Basic Science T...

A beta particle is a fast-moving electron. Which statement explains how beta particles are emitted from an atom?

The unit of expression $$\mu_{0} \varepsilon_{0} $$ are :-

A disc is rotating about its own axis with angular frequency 100 rpm. When a mass of 100 g is placed at 10 cm from its centre then its angular frequency becomes 50 rpm. The moment of inertia of the disc is-

The least count of stop watch is $$\dfrac{1}{5}$$ second.The time of $$20$$ oscillations of a pendulum is measured to be $$25$$ seconds. The maximum percentage error in the measurement of time will be

A rod of length L and mass M is bent to semicircular ring as shown in the following figure the moment of inertia about XY is 

A researcher found petrified dinosaur faces. Which one of the following is unlikely to be found in this fossil?

A crate is initially at rest on a horizontal frictionless table A constant horizontal force F is applied  which of the following four graphs is a correct plot of work W as a function of the crate's speed V ?

The acceleration of a particle oscillating simple harmonically at distance $$ x_1 $$ and $$ x_2 $$ from the mean position are $$ a_1$$ and $$ a_2 $$ respectively  then the period of oscillation is 

$$I$$ is moment of inertia of a thin circular ring about an axis perpendicular to the plane of ring and passing through its centre. The same ring is folded into 2 turns coil. The moment of inertia of circular coil about an axis perpendicular to the plane of coil and passing through its centre is

In a new system of units, the unit of mass equals $$\alpha$$ kg, the unit of length equals $$\beta$$ m and unit of time equals $$\gamma$$ second. The value of 1 newton in this new system of units is