Problems-Questions-Chemistry,Maths,Physics, Feb 15

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