JEE Main Test 1...

A diatomic ideal gas is used in a car engine as the working substance. If during the adiabatic expansion part of the cycle, volume of the gas increases from V to 32 V. The efficiency of the engine is

The efficiency of Carnot heat engine is 0.5, when the temperature of the source is T₁ and that of sink is T₂. The efficiency of another Carnot heat engine is also 0.5. The temperatures of source and sink of the second engine are respectively

Which of the following hydrogen bonds are strongest in vapour phase?

If n ≥ 2 is an integer

A solid sphere rolls down without slipping on an inclined plane at angle 60° over a distance of 10 m. The acceleration (in ms ^-2) is

The volumes of containers A and B, connected by a tube and a closed valve are V and 4 V, respectively. Both the containers A and B have the same ideal gas at pressures (temperatures) 5.0 ×10⁵ Pa(300 K) and 1.0 ×10⁵Pa (400 K), respectively. The valve is opened to allow the pressure to equalise, but the temperature of each container is kept constant at its initial value. Find the common pressure in the containers.

Two identical pendulums are oscillating with amplitudes 4 cm and 8 cm. The ratio of their energies of oscillation will be

The system of equations αχ + y + z = α - 1 and χ + y + αz = α - 1 has no solution, if α is

Which species has the maximum number of lone pair of electrons on the central atom ?