check your concepts

An unpolarized light of intensity I₀ pass through a polarizer, it intensity become I₀/2. Now polarizer rotate by 15 degree then intensity of light becomes

• 3I₀/4

• zero

• I₀/4

• I₀/2

A tuning fork of frequency 204 hz produce 4 beats with an unknown tuning fork. Now prong of unknown tuning fork is filed then again it produce 4 beats. what is the original frequency of unknown tuning fork?

• must be 200 hz

• must be 208 hz

• 200 hz and 208 hz both possible

• must be 212 hz

two moles of an ideal gas with c_p/c_v=5/3 are mixed with 3 moles of another ideal gas with c_p/c_v=4/3, the value of c_p/c_v for the mixture is:

• 1.45

• 1.5

• 1.42

• 1.47

what is the heat rise in heat in 5 second?

• 2500 J

• 1500 J

• 3000 J

• 0 J

two solid sphere A and B both of m and radius R and 2R respectively are on smooth surface, sphere A is rolling with translation velocity V and angular velocity ω and sphere B is at rest. Now sphere A collide with sphere B ( head on elastic collision),after collision translation and angular velocity of sphere A respectively are

• V and ω

• V/2, ω/2

• 0,0

• 0,ω

find the current in wire A to B.

• 0

• 2 A

• 1 A

• -1 A

what is the charge went to the earth?

• 2Q

• 4Q

• 0

• 7Q

A 420m long rope of mass 5 kg joins two rock climbers. one climber strike the rope and the second one feels the effect 1.4 s later. the tension in the rope is n/14 KN. find the value of N

• 35

• 15

• 55

• 25