List of practice Questions

Fluid mosaic model of plasma membrane was proposed by

Borax is

Two coherent monochromatic; light beams of intensities $I$ and $4I$ are superposed. Intensities at constructive and? destructive interferenc positions will be

Which of the following overlaps leads to bonding?

A Carnot engine whose low temperature reservoir is at $ 7^??, C $ has an efficiency of $ 50\% $ . It is desired to increase the efficiency to $ 70\% $ . By how many degrees should the temperature of the high temperature reservoir be increased ?

In Young?? double slit experiment, the slits are $ 3 \,mm $ apart. The wavelength of light used is $ 5000\, ??$ and the distance between the slits and the screen is $ 90 \,cm $ . The fringe width in $ mm $ is :

A circular disc of radius $ R $ rolls without slipping along the horizontal surface with constant velocity $ v_0 $ . We consider a point $ A $ on the surface of the disc. Then the acceleration of the point $ A $ is :

A moving coil galvanometer has a resistance of $ 10\, O $ and full scale deflection of $ 0.01\, A $ . It can be converted into voltmeter of $ 10\, V $ full scale by connecting into resistance of :

The number of free electrons per $ 100 \,mm $ of ordinary copper wire is $ 2 ??10^{21} $ . Average drift speed of electrons is $ 0.25\, mm/s $ . The current flowing is :

Find the dimensions of electric permittivity.

$ 1\,Wb/m^2 $ is equal to :

Which of the following statement is wrong?

$ Cis-trans $ isomers generally:

Wurtz's reaction involves'the reduction of alkyl halide with:

The two optical isomers given below, namely, :

The coagulating power of an electrolyte for arsenious sulphide decreases in the order:

Radioactive decay series of uranium is denoted as:

In one of the following reactions $ \text{HN}{{\text{O}}_{\text{3}}} $ does not behave as an oxidizing agent. Identify it:

Conversion of benzaldehyde to 3-phenyl-prop-2-en-1-oic acid is:

A person is standing in an elevator. In which situation he finds his weight less?

The radius of sphere is measured to be $ (2.1\,\pm \,0.5)\,cm. $ Calculate its surface area with error limits:

If linear density of a rod of length 3 m varies as $ \lambda =2+x, $ then the position of the centre of gravity of the rod is:

A block of mass $m$ initially at rest is dropped from a height $h$ on to a spring of force constant $k$. The maximum compression in the spring is $x$ then:

The dimensional formula for the gravitational constant is:

A particle is moving in a circle of radius R with constant speed v. If radius is doubled, then its centripetal force to keep the same speed gets: