List of top Physics Questions

250 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m then the load is lifted to 3m, the efficiency of pulley system will be : -
Which of the following electromagnetic radiations have the longest wavelength ?
A black body has maximum wavelength 1 m at 2000 K. Its corresponding wavelength at 3000 K will be
A batsman hits back a ball straight in the direction of the bowler without changing its initial speed of $12 ms^{-1}$. If the mass of the ball is 0.15 kg, the imparted to the ball is
The average binding energy of a nucleon inside an atomic nucleus is about
The de Broglie wave corresponding to a particle of mass m and velocity v has a wavelength associated with it
If the amplitude of sound is doubled and the frequency reduced to one fourth, the intensity of sound at the same point will be
The dimensional formula of torque is
For a satellite escape velocity is 11 km/s. If the satellite is launched at an angle of 60$^{\circ}$ with the vertical, then escape velocity will be
A bus is moving on a straight road towards north with a uniform speed of 50 km/hour then it turns left through 90$^{\circ}$. If the speed remains unchanged after turning, the increase in the velocity of bus in the turning process is
Curie is a unit of
Dimensional formula of self inductance is
A $5.5$ metre length of string has a mass of $0.035 \,kg$. If the tension in the string in $77\, N$, the speed of a wave on the string is
A small object of uniform density rolls up a curved surface with an initial velocity v. It reaches up to a maximum height of $\frac{3v^2}{4g}$ with respect to the initial position. The object is
To convert a galvanometer into a voltmeter one should connect a
Of the following quantities, which one has dimensions different from the remaining three ?
When n type semiconductor is heated
Two identical p-n junctions may be connected in series with a battery in three ways . The potential drops across the two p-n junctions are equal in
Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to $ R^{-5/2} $ , then
For an ideal gas
Energy in a current carrying coil is stored in the form of
A solid cylinder of mass $M$ and radius $R$ rolls without slipping down an inclined plane of length $L$ and height $h$. What is the speed of its centre of mass when the cylinder reaches its bottom -
The impurity atoms with which pure silicon should be doped to make a p-type semiconductor are those of
A car is moving along a straight road with a uniform acceleration. It passes through two points P and Q separated by a distance with velocity 30 km/ h and 40 km/h respectively. The velocity of the car midway between P and Q is
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation