List of practice Questions

If $ a, b $ and $ c$ are distinct positive numbers, then the expression $(b + c - a ) (c+ a - 6) (a + b - c) - abc$ is
The reaction which proceed in the forward direction is
A microammeter has a resistance of $100 \Omega$ and full scale range of $50 \mu A$. It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination (s)
The product of n positive numbers is unity, then their sum is
Two trains move towards each other with the same speed. The speed of sound is 340 m/s. If the height of the tone of the whistle of one of them heard on the other changes to 9/8 times, then the speed of each train should be
Natural rubber is a polymer of
SI unit of magnetic field is
Ribosomes were discovered by
Photoelectric work function of a metal is 1 eV. Light of wavelength $? = 3000\, \mathring{A}$ falls on it. The photo electrons come out with a maximum velocity
Pancreas produces
Mineral associated with cytochrome is
As the atomic number of halogens increases the halogens
AgCl dissolves in $NH_4OH$ due to the formation of
Commercial cork is obtained from:
Which of the following is the most stable carbocation (carbonium ion)?
Vegetative reproduction of Agave occurs through
Isomers of a substance must have the same
Glass is a
Domestic waste constitutes
Two identical straight wires are stretched so as to produce 6 beats/s when vibrating simultaneously. On changing the tension slightly in one of them, the beat frequency remains unchanged. Denoting by $T_1,T_2$ the higher and the lower initial tension in the strings, then it could be said that while making the above changes in tension
A uniform bar of length 6 a and mass 8 m lies on a smooth horizontal table. Two point masses m and 2m moving in the same horizontal plane with speed 2vand v respectively, strike the bar [as shown in the figure] and stick to the bar after collision. Denoting angular velocity (about the centre of mass), total energy and centre of mass velocity by $?$, E and $v_c$ respectively, we have after collision
There is no S- S bond in
The reagents, $NH_4Cl$ and aqueous $NH_3$ will precipitate
According to kinetic theory of gases, for a diatomic molecule
1 -chlorobutane on reaction with alcoholic potash gives