List of practice Questions

The average kinetic energy of a gas molecules at $27^{\circ} C$ is $6.21 \times 10^{-21} J$. Its average kinetic energy at $227^{\circ}C$ will be
A body is projected vertically upwards from the surface of a planet of radius $R$ with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is
A mirror forms a real image of unit magnification, Its nature is
Electric charges $+ 10\mu C, + 5\mu C, - 3 \mu C\, and\, + 8 \mu C$ are placed at the comers of a square of side $\sqrt2\,m$. The potential at the centre of the square (V) is
Magnetic field intensity at the centre of coil of 50 turns, radius 0.5 m and carrying a current of 2 A, is
The solubility of a saturated solution of calcium fluoride is $2 \times 10^{-4}$ moles per litre. Its solubility product is
Mean life of a radioactive element is one year. Then its half life is (in year)
Biaxial crystal among the following is
The number of atoms in a radioactive sample reduces from 1000 to 100 in two days. Then the number of atoms remaining at the end of four days is
The joint between atlas and axis is called
Ionisation energy of hydrogen atom is 13.6 eV. Then the energy required to ionise a hydrogen atom in which the electron is in the second orbit from the nucleus is (eV)
A convex lens of refractive index $n$ behaves as a convex lens of smaller power in a liquid of refractive index $n_1$ and as a concave lens in another liquid of refractive index $n_2$. Then relation between $n,n_1$ and $n_2$ is
Three similar cells, each of emf 2 V and internal resistance $r\,\Omega$ send the same current through an external resistance of $2\,\Omega$ when connected in series or in parallel. The strength of the current flowing through the external resistance is (A)
The specific heat of a metal is $0.16.$ Its approximate atomic weight would be
A hyphae which is multinucleated and asptate is known as:
Solder is an alloy of:
In the dichromate dianion
Principal, azimuthal and magnetic quantum numbers are respectively related to
Aquatic reptiles are
Temperature changes, in the environment, affect most of the animals which are
The canal system is a characteristic feature of
Which of the following is not found in birds?
Interference fringes are obtained using two coherent sources whose intensities are in the ratio 4 : 1. Then the ratio of the intensities of the bright and dark bands is
S.l. unit of surface tension is
A body of mass M kg initially at rest explodes into three fragments having masses in the ratio $ 3:1:1 $ . The two equal mass fragments fly off at right angles to each other with equal speed of 60 m/s. The speed of the heavier fragment is