Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
The symbolic representation of four gates is shown as: Pick out which ones are for AND, NAND, and NOT gates, respectively.
In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an:
To get an output $Y = 1$ from the circuit shown below, the input must be:
A transistor is operated in a common emitter configuration at constant collector voltage $V_c = 1.5 \text{ V}$ such that a change in the base current from $100 \text{ } \mu\text{A}$ to $150 \text{ } \mu\text{A}$ produces a change in the collector current from $5 \text{ mA}$ to $10 \text{ mA}$. The current gain ($\beta$) is:
The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B, and C are as shown below. The logic circuit gate is:
Which of the following is an example of forward biasing?
For transistor action, which of the following statements is correct?
A logic circuit provides the output $Y$ as per the following truth table: $A \quad B \quad Y$ $0 \quad 0 \quad 1$ $0 \quad 1 \quad 0$ $1 \quad 0 \quad 1$ $1 \quad 1 \quad 0$ The expression for the output $Y$ is:
In a series LCR circuit, the inductance $L$ is 10 mH, capacitance $C$ is 1 $\mu$F and resistance $R$ is 100 $\Omega$. The frequency at which resonance occurs is
A thin rod of length $L$ and mass $M$ is bent at its midpoint into two halves so that the angle between them is $90^{\circ}$. The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is:
Which of the following statements are correct? (a) Centre of mass of a body always coincides with the centre of gravity of the body. (b) Centre of gravity of a body is the point about which the total gravitational torque on the body is zero. (c) A couple on a body produces both translational and rotational motion in a body. (d) Mechanical advantage greater than one means that small effort can be used to lift a large load.
A couple produces:
The temperature of a gas is $-50^{\circ}$C. To what temperature the gas should be heated so that the rms speed is increased by 3 times?
A particle moves along a circle of radius $\frac{20}{\pi} \text{ m}$ with constant tangential acceleration. If the velocity of the particle is $80 \text{ m/s}$ at the end of the second revolution after motion has begun, the tangential acceleration is:
Two particles that are initially at rest, move towards each other under the action of their mutual attraction. If their speeds are $v$ and $2v$ at any instant, then the speed of the centre of mass of the system will be:
The ratio of the radii of gyration of a circular disc to that of a circular ring, each of the same mass and radius, around their respective axes is:
A disc of radius $2 \text{ m}$ and mass $100 \text{ kg}$ rolls on a horizontal floor. Its centre of mass has a speed of $20 \text{ cm/s}$. How much work is needed to stop it?
A particle starting from rest moves in a circle of radius $r$. It attains a velocity of $v_0 \text{ m/s}$ on completion of $n$ rounds. Its angular acceleration will be:
A particle of mass $5m$ at rest suddenly breaks on its own into three fragments. Two fragments of mass $m$ each move along mutually perpendicular directions with speed $v$ each. The energy released during the process is:
In a diffraction pattern due to a single slit of width $a$, the first minimum is observed at an angle $30^\circ$ when light of wavelength $5000\text{ \AA}$ is incident on the slit. The first secondary maximum is observed at an angle of