a) 6 m2 c) 36 m2b) 16 m2 d) 20 m2

17.If a mole of each of the following substances was dissolved in 1000 grams of water,which solution would have the highest boiling point?

a) NaCl c) CaCl2b) KCl d) C6H10O5

18.An alcoholic person will have frequent urination after a drink and the possible reasoncould be

a) Depression in production of vasopressinb) Increase in release of aldosteronec) Damage in filtering unit of kidneyd) Increase in sodium content in the blood.

19.Quorum sensing in bacteria is all abouta) Defense strategy against other microorganismb) Conjugation or exchange of genetic materialc) Communication system between the bacteriad) Molecular signalling process inside bacteria

20.A committee of four members is to be formed out of 6 men and 4 women. If thecommittee has include at least 2 women and a particular women is always selected, the

number of ways it can be formed is

a) 36 c) 64b) 60 d) 90