Question : With symbols having their usual meanings, which one among the following is used as the standard for defining atomic mass units?

Option 1: C-12

Option 2: H-1

Option 3: O-8

Option 4: N-14

Question : Directions: In this question, a sentence is given with a blank to be filled in with an appropriate word. Four alternatives are suggested for each question. Choose the correct alternative out of the four alternatives.

'My India’ by Corbett deals ____ the author’s familiarity with and love of India.

Option 1: in

Option 2: of

Option 3: at

Option 4: with

Question : Two circles touch each other externally. The radius of the first circle with centre A is 18 cm. The radius of the second circle with centre B is 8 cm. Find the length of their common tangent CD.

Option 1: 23 cm

Option 2: 26 cm

Option 3: 24 cm

Option 4: 25 cm

Question : Two circles with their centres at O and P and radii 8 cm and 4 cm respectively touch each other externally. The length of their common tangent is:

Option 1: 8.5 cm

Option 2: $\frac{8}{\sqrt{2}}$ cm

Option 3: $8\sqrt{2}$ cm

Option 4: 8 cm

Question : Directions: At the time of sunrise, Diksha and Arpita are sitting in a park with their backs facing each other. If the shadow of Diksha falls to the right of Arpita, then in which direction is Arpita facing?

Option 1: North

Option 2: East

Option 3: West

Option 4: South