Q1.Which one among the following is a chemical process?
(a) Distillation of sea (salty) water
(b) Crystallisation of impure salt (NaCl)
(c) Production of Iodine (I2) from sea-weeds
(d) Sublimation of iodine (I2)Q2. Which one among the following does not have an allotrope?
(d) CarbonQ3. What is the reason for white cement to be white?
(a) It does not contain carbon
(b) It does not contain silicon
(c) It does not contain iron
(d) It does not contain calcium Q4. Which substance is used to retard the setting action of cement?
(c) CaSO4, 2H2O
(d) Na2O + K2O Q5. Iodized salt is a
(a) mixture of potassium iodide and common salt
(b) mixture of molecular iodine and common salt
(c) compound formed by combination of potassium iodide and common salt
(d) compound formed by combination of molecular iodine and common saltQ6. Which of the following salts are insoluble in water?
(a) Chlorides of Fe and Mn
(b) Nitrates of Ag and Pb
(c) Carbonates of Pb and Cu
(d) Phosphates of Na and NH4 Q7. Which of the following statements regarding oxidation and reduction are correct?
1. In oxidation, loss of electron takes place whereas in reduction, gain of electron takes place.
2. In oxidation, gain of electron takes place whereas in reduction, loss of electron takes place.
3. Oxidizing agent decreases the oxidation number but reducing agent increases the oxidation number.
4. Oxidizing agent increases the oxidation number but reducing agent reduces the oxidation number.
Select the correct answer using the code given below:
(a) 1 and 3
(b) 2 and 4
(c) 2 and 3
(d) 1 and 4Q8. A block of ice is floating in a beaker containing liquid of specific gravity greater than one. When ice melts completely what happens to the level of liquid in the beaker?
(a) It will remain the same as before
(b) It will go down
(c) It will rise up
(d) It may or may not change depending upon size of beaker Q9. A solid cube of iron (specific gravity = 8) is melted into sheets. The side of the cube is 1m. The sheets are used to make a hollow cube. This cube floats such that its whole volume is inside water. What should be the minimum length of side of such a cube?
(a) 2.0 m
(b) 2.5 m
(c) 2.75 m
(d) 3.0 m Q10. Water flows out of the hole of a bucket and follows a parabolic path. If the bucket falls freely under gravity, the water flow (ignoring air resistance)
(a) follows a straight-line path relative to the falling bucket
(b) follows a parabolic path relative to the falling bucket
(d) decreases but continues to flowQ11. A stone is thrown vertically upwards with an initial velocity u from the top of a tower of height 12u2/g. With what velocity does the stone reach the ground?
(d) Q12. An object of mass 5 kg is attached to the end of a rope. If the rope is pulled upward with an acceleration 0.30 ms–2, what is the tension in the rope?
(a) 30.5 N
(b) 40.5 N
(c) 50.5 N
(d) 60.5 N
1. (c)2. (c)3. (c)4. (c)5. (a)6. (c)7. (d)8. (c)9. (a)10. (b)11. (c)12. (c)