List of practice Questions

Which of the following is a subgroup of the group $G = \{1, 2, 3, 4, 5, 6\}$ under $\otimes_7$ ?
The temperature of one mole of an ideal gas increases from 298 K when it absorbs 200 J of heat at constant volume. The change in the internal energy of the gas is
Which one of the following ores is obtained by floatation process?
Number of atoms in 560 $cm^3$ of oxygen at S.T.P. is
The volume of $CO_2$ (in $cm^3$) liberated at S.T.P. when 1.06 g of anhydrous sodium carbonate is treated with excess of dilute HCl is [atomic mass of Na= 23]
The heat of formation of $ {H_2O_{(l)}}$ is -286 kJ. The? heat of formation of $ { H_2O_{(g)}}$ is likely to be
An electron having spin quantum number, $s = -1/2$ and magnetic quantum number, $m = + 3$ can be present in
The atomic number of the element with highest ionization energy among the following is
The enthalpy of neutralization of HCI and NaOH is x kJ. The heat evolved when 500 ml of 2 N HCl is mixed with 250 mt of 4 N NaOH will be
For the dissociation of limestone in the slag zone of the blast furnace, the reaction is
100 mL of N/5 HCl was added to 1 g of pure $ {CaCO_3}$ What would remain after the reaction?
"Plum pudding" model of an atom was proposed by
A glass hemisphere of radius 0.1 cm and refractive index 1.5 is placed over a spot on a table and the spot is viewed from above. The spot appears to be
A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on it. If $\mu,$ between the wall? and the block is 0.5, the magnitude of the frictional force acting on the block is
In the case of the Bohr atom model, if $E_k$ and $U$ are the kinetic and potential energies of an electron in an orbit then,
If $x =at + bt^2$ where $x$ is measured in m and t ins, thenthe dimension of (b/a) is
A particle is moving eastward with velocity $5 \, m \, s^{-1}$ In 10 s the velocity changes to $5\, m\, s^{-1}$ northwards. The average acceleration in this time is
A mass of 0.1 kg is hung at the 20 cm mark from a 1 m rod weighing 0.25 kg pivoted at its centre. The rod will not topple if
A ring rolls down an inclined plane. The ratio of rotational kinetic energy to translational kinetic energy is
A particle executes simple harmonic motion with amplitude A. The distance moved by the particle in one oscillation is
The carrier of electromagnetic interaction is
The layer in earth's atmosphere which reflects radio waves from the earth thus, helping radio communication is

The vapor pressure of 

A body moves with uniform acceleration, then which of the following graph is correct? 

A wheel of radius \( R \) rolls on the ground with a uniform velocity \( v \). The relative acceleration of topmost point of the wheel with respect to the bottom most point is: