Physics Mock Test - II

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PHYSICS

No of Questions
75
No of Questions
75
No of Questions
75
No of Questions
75
No of Questions
75
Q 1.
Light of wavelength 4000 Å is incident on a metal plate whose work function is 2 eV. The maximum kinetic energy of the emitted photoelectrons would be






Q 2.
A wire of length 1 m increases in length by 0.02 m. When subjected to a tensile stress of \(12\times10^8\ N/m^2\) . The Young’s modulus of material of the wire is






Q 3.
The angular speed of the electron in the \(nth\) orbit of Bohr’s hydrogen atom is






Q 4.
Water rises up to a height h in a capillary tube of certain diameter. When this is replaced by a tube of half the diameter, then water will rise to a height of






Q 5.
The half-life of radon is 4 days. 10 gram of radon after 16days will reduce to






Q 6.
A small drop of oil spreads over water because






Q 7.

The mass M is attached to two springs according to the figure. If the frictional force is absent the time period of horizontal oscillation of the body will be:








Q 8.
The materials for the construction of electro magnets should have






Q 9.

A sinusoidal voltage of peak value 200 volt is a connected to a diode and resistor R in the circuit shown so that half wave rectification occurs. If the forward resistance of the diode is negligible compared to R, the rms voltage across R is








Q 10.
An aeroplane flies along a straight line from A to B with air speed \(V \) and back again with the same air speed. If the distance between A and B is \(l \) and a steady wind blows perpendicular to AB with speed \(u \) , the total time taken for the round trip is






Q 11.

What are the accelerations of 'A' and 'B' respectively. ( wedge is fixed, string and pulley are ideal )








Q 12.
Two shells are fired from a cannon with same speed at angle \(\alpha\)and \(\beta\) respectively with the horizontal. The time interval between the shots is T. They collide in mid-air after time 't' from the first shot. Which of the following conditions must be satisfied?






Q 13.
A solid sphere, hollow sphere, solid cylinder, hollow cylinder and ring each of mass M and radius R are simultaneously released at rest from top of incline and allowed to roll down the incline. The angular acceleration is maximum for






Q 14.
Paraffin have relative permittivity K = 2.1, find the refractive index for paraffin? (Relative permeability of paraffin \(\mu_r \simeq 1\))






Q 15.
In Young’s Double Slit Experiment, the slits are 0.5 mm apart and the interference is observed on a screen at a distance of 100 cm from the slits. It is found that the ninth bright fringe is at a distance of 7.5 mm from the second dark fringe from the centre of the fringe pattern. The wavelength of light used is






Q 16.
A particle of mass m is moving in a circular path of radius r under the influence of centripetal force \(F--C/r^2\) . The total energy of the particle is






Q 17.

A photon has same wavelength as the de-Broglie wavelength of electrons. Given C=Speed of light V=Speed of electron

\(E_e\) = Kinetic energy of electrons                                              \(E_{Ph}\) = Kinetic energy of photon

\(P_e\) = Momentum of electron                                                     \(P_{Ph}\) = Momentum of photon

Which of the following is correct?








Q 18.

A cyclic process is shown on the V-T diagram. The same process on a P-T diagram is shown by








Q 19.
The wavelength of characteristic X-ray \(K_\alpha\) line emitted by a hydrogen like element is 0.32\(A^0\) . Calculate the wavelength of \(K_\beta\) line emitted by the same element






Q 20.

A sinusoidal voltage of rms value 200 volt is connected to the diode and capacitor C in the circuit shown so that half wave rectification occurs. The final potential difference in volt across C is








Q 21.
A standing wave is formed in a string of length 150 cm and mass 1.5 kg tied at both ends. Tension in the string is 36 N. There are 4 nodes on the string other than the ends. Calculate the natural frequency of the wave?






Q 22.
A meter bridge is balanced at 40 cm from left end, when a known resistance 4\(\Omega\) is fixed in left gap and a metal wire of length 10 cm and diameter 1 cm is fixed in right gap. The resistivity of the wire is?






Q 23.
A large hollow metallic sphere A (of radius R) is positively charged to a potential of 100 V and a small sphere B (of radius R/5 )is also positively charged to a potential of 100 V. Now B is placed inside A and they are connected by a wire. The final potential of A will be






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