List of practice Questions

Which of the following is not an air pollutant ?
What is potential of platinum wire dipped into a solution of 0.1 M in $ S{{n}^{2+}} $ and 0.01 M in $ S{{n}^{4+}}? $
A stationary body of mass m explodes into the three parts having masses in the ratio 1:3:3. The two fractions with equal masses move at right angles to each other with a velocity of $ 1.5\,m{{s}^{-1}}. $ The velocity of the third part is:
A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution?
If mammalian ovum fails to get fertilized, which one of the following is unlikely ?
With which of the given pairs CO$_2$ resembles in structure?
If a car at rest accelerates uniformly and attains a speed of $72 \,km/h$ in $10 \,s$, then it covers a distance of
In the reaction \(^2_1H+^3_1H\) \(\rightarrow\) \(^4_2He+^1_0n,\) if the binding energies of \(^2_1H\), \(^3_1H\) and \(^4_2He\) are respectively a, b and c (in MeV), then the energy (in MeV) released in this reaction is:
Which of the following processes is reversible?
A photosensitive metallic surface has work function, hv0. If photons of energy 2hv0 fall on this surface, the electrons come out with a maximum velocity of 4x106 m/s. When the photon energy is increased to 5hv0, then maximum velocity of photoelectrons will be:
The work functions for metals A,B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation, the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are:

A photon collides with a stationary hydrogen atom in the ground state inelastically. The energy of the colliding photon is 10.2 eV. After a time interval of the order of microseconds, another photon collides with the same hydrogen atom inelastically with an energy of 15 eV. What will be observed by the detector?

In contrast to annelids the platyhelminths show

A nuclide of an alkaline earth metal undergoes radioactive decay by emission of three αparticles in succession.The group of the periodic table to which the resulting daughter element would belong is:

Production of human protein in bacteria by genetic engineering is possible because
During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP ?
The deficiencies of micronutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport?
The main organelle involved in modification and outing of newly synthesized proteins to their destinations is
A very long straight wire carries a current $l$. At the instant when a charge +Q at point P has velocity $\overrightarrow{v}$, as shown, the force on the charge is
If the angle between the vectors $ \overrightarrow{A}$ and $ \overrightarrow{B}$ is $\theta, $ the value of the product $ ( \overrightarrow{B} \times \overrightarrow{A}) \cdot \overrightarrow{A}$ is equal to
A particle moves along Y-axis in such a way that its $ y- $ coordinate varies with time $ t $ according to the relation $ y=3+5t+7{{t}^{2}}. $ The initial velocity and acceleration of the particle are respectively:
$4.5\, g$ of aluminium (at. mass $27$ amu) is deposited at cathode from a molten electrolyte containing $Al^{3+}$ ions by a certain quantity of electric charge.The volume of hydrogen produced at STP from $H^+$ ions in a solution by the same quantity of electric charge will be
By keeping moment of inertia of a body constant, if we double the time period, then angular momentum of body
In series L-C-R circuit, the capacitance is changed from C to 2C. The inductance should be changed from L to ... to obtain same resonance frequency.
The path difference produced by two waves is 3.75 $\mu$m and the wavelength is 5000 $\mathring {A}$. The point is