List of top Physics Questions asked in BITSAT

An alternating voltage $V(t) = 220 \sin 100\pi t$ volt is applied to a purely resistive load of $50\Omega$ . The time taken for the current to rise from half of the peak value to the peak value is:

The electrostatic force $\mathbf{F_1}$ and magnetic force $\mathbf{F_2}$ acting on a charge $q$ moving with velocity $v$ can be written as:

The speed of sound in oxygen at STP will be approximately:(Given, R = 8.3J $(K)^−1$ , $γ = 1.4)$

A parallel plate capacitor with plate area $A$ and plate separation $d = 2$ m has a capacitance of $4\mu F$ . The new capacitance of the system if half of the space between them is filled with a dielectric material of dielectric constant $K = 3$ (as shown in the figure) will be:

A long straight wire of radius $a$ carries a steady current $I$ . The current is uniformly distributed across its cross-section. The ratio of the magnetic field at $a/2$ and $2a$ from the axis of the wire is:

Electric potential at a point 'P' due to a point charge of $5 \times 10^{-9}$ C is 50 V. The distance of 'P' from the point charge is: (Assume,

\frac{1}{4\pi\epsilon_0} = 9 \times 10^{9} \, {Nm}^2{C}^{-2}

)

A rectangular loop of length $2.5$ m and width $2$ m is placed at $60^\circ$ to a magnetic field of $4$ T. The loop is removed from the field in $10$ sec. The average emf induced in the loop during this time is:

There are two long co-axial solenoids of the same length $l$ . The inner and outer coils have radii $r_1$ and $r_2$ and the number of turns per unit length $n_1$ and $n_2$ , respectively. The ratio of mutual inductance to the self-inductance of the inner coil is:

A particle of mass $m$ is projected with a velocity $u$ making an angle of $30^\circ$ with the horizontal. The magnitude of angular momentum of the projectile about the point of projection when the particle is at its maximum height $h$ is:

A force of $F = 0.5$ N is applied on the lower block as shown in the figure. The work done by the lower block on the upper block for a displacement of 3 m of the upper block with respect to the ground is (Take, $g = 10$ m/s $^2$ ):

A projectile is projected with velocity of $40$ m/s at an angle $\theta$ with the horizontal. If $R$ is the horizontal range covered by the projectile and after $t$ seconds its inclination with horizontal becomes zero, then the value of $\cot \theta$ is:
[Take,

g = 10

m/s

^2

]

The distance travelled by a particle starting from rest and moving with an acceleration $\frac{4}{3}$ ms $^{-2}$ , in the third second is:

An ideal massless spring $S$ can be compressed $1$ m by a force of $100$ N in equilibrium. The same spring is placed at the bottom of a frictionless inclined plane inclined at $30^\circ$ to the horizontal. A $10$ kg block $M$ is released from rest at the top of the incline and is brought to rest momentarily after compressing the spring by $2$ m. If $g = 10$ m/s $^2$ , what is the speed of the mass just before it touches the spring?

The range of a projectile projected at an angle of $15^\circ$ with the horizontal is $50$ m. If the projectile is projected with the same velocity at an angle of $45^\circ$ , then its range will be:

A rigid body rotates about a fixed axis with variable angular velocity $\omega = \alpha - \beta t$ at time $t$ , where $\alpha, \beta$ are constants. The angle through which it rotates before it stops is:

A block of mass 1 kg is pushed up a surface inclined to horizontal at an angle of $60^\circ$ by a force of 10 N parallel to the inclined surface. When the block is pushed up by 10 m along the inclined surface, the work done against frictional force is:

[Given: $g = 10$ m/s $^2$ , $\mu_s = 0.1$ ]

You measure two quantities as $A = 1.0 \,m \pm 0.2 \,m$ , $B = 2.0 \,m \pm 0.2 \,m$ . We should report the correct value for $\sqrt{AB}$ as:

A light string passing over a smooth light pulley connects two blocks of masses $m_1$ and $m_2$ (where $m_2>m_1$ ). If the acceleration of the system is $\frac{g}{\sqrt{2}}$ , then the ratio of the masses $\frac{m_1}{m_2}$ is:

A body is thrown with a velocity of $9.8$ m/s making an angle of $30^\circ$ with the horizontal. It will hit the ground after a time:

A person of mass $60$ kg is inside a lift of mass $940$ kg. The lift starts moving upwards with an acceleration of $1.0$ m/s $^2$ . If $g = 10$ m/s $^2$ , the tension in the supporting cable is:

A pendulum of mass $1$ kg and length $l = 1$ m is released from rest at an angle $\theta = 60^\circ$ . The power delivered by all the forces acting on the bob at angle $\theta = 30^\circ$ will be (Take, $g = 10$ m/s $^2$ ):

A gas can be taken from A to B via two different processes ACB and ADB. When path ACB is used, $60 J$ of heat flows into the system and $30 J$ of work is done by the system. If path ADB is used, the work done by the system is $10 J$ . The heat flow into the system in path ADB is:

Two wires of the same material (Young’s modulus $Y$ ) and same length $L$ but radii $R$ and $2R$ respectively, are joined end to end and a weight $W$ is suspended from the combination. The elastic potential energy in the system is:

Two vessels A and B are of the same size and are at the same temperature. A contains 1 g of hydrogen and B contains 1 g of oxygen. $P_A$ and $P_B$ are the pressures of the gases in A and B respectively, then $\frac{P_A}{P_B}$ is:

A solid metallic cube having total surface area $24 \, m^2$ is uniformly heated. If its temperature is increased by $10^\circ C$ , calculate the increase in volume of the cube.
% Given:

\alpha = 5.0 \times 10^{-4} \, C^{-1}