List of top Physics Questions

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.
A horizontal platform is rotating with uniform angular velocity around the vertical axis passing through its center. At some instant of time a viscous fluid of mass $m$ is dropped at the center and is allowed to spread out and finally fall. The angular velocity during this period
A hot electric iron has a resistance of $80\, \Omega$ and is used on a $200\, V$ source. The electrical energy spent, if it is used for $2\, hr$, will be :
Two radioactive substances $A$ and $B$ have decay constants 5 $\lambda$, and $\lambda$ respectively. At $t\, =\, 0$, they have the same number of nuclei. The ratio of number of nuclei of $A$ to those of $B$ will be $(1/e^2)$ after a time
The angular speed of a body changes from $\omega_1$ to $ \omega_2$ without applying a torque, but due to change in moment of inertia. The ratio of radii of gyration in the two cases is
If both the mass and radius of earth decrease by $1\%$, the value of (I) acceleration due to gravity would increase by $1\%$ (II) acceleration due to gravity would decrease by $1\%$ (III) escape velocity from earth's surface would decrease by $1 \%$ (IV) the gravitational potential energy of a body on earth's surface will remain unchanged
A small body of mass $m$ slides without friction from the top of a hemisphere of radius $r$. At what height will the body be detached from the centre of the hemisphere?
The objectives with large apertures are used in telescopes for
How long will a passenger sitting at the window of a train travelling at a speed of 54 km$h^{-1}$ see a train,passing by in the opposite direction with a speed of 36 km$h^{-1}$ , if the length of the second train is 150 m?
If a, b, c and d are mass, length, time and current respectively, then $b^2 \, a/ c^3$ d has the dimensions of
A faulty thermometer has its fixed point marked as $5^{\circ}$ and $95^{\circ}$. The temperature of a body as measured by the faulty thermometer is $59^{\circ}$. The correct temperature of the body on Celsius scale is
A conducting ring of radius $1\, m$ is placed in an uniform magnetic field $B$ of $0.01\, T$ oscillating with frequency $100\, Hz$ with its plane at right angle to $B$. What will be the induced electric field?
A concave mirror of focal length $15\, cm$ forms an image having twice the linear dimension of the object. The position of the object when the image is virtual will be:
A candle of diameter $d$ is floating on a liquid in a cylindrical container of diameter $D (D > > d)$ as shown in figure. If it is burning at the rate of $2$ cm/hour then the top of the candle will
A satellite launch station should be
A bullet is fired from the gun with a speed of 1000 $ms^{ -1}$ in order to hit a target s = 100 m away. At what height above the target should by gun be aimed? (The resistance of air is neglegible and g = 10 $ ms^{ - 2}$
A body of mass m is accelerated uniformly from rest to a speed $v$ in a time $T$. The instantaneous power delivered to the body as a function of time, is given by :
At the height $80\, m$ , an aeroplane is moved with $150\,m/s$. A bomb is dropped from it so as to hit a target. At what distance from the target should the bomb be dropped? (given $g=10\,m/s^{2}$)
A stone thrown at an angle $ \theta $ to the horizontal reaches a maximum height $H$ . Then the time of flight of stone will be
Near and far points of human eye are
An object accelerates from rest to a velocity $27.5\,m/s $ in $10\,\sec $ then the distance covered in next $ 10\,\sec$ is
A man having height $6\, m$, observes image of $2\, m$ height erect, then mirror used is
A body is moving along a rough horizontal surface with an initial velocity $6\, ms^{-1}$ If the body comes to rest after travelling a distance $9\, m$, then the coefficient of sliding friction will be