List of top Physics Questions asked in UPSEE

A carnot engine takes 300 calories of heat at 500 K and rejects 150 calories of heat to the sink. The temperature of the sink is

A convex lens of focal length 10 cm and refractive index 1.5 is dipped in a liquid of refractive index 1.75. It will behave as

Two batteries of emf 6V and 3V with internal resistances $1 \Omega$ and $2\Omega$ respectively are connected as shown in figure. the potential difference across A and B is

Silicones are -

An achromatic combination of lens is formed by joining

The resolving power of telescope can be increased by

A metal surface of work function 3 eV is illuminated by photons of energy 2 eV. The kinetic energy of emitted photo-electrons will be

Two coherent monochromatic light beams of intensities ratio 1 : 4 are superposed. The ratio of maximum and minimum intensities in the resulting beam will be

Lenz?s law is consequence of the law of conservation of

The velocity of sound waves in a medium does not depend on

You are given an ammeter, a galvanometer and a voltmeter. From these, the device having maximum resistance is

Which of the following is not the property of laser beams?

The unit of self inductance is

The phase difference between two waves $x_1 = A \; \sin (\omega t + \frac{\pi}{6} )$ and $x_2 = A \cos \omega t $ is

The dimensional formula of Reynold?? number is same as

Displacement current is caused due to

When an unpolarised beam of light of intensity $I_0$ is incident on a polaroid, the intensity of transmitted light is

?Lumen? is the unit of

Two beams of red and violet colour are made to pass separately through a prism with angle of prism $60^{\circ}$. In the position of minimum deviation, the angle of refraction will be:

An eagle flies at constant velocity horizontally across the sky, carrying a mouse and releases the mouse while in flight. From the eagle?? perspective, the mouse falls vertically with speed $v_1$ . From an observer on the ground?? perspective, the mouse falls at an angle with speed $v_2$ . What is the speed of the eagle with respect to the observer on the ground ?

A stationary source (see figure) emits sound waves of frequency $f$ towards a stationary wall. If an observer moving with speed u in a direction perpendicular to the wall measures a frequency $f' = \frac{11}{8} f $ at the instant shown, then $u$ is related to the speed of sound $V_S$ as

A rectangular wire loop with length a and width b lies in the xy-plane as shown. Within the loop, there is a time dependent magnetic field given by $B = c [( x \cos \omega t ) \hat{ i }+( y \sin \omega t ) \hat{ k }]$ Here, $C$ and $\omega$ are constants. The magnitude of emf induced in the loop as a function of time is

The basic idea of MASER was first given by

Two SHM are represented by the equations $x_{1}=20 \sin \left[5 \pi t+\frac{\pi}{4}\right]$ and $x_{2}=10(\sin 5 \pi t+\sqrt{3} \cos 5 \pi t)$ The ratio of the amplitudes of the two motions is

A solid body rotates an angle $\theta$ about a stationary axis according to the law $\theta = 6t - 2t^3 $ .What is the mean value of angular velocity over the time interval between $t = 0$ and the time when the body comes to rest ?