Practice Set 1

A car accelerates from rest at a constant rate for some time after which it decelerates at a constant rate to come to rest. If the total time elapsed is t seconds, the total distance travelled is : A car accelerates from rest at a constant rate for some time after which it decelerates at [...]

The vernier scale used for measurement has a positive zero error of 0.2 mm. If while taking a measurement it was noted that ‘0’ on the vernier scale lies between 8.5 cm and 8.6 cm, vernier coincidence is 6, then the correct value of measurement is……. cm. (least count = 0.01 cm) The vernier scale [...]

Two identical metal wires of thermal conductivities K1 and K2 respectively are connected in series. The effective thermal conductivity of the combination is : Two identical metal wires of thermal conductivities K1 and K2 respectively are connected in series. The effective thermal conductivity of the combination is : September 28, 2021 Category: JEE Mains Physics [...]

An electron of mass m and a photon have same energy E. The ratio of wavelength of electron to that of photon is : (c being the velocity of light) An electron of mass m and a photon have same energy E. The ratio of wavelength of electron to that of photon is : (c [...]

A solid disc of radius ‘a’ and mass ‘m’ rolls down without slipping on an inclined plane making an angle θ with the horizontal. The acceleration of the disc will be 2/b g sin θ where b is ………. (Round off to the Nearest Integer) (g = acceleration due to gravity) (θ = angle as [...]

A polyatomic ideal gas has 24 vibrational modes. What is the value of y ? A polyatomic ideal gas has 24 vibrational modes. What is the value of y ? September 28, 2021 Category: JEE Mains Physics 2002-2019 Solved Video Solutions , Practice Set 1 ,

For an ideal heat engine, the temperature of the source is 127°C. In order to have 60% efficiency the temperature of the sink should be ……….°C. (Round off to the Nearest Integer) For an ideal heat engine the temperature of the source is 127°C. In order to have 60% efficiency the temperature of the sink [...]

When two soap bubbles of radii a and b (b > a) coalesce, the radius of curvature of common surface is : the radius of curvature of common surface is : When two soap bubbles of radii a and b (b > a) coalesce September 28, 2021 Category: JEE Mains Physics 2002-2019 Solved Video Solutions [...]

If an electron is moving in the nth orbit of the hydrogen atom, then its velocity (vn) for the nth orbit is given as : If an electron is moving in the nth orbit of the hydrogen atom then its velocity (vn) for the nth orbit is given as : September 28, 2021 Category: JEE [...]

A closed organ pipe of length L and an open organ pipe contain gases of densities ρ1 and ρ2 respectively. The compressibility of gases are equal in both the pipes. Both the pipes are vibrating in their first overtone with same frequency. The length of the open pipe is x/3L root P1/P2 where x is [...]