List of top Physics Questions

As the temperature is increased, the time period of a pendulum
As the depth of the river increases, the velocity of flow
As a result of change in the magnetic flux linked to the closed loop shown in figure, an emf, $V$ volt is induced in the loop. The work done (in joule) in taking a charge $q$ coulomb once along the loop is
Arrange 1 light year (ly), 1 astronomical unit (AU) and 1 parallactic second (par sec) in descending order
Arrange 1 slug, 1 chandershekhar limit (CSL) and 1 atomic mass unit (amu) in ascending order.
Angle between the plane of vibration and plane of polarization is
Analogue of mass in rotational motion is
An object is projected in x-y plane from the origin at t=0 and its velocity changes according to relation $\bar{v} = a\hat{i}+bx\hat{j}$. Equation of path of particle is
An object is moving towards a concave mirror of length 24 cm. When it is at a distance of 60 cm from the mirror its speed is 9cm/s, the speed of its image at that instantis
An object of mass $40\, kg$ and having velocity $ 4\, m s^{-1}$ collides with another object of mass $60\, kg$ having velocity $ 2 \,ms^{-1}$. The loss of energy when the collision is perfectly inelastic
An $n-p-n$ transistor in a common-emitter mode is used as a simple voltage-amplifier with a collector- current of $4 \,mA$. The terminals of a $8\, V$ battery is connected to the collector through a load-resistance $R_L$ and to the base through a resistance $R_B$. The collector-emitter voltage $V_{CE} = 4 \,V$, the base-emitter voltage $V_{BE} = 0.6 \,V$ and the current amplification factor $\beta_{dc} = 100$. Then
An n-type semiconductor is formed
An object is gently placed on a long conveyer belt moving with a speed of $5 \,m \,s^{-1}$. If the coefficient of friction between the block and the belt is $0.5$ the block will slide on the belt up to a distance (Take $g = 10\, m\, s^{-2}$)
An LCR series circuit containing a resistance of $120\Omega$ has angular resonance frequency $4\times 10^5$ rad $S^{-1}$. At resonance the voltage across resistance and inductance are 60V and 40V respectively. Then the values of L agd C are respectively
An iron block of sides $50\, cm$ $\times 8 \,cm$ $\times15 \,cm$ has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is
An $LC$ circuit contains a $20\,mH$ inductor and a $50\, \mu F$ capacitor with an initial charge of $10\, mC$. The resistance of the circuit is negligible. Let the instant at which the circuit which is closed be $t = 0$. At what time the energy stored is completely magnetic?
An insect trapped in a circular groove of radius $12\,cm$ moves along the groove steadily and completes $7$ revolutions in $100\,s$. The linear speed of the insect is
An infinitely long rod lies along the axis of a concave mirror of focal length . The near end of the rod is a fa distance $u > f$ from the mirror. Its image will have a length
An inductor of inductance L and resistor of resistance R are joined in series and connected by a source of frequency $\omega$. Power dissipated in the circuit is
An inductor of inductance L = 400 mH and resistors of resistance $R_1=4\Omega$ and $R_1=4\Omega$ are connected to battery of emf 12V as shown in the figure. The internal resistance of the battery is negligible. The swich S is closed at t = 0. The potential drop across L , as a function of time is
An inductor of $30\,mH$ is connected to a $220\,V$, $100\,Hz$ ac source. The inductive reactance is
An ideal gas is trapped between Hg thread of 12cm and the closed lower end of a narrow vertical tube of uniform cross section. Length of the air column is 20.5cm. When the open end is kept upward. If the tube is making $30^{\circ} $ with the horizontal then the length of the air column is (assuming temperature to be constant and atmospheric pressure = 76cm of Hg)
An ice cube of mass $0.1 \,kg$ at $0^{\circ}C$ is placed in an isolated container which is at $227^{\circ}C$. The specific heat s of the container varies with temperature $T$ according to the empirical relation $s = A + BT$, where $A = 100\, cal\, kg^{-1}\, K^{-1}$ and $B = 2 \times 10^{-2}\, cal\, kg^{-1}$. If the final temperature of the container is $27^{\circ}C$, the mass of the container is (Latent heat of fusion of water $= 8 \times 10^4\, cal\, kg^{-1}$, specific heat of water $= 10^3\,cal\, kg^{-1}\, K^{-1}$)
An element X decays first by positron emission and then two ?-particles are emitted in successive radioactive decay. If the product nucleus has mass number 227 and atomic number 89, the mass number and atomic number of element X are
An elevator which can carry a maximum load of $ 1800 \,kg $ (elevator + passengers) is moving up with a constant speed of $ 2\, ms^{-1} $ . The frictional force opposing the motion is $ 4000\, N $ . What is minimum power delivered by the motor to the elevator?