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Most Probable Questions for NEET 2021 (PHYSICS)

2O Most Probable Questions will help you score well in the Exam.

1 / 20

A thin rod of length f/3 lies along the axis of a concave mirror of focal f. One end of its magnified image touches an end of the rod. The length of the image is

2 / 20

A person can not see clearly an object kept at distance beyond 200 cm. Find the power of lens to be used for seeing clearly the object as infinity

3 / 20

In an atom, two electrons move around the nucleus in circular orbits of radii R and 4R. The ratio of the time taken by them to complete one revolution is

4 / 20

A transformer is employed to reduce 220 V to 11 V. The primary draws a current of 5 A and the secondary 90A. The efficiency of the transformer is

5 / 20

Find the intensity of light after passing through polarisor if the intensity of incident light is I

6 / 20

A 10 m long potentiometer wire is connected to a battery having a constant voltage in the primary circuit. A cell of unknown emf is balanced at 5.5 m length of the wire. If the length of the potentiometer wire is reduced to 8m, then the new balancing length will be

7 / 20

The efficiency of Carnot engine is 50% and temperature of sink is 500 K. If the temperature of source is kept constant and its efficiency is to be raised to 60%, then the required temperature of sink will be

8 / 20

If displacement of a body S = (200 ± 5) metres and time taken by it t = (20 ± 0.2) seconds, then percentage error in velocity

9 / 20

A light emitting diode (LED) has a voltage drop of 2 volt across it and passes a current of 10 mA when it operates with a 6 volt battery through a limiting resistor R. The value of R is

10 / 20

A dip needle in a plane perpendicular to the magnetic meridian will remain

11 / 20

In a double slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double slit within the central maxima of single slit pattern

12 / 20

Two trains, each of length 100 m, are running on parallel tracks. One overtakes the other in 20 sec. and one crosses the other in opposite direction 10 sec. Calculate the velocities of each train.

13 / 20

Two particles of masses m and 2m with charges 2q and 2q are placed in a uniform electric field E and allowed to move for the same time. The ratio of their kinetic energies will be

14 / 20

Length of a sonometer wire is either 95 cm or 100 cm, in both the cases a tuning fork produces 5 beats. Then the frequency of tuning fork is

15 / 20

The ratio of angular speeds of minute hand and hour hand of a watch is

16 / 20

A direct current of 2 A and an alternating current having a maximum value of 2 A flow through two identical resistance. The ratio of heat produced in the two resistances will be

17 / 20

A body falls from any height. The ratio of distance travelled in each time interval t during t = 0 to t = 3t of the journey is

18 / 20

Wavelength of n neutron at temperature 27°C is λ. Its wavelength at 927°C will be

19 / 20

Two liquids A and B are at temperatures of 75°C and 15°C. Their masses are in the ratio of 2 : 3 and their specific heats in the ratio 3 : 4. What is the resulting temperature

20 / 20

The temperature at which the rms speed of hydrogen molecules is equal to escape velocity on earth surface, will be

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