Chemistry

Alkane

A single substitution of H atom in an alkane of molar mass 72 g mol‾ ¹ by chlorine produces only one product.

a. 2-methylbutane

b. 2,2-dimethylpropane

c. n-pentane

d. n-butane

Mathematics

Chapter: Solutions of Triangles

If in a triangle ABC, sin A, sin B, and sin C are in arithmetic progression, then

a. the altitudes are in A.P.

b. the altitudes in G.P

c. altitudes are in H.P.

d. the altitudes are equal

Physics

Friction

A fireman weighing 80 kg slides down a pole.If the resisting force of friction is a constant 720 N, his acceleration measured in m/sec² is:

a. 0.0

b. 1

c. 0.01

d. 0.11

## Sunday, February 15, 2009

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