List of top Physics Questions

If the magnification of the mirror is greater than 1, then the mirror is

The lens which always give a diminished and virtual image is

A virtual image is formed by a concave mirror when the object is placed

Which molecules are responsible for the blue colour of the sky ?

Air bubble in water behaves like a

The radius of curvature of a spherical mirror is 16 cm. What is the focal length ?

Convex lens is used in the microscope due to the following reason

The kilowatt hour is the unit of

Which of the following pair of devices measure the same physical quantity?

According to 'Right hand thumb rule', if thumb of a right hand indicates direction of current passing through a straight conductor, then curled fingers of the same hand represent

The magnetic force on a current carrying wire placed in a uniform magnetic field if the wire is oriented perpendicular to the magnetic field is

Electric current carrying solenoid behaves like

Find the current (I) in the following circuit diagram

In a circuit two or more resistors are connected in parallel. Then the following quantity is same for all the resistors

Algebraic sum of potential differences in a closed loop is

Find the length of the conductor which is moving with a speed of 5 m/s in a direction perpendicular to the magnetic field of induction 2 tesla if it induces an emf of 10 V between the ends of the conductor.

According to which law 'Induced emf generated in a closed loop is equal to the rate of change of magnetic flux passing through it' ?

Dentist uses this mirror to examine teeth of patients.

An incompressible liquid is filled in a container. There is air above the liquid and a massless movable piston with a hole is also placed on the air. A thin capillary tube of inner radius 0.1 mm is dipped vertically into the liquid through the hole on the piston as shown in the figure. The air in the container is isothermally compressed from the original volume V₀ to \(\frac{100}{101}\)V₀ with the movable piston. Considering air as an ideal gas, the height (h) of the liquid column in the capillary above the liquid level in cm is:

(given T_water =0.075N/m, P₀=10⁵N/m² , g=10m/sec²,  \(\rho l\)=10³ kg/m³, \(\theta=0\))

A cyclic process is shown in the p-v diagram and T-S diagram. Which of the following statement(s) is/are true?

Three resistors having resistances r₁, r₂ and r₃ are connected as shown in the given circuit. The ratio \(\frac{i_3}{i_1}\) of currents in terms of resistances used in the circuit is

When a p-n junction diode is in forward bias, which type of charge carriers flows in the connecting wire?

A full-wave rectifer with diodes D₁ and D₂ is used to rectify 50 Hz alternating voltage. The diode D₁ conducts _______ times in one second.

A particle at rest starts from the origin with a constant acceleration a that makes an angle 60° with the positive y-axis. If its displacement along y-axis is 10m in time 2s,then the magnitude of a is: