List of practice Questions

$^{}_{92}U^{238}$ on absorbing a neutron goes over to $^{}_{92}U^{239} .$ This nucleus emits an electron to go over to neptunium which on further emitting an electron goes over to plutonium. The resulting plutonium can be expressed as.
96500 C electricity is passed through $CuSO_4$. The amount of copper precipitated is
Clouds appear to float in air due to
A small ball of density $\rho$ is immersed in a liquid of density $(\sigma > \rho)$ to a depth h and released. The height above the surface of water up to the ball will jump is
The S.I Unit of pressure is
8000 identical water drops combine together, to form a big drop. Then the ratio of the final surface energy to the initial surface energy of all the drops together is.
A body is dropped from a height of $4 \,m$ on a surface. If in collision $25\%$ of energy is lost, then the height upto which it will rise after collision is
If plane surface of a piano convex lens is silvered, then it will behave as a
The relationship between Young's modulus $Y$, bulk modulus $K$ and modulus of rigidity $\eta$ is
A closed iron ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is
Longitudinal wave can travel in
The number of $\alpha$-particles and $\beta$-particles respectively emitted in the reaction $ {_{88}A^{196} -> _{78}B^{164}}$
$\left(^{8}C_{1} - ^{8}C_{2} + ^{8}C_{3} -^{8}C_{4} + ^{8}C_{5} - ^{8}C_{6} +^{8}C_{7} - ^{8}C_{8}\right) $ equals:
A projectile is projected with speed $49\,ms^{-1}$ at an angle of $30^{\circ}$ with horizontal. The time taken by the projectile to reach the highest point is
Real gas behaves as an ideal gas, under which of the following conditions ?
The electrical conductivity of a semiconductor increases when electromagnetic radiation of wave length shorter than $2480\, nm$ is incident on it. The band gap (in $eV$) for semiconductor is
The potential difference across the collector of a transistor, used in common emitter mode is $1.5\, V$, with the collector resistance of $3\, k\Omega$, the emitter current is $[\beta = 50]$
8.2 L of an ideal gas weighs 9.0 g at 300 K and 1 atm. pressure. The molecular mass of gas is
Cyclosis or cytoplasmic streaming was discovered by
Particle present over 60S ribosome subunit which helps it to attach to surface of E.R. is
With janus Green, mitochondria turn
Cell wall layer lacking cellulose and containing xylans is
Cellulose of cell wall is synthesised by synthetase enzyme located over
Pili occur in
Tubule of endoplasmic reticulum present inside a plasmodesma is