WBJEE 2019 Physics Revision Quiz 2 for JEE & BITSAT Exams

Question 1

Two monoatomic ideal gas at temperature T₁ and T₂ are mixed. There is no loss of energy. If the masses of molecules of the two gases are m₁ and m₂ and number of their molecules are n₁ and n₂ respectively. The temperature of the mixture will be :

Question 2

The figure shows the variation of energy with the orbit radius of a body in circular planetary motion. Find the correct statement about the curves A, B and C

Question 3

A disc arranges in a vertical plane has two groves of same length directed along the vertical chord AB and CD as shown in the fig. The same particles slide down along AB and CD . The ratio of the time t_AB/t_CD is

Question 4

A soap bubble has radius R and thickness d(<< R) as shown. It collapses into a spherical drop. The ratio of excess pressure in the drop to the excess pressure inside the bubble is.

Question 5

Two particles undergo SHM along parallel lines with the same time period (T) and equal amplitudes. At a particular instant, one particle is at its extreme position while the other is at its mean position. They move in the same direction. They will cross each other after a further time

Question 6

A body is rotating uniformly about a vertical axis fixed in an inertial frame. The resultant force on a particle of the body not on the axis is

Question 7

An electron is at ground state of the H atom. Minimum energy required to excite the H atom into second excited state is

Question 8

A person lives in a high-rise building on the bank of a river 50 m wide. Across the river is a well lit tower of height 40 m. When the person, Who is at a height of 10 m, looks through a polarizer at an appropriate angle at light of the tower reflection from the river surface, he notes that intensity of light coming from distance X from his building is the least and this corresponds to the light coming from light bulbs at height ‘Y’ on the tower. The values of X and Y are respectively close to (refractive index of water

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