List of top Physics Questions

In which case does the potential energy decrease?

If the momentum of a body increases by $50\%$, its kinetic energy will increase by

A particle moving with a uniform acceleration travels $24\, m$ and $64 \,m$ in the first two consecutive intervals of $4\,s$ each. Its initial velocity is

A particle moves in the $xy$ - plane under the action of a force $\vec{ F }$ such that the components of its linear momentum $\vec{ P }$ at any time $t$ are $P_{x}=2 \cos t, P_{y}=2 \sin t$. The angle between $F$ and $p$ at time $t$ is

A bicycle is in motion. The frictional force exerted by the ground on the two wheels acts

$L, C $ and $R$ represent physical quantities inductance, capacitance and resistance respectively. The combination representing dimension of frequency is

Dimension of electrical resistance is

Cyclotron is a device which is used to

Consider a car moving on a straight road with a speed of $100\, m/s$. The distance at which car can be stopped, is : $[\mu_k = 0.5]$

Assuming earth to be sphere of uniform density what is the value of acceleration due to gravity at a point $100\, km$ below the earth surface (Given $R=6380\,\times 10^{3}\,m$)

The clouds in sky generally appear to be whitish. Diffraction due to clouds is efficient in equal measure at all wavelengths.

Specific gravity of a fluid is a dimensionless quantity. It is the ratio of density of fluid to the density of water.

An astronomical telescope has two lenses of focal powers $0.5\, D$ and $20\, D$. Then its magnifying power will be :

An annular ring with inner and outer radii $R_1$ and $R_2$ is rolling without slipping with a uniform angular speed. The ratio of the forces experienced by the two particles situated on the inner and outer parts of the ring, $\frac{F_{1}}{F_{2}}$ is :

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity, then :

A thin glass (refractive index 1.5) lens has optical power of $- 5\, D$ in air. Its optical power in a liquid medium with refractive index 1.6 will be :

A steel scale measures the length of a copper wire as $80.0\, cm$, when both are at $20^{\circ} C$, the calibration temperature for the scale. What would the scale read for the length of the rod when both are at $40^{\circ} C ?$ Given: $\alpha$ for steel $=11 \times 10^{-6}$ per ${ }^{\circ} C$ and $\alpha$ for $Cu =11 \times 10^{-6} \text{per} ^{\circ} C$

A solid sphere is rolling on a frictionless surface, shown in figure with a translational velocity $v\, m/s$. If it is to climb the inclined surface then $v$ should be

In a semiconductor diode, the barrier potential offers opposition to only:

A parachutist after bailing out falls $50\, m$ without friction. When parachute opens, it decelerates at $2\,m/s^2$. He reaches the ground with a speed of $3 \,m/s$. At what height, did he bail out ?

A packet is dropped from a balloon which is going upwards with the velocity $12\, m$ $s^{-1}$, the velocity of the packet after 2 s will be

A nuclei $X$ with mass number $A$ and charge number $Z$, disintegrates into one $\alpha$-particle and one $\beta$-particle. The resulting nuclide $R$ has atomic mass and atomic number, equal to :

A moving coil galvanometer has $150$ equal divisions. Its current sensitivity is $10$ divisions per milliampere and voltage sensitivity is $2$ divisions per millivolt. In order that each division reads $1 V$, the resistance in Ohm?s needed to be connected in series with the coil will be :

A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is

A ladder is leaned against a smooth wall and it is allowed to slip on a frictionless floor. Which figure represents trace of its centre of mass.