List of top Physics Questions

Two identical springs of each having force constant $\frac{k}{3}$ are connected as shown in the figure. If it executes simple harmonic motion, its time period is:

The workdone by a gas of one mole at constant temperature of $27^\circ\text{C}$ when its volume doubled is (Take $\log_{10} 2 = 0.3010$ and Universal gas constant $R = 8.314\text{ J mol}^{-1}\text{ K}^{-1}$):

A Celsius and a Fahrenheit thermometers are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers $131^\circ$. The fall in temperature as registered by the Celsius thermometer is:

When light of wavelength $\lambda$ incidents on a single slit of width 'a', then the angular width between the third order diffraction maxima on either side of the central maximum is:

In the pfund series of hydrogen spectrum, the wavelength of first spectral line is (Rydberg constant = 1.097 $\times 10^7$ m$^{-1}$)

Match the following, if $X_{\text{L}}$ and $X_{\text{C}}$ are inductive and capacitive reactances respectively:

Ten resistors, each having resistance of $6\text{ }\Omega$, are connected in a circuit. Then the ratio of maximum current to the minimum current that can flow through the circuit is:

A bomber plane moves horizontally with a speed of $500\text{ ms}^{-1}$ and a bomb released from it strikes the ground in $10\text{ sec}$. Angle with which it strikes the ground will be ($g = 10\text{ ms}^{-2}$):

Work done in assembling two identical charges each having a charge 'q', separated by a distance $r$ is:

An amplitude modulated wave is represented by $C_m(t) = 30 \sin 300\pi t + 10(\cos 200\pi t - \cos 400\pi t)$. Then the carrier wave frequency, signal frequency and modulation index are respectively

If the absolute temperature of the source of a Carnot's engine is changed from $T_1$ to $T_2$, its efficiency increases from $0.25$ to $0.4$. If the temperature of the sink is constant, then the ratio of $T_1$ and $T_2$ is:

The following circuit represents the logic gate

A uniform chain of length 'L' and mass 'M' overhangs a horizontal table with its two-third part on the table. The coefficient of friction between the table and the chain is $\mu$. The work done by friction during the period the chain slips off the table is:

A wire of length $1\text{ m}$ is broken into two unequal parts $P$ and $Q$. Part $P$ is extended to double its length so that its resistance become equal to resistance of $Q$. The length of $Q$ part is:

The coefficient of mutual induction between the primary and secondary coil of a transformer is $0.4\text{ H}$. When the current in the primary coil changes at the rate of $10\text{ As}^{-1}$, then the induced emf in the secondary will be:

A damped oscillation is subjected to a damping force of $F_d = -b V$, where 'V' is the velocity of the oscillator and 'b' is the damping constant. The angular velocity of the damped oscillator is ($k$ - force constant and $m$ - mass of the oscillator):

The surface charge density of an isolated sphere A of radius $2\text{ cm}$ having a charge of $+10\text{ }\mu\text{C}$ is twice the surface charge density of another sphere B of radius $3\text{ cm}$. If the two spheres are joined and then separated, the charges on the sphere A and B after separation are respectively:

A source of sound and an observer are moving each with a speed of $10\%$ of the speed of sound in air. If the frequency of sound heard by the observer when they approach each other is $400\text{ Hz}$ more than the frequency of sound heard by the observer when they move away from each other, then the frequency of the source of sound is:

A uniform solid cylinder of mass $m$ and radius $R$ is pulled along a horizontal smooth road by a horizontal force $F$ applied at its center of mass. If the cylinder rolls without slipping, the angular acceleration $\alpha$ of the cylinder is:

An object placed in front of a concave mirror at a distance of $x\text{ cm}$ from the pole gives a 3 times magnified real image. If it is moved to a distance of $(x + 5)\text{ cm}$, the magnification of the image becomes 2. The focal length of the mirror is:

A force of $250\text{ N}$ is required to lift a mass of $75\text{ kg}$ through a pulley system. In order to lift this mass through $3\text{ m}$, the rope has to be pulled through $12\text{ m}$. The efficiency of the system is:

A loaded bus and an unloaded bus are both moving with the same kinetic energy. The mass of the former is twice that of the later. Brakes are applied to both so as to exert equal retarding forces. If $S_1$ and $S_2$ are the distances covered by the two buses before coming to rest respectively, then:

Which one of the following laws is modified by Maxwell to obtain four electromagnetic equations known as Maxwell's equations?

A parallel plate capacitor is charged and then disconnected from the battery. If a dielectric slab is now inserted between the plates of the capacitor, the energy stored in the capacitor:

Magnetic field at $0.1\text{ m}$ from a long straight wire carrying $10\text{ A}$ current is: