List of practice Questions

The extinct humans who lived $1,00,000$ to $40,000$ years ago, in East and Central Asia, used hides to protect their bodies and had brain capacity of $1400 \,c.c.$ were
The exotic species, which when introduced in India became notorious weed, is
The expanded form of $DDT$ is
The exponential growth can be expressed as W = We. What is 'r' in the expression ?
The expression for the induced emf contains a negative sign $\left( \xi=-\frac{d\phi}{dt}\right)$. The significance of the negative sign is given by the statement
The escape velocity of a body from the earth depends on (i) the mass of the body. (ii) the location from where it is projected. (iii) the direction of projection. (iv) the height of the location from where the body is launched.
The essential conditions for observing Fresnel class of diffraction is
The example of heteropolar sol. is
The excluded volume per molecule of a gas is ________ times the actual volume of the gas molecule
The escape velocity of a body depends upon its mass as
The energy yield as a result of total oxidation of one glucose molecule during cellular respiration is to convert
The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283 $kJ mol^{-1}$ respectively. The enthalpy of formation of carbon monoxide per mole is
The electrostatic potential inside a charged spherical ball is given by $\phi = ar^2 + b$ where r is the distance from the centre a, b are constants. Then the charge density inside the ball is
The end product of anaerobic respiration, in plants is
The electric field strength due to a circular loop of charge of radius $R$ and linear density of charge $\lambda$ at its centre is proportional to :
The electrical conductivity of semiconductors :
The electronic configuration of four atoms are given in brackets: $L\left(1s^{2} 2s^{2} 2p^{1}\right); $ $M\left(1s^{2} 2s^{2} 2p^{5}\right); $ $Q\left(1s^{2} 2s^{2} 2p^{6} 3s^{1}\right); $ $R\left(1s^{2} 2s^{2} 2p^{2}\right);$ The element that would most readily form a diatomic molecule is
The electric field components in the given figure are $E_x = \alpha x^{1/2}$, $E_y = E_z = 0$ in which $\alpha = 800\, N\, C^{-1}\, m^{-1/2}$. The charge within the cube if net flux through the cube is $1.05\, N\, m^2\,C^{-1}$ (assume $a = 0.1\, m$)
The electric field intensity at a point $P$ due to point charge $q$ kept at point $Q$ is $24 \,N \,C^{-1}$ and the electric potential at point $P$ due to same charge is $12\, J \,C^{-1}$. The order of magnitude of charge $q$ is
The electric field strength at a distance r from a charge q is E. What will be electric field strength if the distance of the observation point is increased to 2 r?
The effective atomic number of Fe in $Fe(CO)_5$ is
The electric charge, in uniform motion, produces
The electric current passing through a metallic wire produces heat because of
The eccentricity of the ellipse $ 25x^2 + 9y^2- 150x - 90y - 225 = 0$ is
The edge length of the unit cell of $NaCl$ crystal lattice is 5.623 ?, density is 2.16 $g cm^{-3}$ and the molar mass of $NaCl$ is $58.5\, g$ $mol^{-1}$. The number of moles per unit cell is