List of practice Questions

0.24 g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance ? (Density of $ H_2 = 0.089$)
The energy of a hydrogen atom in its ground state is - 13.6 eV. The energy of the level corresponding to the quantum number n = 2 in the hydrogen atom is
A moving body of mass $m$ and velocity $3\, km / hr$. Collides with a body at rest and of mass $2\, m$ and then sticks to it. Now the combined mass starts to move, then the combined velocity will be :
Benthoic animals are those, which
Cochineal insects have proved very useful for
The momentum of a particle having a de-Broglie wavelength of $10^{17}$ m is (Given, $h = 6.625 \times 10^{-34}$ m)
During dialysis
When npn transistor is used as an amplifier, then
BGA (blue green algae) are included in which of the following groups?
When 1500 ml air is in the lungs, it is called
A man fires a bullet of mass $200\,gm$ at a speed of $5\,m/s$. The gun is of one $kg$ mass. By what velocity the gun rebounds backward?
Which of the following is the direct ancestor of Homo sapiens?
Which of the following is the correct group of vestigial organs in man?
Choose the correct enzyme - substrate pair.
What will be the formula of mass of the earth in terms of g, R and G ?
A ball is dropped from a spacecraft revolving around the earth at a height of 120 km. What will happen to the ball?
The density of the material of a cube can be estimated by measuring its mass and the length of one of its sides. If the maximum error in the measurement of mass and length are 0.3% and 0.2% respectively, the maximum error in the estimation of the density of the cube is approximately
Nylon-66 is a polyamide obtained by the reaction of
An electron of mass m and charge e is accelerated from rest through a potential difference V in vacuum. Its final velocity will be
An element (atomic mass $100 \,g /\, mol$ ) having $BCC$ structure has unit cell edge $400\, pm$. The density of element is (No. of atom in $BCC ( Z )=2$ ).
Commonly used antiseptic -Dettol- is a mixture of
Which of the following has zero dipole moment?
A motor
At the mid point along the length of a long solenoid, the magnetic field is equal to x. If the length of the solenoid is doubled and the current is reduced to half, the field at the new mid point will be nearest to
$1000$ drops of water of radius $1\,cm$ each carrying a charge of $10\, esu$ combine to form a single drop. The capacitance of combined drop increases