Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
Transfer characteristics [output voltage ($V_o$) vs input voltage ($V_i$)] for a base biased transistor in CE configurations are as shown in the figure. For using the transistor as a switch, it is used:
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:
The moment of inertia of a uniform circular disc is maximum about an axis perpendicular to the disc and passing through:
If $\vec{F}$ is the force acting on a particle having position vector $\vec{r}$ and $\vec{\tau}$ be the torque of this force about the origin, then:
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 sample of $0.1 \text{ g}$ of water at $100^{\circ}\text{C}$ and normal pressure ($1.013 \times 10^5 \text{ N m}^{-2}$) requires $54 \text{ cal}$ of heat energy to convert it into steam at $100^{\circ}\text{C}$. If the volume of the steam produced is $167.1 \text{ cc}$, then the change in internal energy of the sample will be:
A Carnot engine whose sink is at $300 \text{ K}$ has an efficiency of $40\%$. By how much should the temperature of the source be increased to increase its efficiency by $50\%$ of its original efficiency?
The catalytic activity of transition metals is due to:
Ratio of total kinetic energy and rotational kinetic energy in the motion of a disc is:
Three masses are placed on the x-axis: $300 \text{ g}$ at the origin, $500 \text{ g}$ at $x = 40 \text{ cm}$, and $400 \text{ g}$ at $x = 70 \text{ cm}$. The distance of the center of mass from the origin is:
A black body is at $727^\circ\text{C}$. The rate at which it emits energy is proportional to:
Thermodynamic processes are indicated in the following diagram. Match the following: Column I P. Process I Q. Process II R. Process III S. Process IV Column II a. Adiabatic b. Isobaric c. Isochoric d. Isothermal
Two bodies with kinetic energies in the ratio of $4 : 1$ are moving with equal linear momentum. The ratio of their masses is:
The angular speed of the wheel of a vehicle is increased from $360 \text{ rpm}$ to $1200 \text{ rpm}$ in $14 \text{ seconds}$. Its angular acceleration will be:
An object kept in a large room having an air temperature of $25^\circ \text{C}$ takes $12 \text{ min}$ to cool from $80^\circ \text{C}$ to $70^\circ \text{C}$. The time taken to cool for the same object from $70^\circ \text{C}$ to $60^\circ \text{C}$ would be nearly:
The temperature inside a refrigerator is $t_2^\circ\text{C}$ and the room temperature is $t_1^\circ\text{C}$. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be:
The ratio of the moments of inertia of two spheres, about their diameters, having the same mass and their radii being in the ratio of $1:2$, is:
The coefficient of linear expansion of brass and steel rods are $\alpha_1$ and $\alpha_2$. Lengths of brass and steel rods are $L_1$ and $L_2$ respectively. If $(L_2-L_1)$ remains the same at all temperatures, which one of the following relations holds good?
If the cold junction of a thermocouple is kept at $0^\circ\text{C}$ and the hot junction is kept at $T^\circ\text{C}$, then the relation between neutral temperature ($T_n$) and temperature of inversion ($T_i$) is:
Identify the correct reagents that would bring about the following transformation (Alkene $\rightarrow$ Alcohol):