List of top Physics Questions

In thermodynamic processes, which of the following statements is NOT true?

Closed and open organ pipes have same length. In first overtone, they produce four beats. If open pipe length is halved and closed pipe doubled, the beats in fundamental mode are

Quantities p, q, r, s are measured with errors 3%, 2%, 3% and 1%. $A = \frac{pq^{2}{r^{3}s}$. The percentage error in A is}

A man on a turn-table folds his arms. If his moment of inertia with folded arms is 75% of original, his rotational kinetic energy will

Kirchhoff's voltage law and current law are based (respectively) on the conservation of

The graph shows the variation of photocurrent with anode potential for four different radiations. If $I$ denotes intensity and $f$ denotes frequency, which of the following is correct?

A car moving at a speed 'V' is stopped in a certain distance with deceleration 'a'. If the speed of the car is 'nV', what must be the deceleration of the car to stop it in the same distance and in the same time?

The function of a dielectric in a capacitor is

A mass 'M' attached to a horizontal spring executes S.H.M. of amplitude $A_{1}$. When the mass M passes through its mean position, a smaller mass 'm' is placed over it and both move together with amplitude $A_{2}$. The ratio $(A_{1}/A_{2})$ is}

A radioactive element has rate of 8000 disintegrations per minute. After four minutes it becomes 2000 disintegrations per minute. The decay constant per minute is

A mass 'M' is suspended by a rope from a rigid support at point 'P'. Another rope is tied at end 'Q' and pulled horizontally with a force 'F'. If the rope makes an angle $\theta$ with vertical, then the tension in the string 'PQ' is

The polarising angle of transparent medium is $\theta$. Let the speed of light in the medium be $v$. Then the relation between $\theta$ and $v$ is ($c=$ velocity of light in air)

Two coils P and Q are kept near each other. When current in coil Q increases at the rate 10 $A/s$, the emf in coil P is 12 mV. When current of 1.5 A flows through coil P, the magnetic flux linked with coil Q in mWb is

For a transistor, $\alpha_{dc}$ and $\beta_{dc}$ are the current ratios, then the value of $\frac{\beta_{dc}-\alpha_{dc}}{\alpha_{dc}\times\beta_{dc}}$ is}

A black sphere has radius R whose rate of radiation is E at temperature T. If radius is made $R/2$ and temperature $3T$, the rate of radiation will be

A musical instrument P produce sound waves of frequency n and amplitude A. Another musical instrument produces sound waves of frequency $n/4$. The waves produced by P and Q have equal energies. If the amplitude of waves produced by P is $A_{p}$, the amplitude of waves produced by Q will be}

The plot of magnetic flux $\phi$ versus current I is shown for two inductors $L_{1}$ and $L_{2}$. The self inductance of}

A long rectangular conducting loop of width $l$, mass $m$ and resistance $R$ is placed partly in a perpendicular magnetic field $B$. It is pushed downwards with velocity $V$ so that it may continue to fall freely. The velocity $V$ is

In the following circuit, current through ACB if each resistance $R=4\Omega$ is

The depth at which acceleration due to gravity becomes $g/n$ is ($R=$ radius of earth, $g=$ acceleration due to gravity, $n=$ integer)

A particle is performing S.H.M. starting from extreme position. Displacement and acceleration have a phase difference of

Under isothermal conditions, two soap bubbles of radii $r_{1}$ and $r_{2}$ coalesce to form a big bubble. The radius of the big bubble is}

In a certain 2-inputs logic gate, when $A=0, B=0$, output $C=1$. When $A=0, B=1$, output $C=1$. The gate must be

Two cylinders A and B contain equal amounts of diatomic gas at T K. Piston A is free to move (isobaric), B is fixed (isochoric). If rise in temp of A is $dT_{A}$ for same heat $Q$, rise in B is}

The frequencies for series limit of Balmer and Paschen series are $v_{1}$ and $v_{3}$ respectively. If frequency of first line of Balmer series is $v_{2}$, then the relation is}