Sample NEET Mock Test - NEET MCQ

Emission of electrons in the photoelectric effect is possible, if

A heavy mass is attached to a thin wire and is whirled in a vertical circle. The wire is most likely to break

If there is an increase in length by 0.1% due to stretching, the percentage increase in its resistance willbe

A 2 Ω resistor is connected inseries with R Ω resistor. This combination is connected across a cell. When the potential difference across 2 Ω resistor is balanced on a potentiometer wire, null point is obtained at a length of 300 cm. When the same procedure is repeated for R Ω resistor, null point is obtained at a length of 350 cm . Value of R is

An electron remains undeflected when passing perpendicular to mutually perpendicular electric and magnetic fields. If the magnetic field is 8 Gauss and elecric field is 4000 V/m, the velocity of the electron is

In a discharge tube at 0.2 mm of Hg pressure, there is a formation of

The de-Broglie wavelength of an electron in the first Bohr orbit is

Which of the following is true for photon

Which of the following electromagnetic waves have the smallest wavelength?

Which of the following radiations has the least wavelength?

An L.C. circuit contains 10 mH inductor and a 25 μ F capacitor. The resistance of the circuit is negligible. The energy stored in the circuit is completely magnetic at time (in milli seconds) being measured from the instant when the circuit is closed

At a point A, there is an electric field of 500 V-m⁻¹ and potential difference of 3000 V. The distance between the point charge and the point A is

The escape velocity of an object on a planet whose radius is 4 times that of the earth and acceleration due to gravity 9 times that on the earth is

A gas exerts pressure on the walls of the container, because the gas molecules

Two capacitors of capacity 4 μF and 6 μF are connected in series and a battery is connected to the combination the energy stored is E₁. If they are connected in parallel and if the same battery is connected to this combination the energy stored is E₂. The ratio of E₁ and E₂ is

A body takes 5 minutes for cooling from 50°C to 40°C. Its temperature comes down to 33.33°C in next 5 minutes. Temperature of surroundings is

A stone of mass m is tied to a string and is moved in vertical circle of radius r making n revolutions per minute. The total tension in the string when the stone is at lowest point is

A rectangular loop carrying current i is placed in a uniform magnetic field B. The area enclosed by the loop is A. If there are n turns in the loop, the torque acting on the loop is given by

In a deflection magnetometer experiment in tan A position, a short-bar magnet placed at 18 cm from the centre of the compass needle produces a deflection of 30° . If another magnet of same length but 16 times pole strength as that of first magnet is placed in tan B position at 36cm, the deflection will be

The pole strength of a 12cm long bar magnet is 20 A-m. The magnetic induction at a point 10cm away from the centre of the magnet on its axial line is ( μ 0 4 π = 10^-7 Hm^-1 )

If iron pieces loaded in a ship, are thrown into the water, then level of water will

The Young's modulus of a wire of length (L) and radius (r) is Y N-m⁻². If the length is reduced to L/2 and radius to r/2, then Young's modulus for the wire will be

The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an:

The above is a plot of binding energy per nucleon E_b, against the nuclear mass M;, A, B, C, D, E, F correspond to different nuclei. Consider four reactions:
(i) A + B → C + ε
(ii) C → A + B + ε
(iii) D + E → F + ε and
(iv) F → D + E + ε
Where ε is the energy released ? In which reactions is ε positive?

A radio active sample has a half life of 5 days. To decay from 8 micro curies to 1 micro-curie, the number of days taken will be

If a simple pendulum oscillates with an amplitude 50 mm and time period of 2 s, then its maximum velocity, is

For what distance is ray optics a good approximation when the aperture is 4 mm wide and the wavelength is 500 nm?