List of top Physics Questions

The atomic number and mass number (M) of the nucleide formed when three alpha $ (\alpha ) $ and two beta $ (\beta ) $ particles are emitted from $ {{\,}_{\text{92}}}{{\text{U}}^{\text{238}}}\text{.} $

A monkey of mass $20\, kg$ is holding a vertical rope. The rope will not break when a mass of $25\, kg$ is suspended from it but will break if the mass exceeds $25\, kg.$ What is the maximum acceleration with which the monkey can climb up along the rope ? $(g = 10\, m/s^2)$

Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities $K$ and $2\, K,$ respectively. The equivalent thermal conductivity of the slab is

The molar heat capacity of water at constant pressure, $C$, is $75\, JK ^{-1}\, mol ^{-1}$. When $1.0\, KJ$ of heat is supplied to $100\, g$ of water which is free to expand, the increase in temperature of water is :

Solar energy is mainly caused due to

A nuclear reaction is given by,
 _ZX^A → _Z+1Y^A +_–1e⁰+\(\bar v\) represents 

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will

The time period of mass suspended from a spring is $T$. If the spring is cut into four equal parts and the same mass is suspended from one of the parts, then the new time period will be

Which of the following ray are not electromagnetic waves

If a ball is thrown vertically upwards with speed $u,$ the distance covered during the last $'t'$ seconds of its ascent is

The mass number of a nucleus is

The angular speed of the electric in the nth orbit of Bohr hydrogen atom is

A particle originally at rest at the highest point of a smooth circle in a vertical plane, is gently pushed and starts sliding/along the circle. It will leave the circle at $a'$ vertical distance $h$. below the highest point such that

A ball hangs from a string inside a train moving along a horizontal straight track. The string is observed to incline towards the rear of the train making a constant small angle with the vertical. It shows that the train is:

A plate has a length $ 5\pm 0.1\text{ }cm $ and breadth $ 2\pm 0.01\text{ }cm $ . Then the area of the plate is:

Two vectors are given by $\vec{A}=\left(3\hat{i} +\hat{j}+3\hat{k}\right)$ and $ \vec{B}=\left(3\hat{i} +5\hat{j}-2\hat{k}\right)$. Find the third vector $\vec{C}$ if $\vec{A}+3\vec{B}-\vec{C}=0.$

The current gain a of a transistor is $0.9.$ The transistor is connected to common base configuration. What would be the change in collector current when base current changes by $ 4\,mA $ ?

Two projectiles are fired at different angles with the same magnitude of velocity, such that they have the same range. At what angles they might have been projected?

In a full wave rectifier circuit operating from $ 50\,Hz $ main frequency, the fundamental frequency in the ripple would be

Consider the following statements A and B. Identify the correct answers. A. A zener diode is always connected in reverse bias. B. The potential barrier of a p-n junction lies between 0.1 to 0.3 V, approximately.

2 kg of ice at -20$^{\circ}$C is mixed with 5 kg of water at 20$^{\circ}$C in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg / $^{\circ}$C and 0.5 kcal/kg /$^{\circ}$C while the latent heat of fusion of ice is 80 kcal/kg

A sample of radioactive element has a mass of $10\, g$ at an instant $t = 0.$ The approximate mass of this element in the sample after two mean lives is

A particle moves along the $x$-axis from $x=x_{1}$ to $x=x_{2}$ under the action of a force given by $F=2 x$. Then the work done in the process is

According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature $T$ is proportional to