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(i) X reacts violently with cold water.

(ii) Y reacts with boiling water.

(iii) Z reacts with steam.

(A) Na, Mg, Zn

(B) Na, Zn, Fe

(C) Cu, Zn, Na

The value of is

(A) 0.039

(B) 0.235

(C) 0.25

On dividing 2272 as well as 875 by 3digit number N, we get the same remainder. The sum of the digits of N is

(A) 10

(B) 11

(C) 12

(A) 22 cm ²

(B) 44 cm ²

(C) 77 cm ²

Viraj found a fruit which he has not seen before. He wanted to find out whether the fruit is scattered in the same way as the Mimosa. He planned to do the following:
i. Throw it in the air.
ii. Examine the 'hooks'.
iii. Place it on his socks.
iv. Open it to look at seeds.
Which of the above actions are useful for his purpose?

A i and ii
B i, ii and iii
C ii and iii
D iii and iv

Read the given statements and mark the correct option.

Statement 1 : Copper sulphate solution is a good conductor of electricity.
Statement 2 : Conduction of electricity takes place in liquids due to flow of ions.

ABoth statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true but statement 2 is false.
DStatement 1 is false but statement 2 is true.

Which of the following statements regarding pinhole camera is/are not correct?
(i) Pinhole camera forms real image
(ii) Principle of image formation in pinhole camera is rectilinear propagation of light.
(iii) Pinhole in a pinhole camera acts as the lens.

A(i) only
B(i) and (ii)
C(ii) and (iii)
Dnone of them

Which of these is true about the speed of sound through solids, liquids and gases?
           Solid                    Liquid            Gas
ASlow                     Faster          Fastest
BAverage speed    Fastest          Slowest
CSlowest                Fastest         Average speed
DFastest                 Slower         Slowest