Q1.All the elements in a group (family) have a common valency. For example, all the elements of the carbon family (carbon, silicon, germanium, tin and lead) have common valency four. However, some of these elements can also have valency two. Which of the following can have valency two?
(a) Silicon, germanium and tin
(b) Only germanium and tin
(c) Germanium, tin and lead
(d) Only tin and leadQ2. 1. An alloy is a mixture of two or more metals
2. An alloy is a mixture of a metal or metals with a non-metal.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2 Q3. Which one of the following is not present in cement?
(d) Gypsum Q4. Which one of the following chemicals is used in beauty parlours for hair-setting?
(a) Sulphur based
(b) Phosphorus based
(c) Silicon based
(d) Iron basedQ5. The principle of cleaning by soap is
(a) surface tension
(d) elasticityQ6. Which among the following statements with regard to pH scale is/are correct?
I. It is a logarithmic scale.
II. The scale is limited to 10-14 because the ionic product of water is about 10–14
III. The lower the value of pH, the greater is the acidity of the solution.
Select the correct answer using the code given below
(a) I and II only
(b) I, II and III
(c) I and III only
(d) II onlyQ7. DIRECTIONS “This question consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answer to these items using the codes given below.
Statement I: After cutting an apple or a banana, the colour of the cut surface becomes brown.
Statement II: Polyphenolic compounds present in fruits get oxidized in air and show colour.
(a) Both the statements individually true and Statement II is the correct explanation of Statement I.
(b) Both the statements are individually true but Statement II is not correct explanation of Statement I.
(c) Statement I is true but Statement II is false.
(d) Statement I is false but Statement II is true.Q8. Kinetic viscosity of a given liquid is the ratio of the
(a) coefficient of viscosity to the density
(b) coefficient of viscosity to the surface tension
(c) density to the coefficient of viscosity
(d) surface tension to the coefficient of viscosityQ9. The mass of water vapour per unit volume of air is known
(a) relative humidity
(b) specific humidity
(c) absolute humidity
(d) variable humidityQ10. The following questions consist of two statements, one labelled as the Assertion (A) and the other as ‘Reason (R), You are to examine these two statements carefully and select the answers to these items using the codes given below:
Assertion(A): When water flows in a uniform horizontal pipe, there is a fall in pressure of water along the pipe.
Reason(R): Force is required to maintain the motion of the liquid against friction.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true and R is the NOT correct explanation of A
(c) A is true but R is false
(d) A is false but R is trueQ11. The value of which one of the following quantities remains same in all systems of units?
(a) Acceleration due to gravity
(b) Specific gravity
(d) Density Q12. Which one of the following statements correctly defines power?
(a) Energy supplied per unit time
(b) Energy of an object due to its motion
(c) Energy of an object due to its position
(d) None of the above
1. (c)2. (a)3. (c)4. (c)5. (a)6. (b)7. (a)8. (c)9. (c)10. (d)11. (b)12. (a)