Physics NEET Daily MCQs Practice Questions | 5 August, 2024

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

The graph shows variation of photo current versus anode potential. If work function of cathode used in experiment is 4eV, then energy of incident photon is :-

In Bohr model of hydrogen, the force on electron depends on the principal quantum number as :

At what distance from a convex lens of focal length 30 cm an object should be placed so that the size of image be 1/4^th of the object :-

The logic circuit shown below has the input wave form 'A' and 'B' as shown. Pick out the correct output wave form :

Output y is :

Calculate the capacitive reactance of a condenser in order to run a bulb rated at 10 watt 60 volt when connected in series to an a.c. source of 100 volt:-

Resistance of a conductor at 100°C temperature is 4Ω and at 600°C temperature resistance is 5Ω then what would be value of temperature coefficient of resistance :-

Match the column:

Two point charges $-q$ and $+q$ are located at points $(0, 0, -a)$ and $(0, 0, a)$, respectively. The potential at a point $(0, 0, z)$ where $z > a$ is:​

A wire of area of cross-section 10^-6m² is increased in length by 0.1%. The tension produced is 1000 N. The Young's modulus of wire is :

Figure shows graph of deviation (δ) versus angle of incidence (i) for a light ray striking a prism. Angle of prism is :-

A vertical rectangular door with its centre of gravity at O (see figure) is fixed on two hinges A and B along one vertical length side of the door. The entire weight of the door is supported by the hinge A. Then the free body force diagram for the door (the arrows indicate the direction of the forces) is :-

A bullet of mass 5 gm moving with speed 200 m/s strikes a target. Then calculate rise of temperature of bullet. Assume all the loss in kinetic energy is converted into heat energy of bullet and its specific heat is 500 J/kg°C.

Assertion :- Mean free path of gas molecules, varies inversely as density of the gas.
Reason:- Mean free path of gas molecules is defined as the average distance travelled by a molecule between two successive collisions.

In C.G.S. system the magnitude of the force is 100 dynes. In another system where the fundamental physical quantities are kilogram metre and minute, the value of force is :-

The pitch of screwgauge is 1 mm and number of circular scale divisions in screwgauge are 50. The screwgauge reads 3 circular divisions when nothing is put in-between jaws of screwgauge. By using this screwgauge, the diameter of wire is measured, the reading is 7 divisions on linear scale and 36 division on circular scale. The diameter of wire is :

In YDSE, one of the slit is wider than the other, so that the amplitude of the light from one slit is double of that from the other slit. If $I_m$ be the maximum intensity, the resultant intensity $I$ when they interfere at a phase difference $\varphi$ is given by:

A planet revolves about the sun in an elliptical orbit. The aerial velocity $\left(\frac{dA}{dt}\right)$ of the planet is $2\times 10^{16}{\text{m}}^2\mathrm{/}\text{sec}$. If the least distance between the planet and the sun is $2\times 10^{12}\text{m}$ then maximum speed of the planet in km/sec is given by:

A force F is applied on the block as shown in figure. If g = 10 m/s² then the acceleration of the block is :-

The potential energy $U$ of a particle is given by $U=\{20+(x-4{)}^2\}\text{J}$. Total mechanical energy of the particle is 36 J. Select the correct alternative: