List of top Physics Questions

The speed of sound in a gas of density $\rho$ at a pressure $P$ is proportional to
The resultant of two forces acting at an angle of $120^{\circ}$ is $10\, kg$ wt and is perpendicular to one of the forces . That force is .......
The radius of gyration of a body about an axis at a distance of $6\, cm$ from its centre of mass is $10\, cm$. Then, its radius of gyration about a parallel axis through its centre of mass will be
A metal sphere cools at the rate of $ 3^{\circ} C/\min $ when its temperature is $ 50^{\circ} C $ . Its rate of cooling when its temperature is $ 40^{\circ} C $ and the temperature of surrounding is $ 25^{\circ} C $ is
The limbs of a U-tube are vertical and have internal diameters $0.5 \,cm$ and $1 \,cm$ respectively. If the tube contains water, what will be the difference in the surface level in the limbs? (Surface tension of water $= 72$ dyne/cm)
When the rate of emission of radiant heat from a body is less than the rate of absorption of radiant heat from surrounding then the temperature of body will
A spring scale is adjusted to read zero. Particles of mass 1 g fall on the pan of the scale and collide elastically and they rebound upward with the same speed. If the height of fall of panicles is 2 m and their rate of collision is 100 particles per second, then the scale reading in grams will be $ (g=9.8m/{{s}^{2}}) $
A smooth sphere of mass m moving with velocity u directly collides elastically with another sphere of mass M at rest. After collision their final velocities are V and v respectively. The value of v is
If a body travels half the distance with velocity $ {{v}_{1}} $ and the next half with velocity $ {{v}_{2}} $ its average velocity will be given by
The ratio of the numerical value of the average velocity and average speed of body is always
Which of the following is more close to a black body?
An astronomical telescope has a large aperture to
A thin rectangular magnet suspended freely has a period of oscillation equal to $T$. Now, it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. 1f its period of oscillation is $T'$, the ratio $T'/T$ is
Radius of $n^{th}$ orbit of $H$-like particles is proportional to
Heat absorbed by a mass of 1 g of helium, when its temperature rises from $ 11{}^\circ C $ to $ 131{}^\circ C $ at constant volume, is H. Heat absorbed by 7 g of nitrogen, when its temperature rises from $ 11{}^\circ C $ to $ 71{}^\circ C $ at constant volume, is $ {{H}_{N}} $ . The ratio of H to $ {{H}_{N}} $ is
Forces 5 N, 12 N and 13 N are in equilibrium. If $ sin\text{ }23{}^\circ =\frac{5}{13}, $ the angle between 5 N force and 13 N force is
A body moving with uniform acceleration describes 12 m in the third second of its motion and 20 m in the 5th second. Find the velocity after 10 th second.
A man slides down a light rope whose breaking strength is $ \eta $ times his weight. What should be his maximum acceleration so that the rope just not breaks?
By what percent the energy of a satellite has to be increased to shift it from an orbit of radius r to 3r?
The motor of an engine is rotating about its axis with an angular velocity of 100 rev/m. If conies to rest in 15s, after being switched off. Assuming constant angular deceleration. What are the numbers of revolutions made by it before coming to rest?
The dimension of $ \frac{P}{a} $ in the equation $ p=\frac{b-{{t}^{2}}}{ax} $ where p is pressure, $ x $ is distance and t is time are
When monochromatic red light is used instead of blue light in a convex lens, its focal length will :
What is the moment of inertia for a solid sphere w.r.t. a tangent touching to its surface?
What is the dimensions of magnetic field B in terms of C (= coulomb), M, L, T?
Water is flowing with velocity $4 \,m\,s^{-1}$ in a cylinder of diameter $8\,cm$, it is connected to a pipe with it end tip of diameter $2\,cm$, calculate the velocity of water at this free end.