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If the angular momentum of a body is found to be zero about a point , is it necessary that it will also be zero about a different point

The focal length of concave mirror is 20 cm. where should an object be placed to get an image magnified twice?

In the shown pulley-block system, strings are light. Pulleys are massless and smooth and system is released from rest. In $0.6$ second, what is the work done by gravity on $20\text{kg}$ and $10\text{kg}$ block respectively ?
Take $[g=10{\text{m/s}}^2]$

A man wants to reach point B on the opposite bank of a river flowing at a speed as shown in figure. What minimum speed relative to water should the man have so that he can reach point B? In which direction should he swim ?

If $y=3t^2-4t$, then minima of $y$ will be at

Statement 1-The graph between velocity v/s displacement of a praticle in a Rectilinear motion for which velocity is directly proportional to net force applied is a straight line

Statement 2- the velocity-displacement graph is straight line if slope of accelaration-time is zero.

A.Statement 1 and Statement 2 is true.Statement-2 is correct explanation for statement-1.

B.Statement 1 and Statement 2 is true.Statement-2 is not correct explanation for statement-1.

C.Statement 1 is false and Statement 2 is true.

D.Statement 1 is true and Statement 2 is false.

A varying horizontal force F=at acts on a block of mass m kept on a smooth horizontal surface. An identical block is kept on the first block. The coefficient of friction between the blocks is µ. The time after which relative sliding between the blocks prevails is:

(a) 2mg/a (b) 2µmg/a (c) µmg/a (d) 2µmga

The displacement of an object is "s" is given as a function of the time "t" .

If; "s"=5t²+9t, calculate the instantaneous velocity of object at "t"=0.

In order to double the frequency of the fundamental note emitted by a stretched string, the length is reduced to ${\left(\frac{3}{4}\right)}^{\text{th}}$ of the original length (mass per unit length remains same) and the tension is changed. The factor by which the tension is to be increased is

Radition coming from transition n = 2 to n =1 of hydrogen atoms falls on helium ions in n =1 and n =2 states. What are the possible transit ions of helium ions as they absorb energy from the radition ?

What is monochromatic radiation

A thin uniform rod of mass $10\text{kg}$ and length $6\text{m}$ is rotating about an axis perpendicular to its plane, passing through the midpoint of the rod. Find the moment of inertia of the rod about this axis.

A tank is filled with water upto a height $H$. Water is allowed to come out of a hole $P$ in one of the walls at a depth $h$ below the surface of water (see figure). Express the horizontal distance $X$ in terms of $H$ and $h$.

Wavelength of a 1 keV photon is $1.24\times {10}^{-9}m$. What is the frequency of 1 MeV photon

A car starts from rest and accelerates uniformly for 10 sec to a velocity of 8 m/s.it then runs at a constant velocity and is finally brought to rest in 64 meters with a constant retardation. The total distance covered by the car is 584 meters. Find the value of acceleration,retardation and total time taken.

The limiting values of modulation index () of an AM wave is

What is the dimensional formula for the universal constant of gravitation?

If heat is due kinetic energy of molecules then why heat is not felt when molecules move when we on fan

A ball can be projected from ground with a speed of $20\frac{m}{s}$. If we can project ball at different angles, then which of the following graph is correct for $Rvs\theta$?
( Take $g=10\frac{m}{s^2}$)

A body of mass 2 kg moving with a velocity of 3 m/sec collides head on with a body of mass 1 kg moving in opposite direction with a velocity of 4 m/sec. After collision, two bodies stick together and move with a common velocity which in m/sec is equal to

two Small bodies of masses 2.00 kg and 4.00 kg are kept at rest at a separation of 2.0 m. Where should a particle of mass 0.10 kg be placed to experience no net grvitational force from these bodies ? The particle is placed at this point. What is the gravitational potential energy of the system of three particles with usual referene level?

When is the object at rest?

Two identical metal plates show photoelectric effect by a light of wavelength ${\lambda }_A$ falls on plate A and ${\lambda }_B$ on plate B $({\lambda }_A=2{\lambda }_B)$. The maximum kinetic energy is

In a children - park an inclined plane is constructed with angle of incline ${45}^{\circ }$ in the middle part (figure 6-E1). Find the acceleration of a boy sliding on it, if the friction coefficient between the cloth of the o and the incline is 0.6 and g $=10m{s}^2$

A particle is projected at an angle ${30}^{\circ }$ with the horizontal at speed $20m/s$. How high will it strike a wall $8\sqrt{3}m$ away from point of projection?
$(g=10m/s^2)$

A ball is projected perpendicularly from an inclined plane of inclination $\theta$ from horizontal, with velocity ${}^{\prime }{u}^{\prime }$ as shown in figure. The time after which the projectile is making angle ${45}^{\circ }$ with the inclined plane is

$Iftan\alpha =\frac{5}{6}andtan\beta =\frac{1}{11},then$

A metre stick weighing 240 g is pivoted at its upped end in such a way that it can freely rotate in a vertical plane through this end (figure 10-E12). A particle of mass 100 g is attached to the upped end of the stick through a light string of length 1 m. Initially, the rod is kept vertical and the string horizontal when the system is released from rest. The particle collides with the lower end of the stick and sticks there. Find the maximum angle through which the stick will rise.

Plane microwaves are incidnet on a long slit having a width of 5.0 cm. Calculate the wavelength of the microwaves if the first diffraction m8inimum is formed at $\theta ={30}^{\circ }$

The wavelength of K-alpha characteristic x-rays only depends upon:

An electric dipole consists of a positive and negative charge of 4 μC. Each placed at a distance of 5 mm. The dipole moment for the system is

The magnitude of an electric field balancing a deutron of charge 1.6 x 10^-19 C and mass 3.2 x 10^-27 kg is:

Three vectors $\overrightarrow{P},\overrightarrow{Q}$ and $\overrightarrow{R}$ are such that $|\overrightarrow{P}|=|\overrightarrow{Q}|,|\overrightarrow{R}|=\sqrt{2}|\overrightarrow{P}|$ and $\overrightarrow{P}+\overrightarrow{Q}+\overrightarrow{R}=0$. The angle between $\overrightarrow{P}$ and $\overrightarrow{Q},\overrightarrow{Q}$ and $\overrightarrow{R}$, and $\overrightarrow{P}$ and $\overrightarrow{R}$ are

The motion of a particle along a straight line is described by the equation $x=6+27t-t^3$.
Find the time when $K.E$ of the particle is zero.

An organ pipe closed at one end has a fundamental frequency of $1500\text{Hz}$. The maximum number of overtones generated by this pipe which a normal person can hear is

A particle is projected with a velocity v so that its horizontal range twice the greatest height attained. The horizontal range is:

A mica strip and a polystyrene strip are fitted on the two slits of a double-slit apparatus. The thickness of the strips is 0.50 mm and the separation between the slits is 0.12 cm. The refractive index of mica and polystyrene are 1.58 and 1.55 respectively for the light of wavelength 590 nm which is used in the experiment. The interference is observed on a screen a distance of one meter away. (a) What would be the fringe width? (b) At what distance from the centre will the first maximum be located?

2 moles of an ideal monoatomic gas is expanded according to relation $PT$ = constant from its initial state $\left(P_0{V}_0\right)$ to the final state, due to which its pressure becomes half of the initial pressure. The change in internal energy is

At distance ‘r’ from a point charge, the ratio $\frac{u}{v^2}$ (where ‘u’ is energy density and ‘v’ is electric potential) is best represented by: