List of practice Questions

Assertion (A): By mutations genetic variations are created resulting in a new trait not found in the parental type.
Reason (R): Plants having desirable characters will be selected after inducing mutations with chemicals or radiation.
At 27°C temperature and 770 mm pressure, 243 ml of a dry gas weighs 280 mg. Determine the molecular weight of the gas.
Identify the correct pair of variety crop developed for resistance to the disease:
Bacteria used to produce human insulin chains is:
Identify the wrong statement from the following:
If energy of an electron in the first orbit is -13.6 eV, then predict the amount of energy required to transfer it to the fourth orbit.
Metal oxides of A(m) and B(m) are structurally similar. Atomic weight of A is 52 and vapor density of its chloride is 79. Oxide of B contains 47.1% oxygen. Considering the above data, calculate the atomic weight of B (in nearest whole number).

Explain the following nitration reaction:

SiF$_6^{2-}$ exists but CF$_6^{2-}$ does not. Offer reason.
Cite the name of the enzyme responsible for the following biochemical transformation: \[ C_6H_{12}O_6 (\text{Glucose}) \xrightarrow{\text{Enzyme}} 2C_2H_5OH + 2CO_2 (\text{Ethanol}) \]
In the wave equation $ y = 3 \cos \pi (100t - x) \, \text{cm}$, the wavelength is
Young’s modulus of steel is $ 2 \times 10^{11} \, \text{N/m}^2 $ and strain at elastic limit is 0.15. The value of limiting stress will be
The distance covered by a particle moving in a straight line path at time $ t $ (in seconds) is given by $ s = (t^3 - 6t^2 + 3t + 4) \, \text{m}$. The velocity of the particle when its acceleration is zero, will be
The number of recombinants in the 1280 progeny obtained through a dihybrid cross of Mendel in the F2 generation.

The corresponding logic gate for the given truth table is

Arrange the following in correct order in polymerase chain reaction cycle: 
I Deannealing
II Denaturation
III Extension
IV Annealing 
 

The value of current $ I $ in the adjoining circuit will be

If the probability density function of a random variable is given by $$ f(x) = \begin{cases} 12x^2(1 - x), & 0 \leq x \leq 1 \\ 0, & \text{elsewhere} \end{cases} $$ then the mean and variance are respectively:

The area of a parallelogram whose diagonals are given by $ \vec{u} + \vec{v} $ and $ \vec{v} + \vec{w} $, where: 
$ \vec{u} = 2\hat{i} - 3\hat{j} + \hat{k}, \quad \vec{v} = -\hat{i} + \hat{k}, \quad \vec{w} = 2\hat{j} - \hat{k} $ is:

Assertion (A): Primers are used in polymerase chain reaction technique. Reason (R): Primers is used for the addition of new DNA nucleotides.

The direction ratios of the normal to the plane passing through the points 
$ (1, 2, -3), \quad (1, -2, 1) \quad \text{and parallel to the line} \quad \frac{x - 2}{2} = \frac{y + 1}{3} = \frac{z}{4} \text{ is:} $

Identify A and B in the diagram given below: 


 

The angle between the lines joining the foci of an ellipse to one particular extremity of the minor axis is $ 90^\circ $. The eccentricity of the ellipse is:
If $ 0<\theta<\pi $ and $ \cos \theta + \sin \theta = \frac{1}{2} $, then the value of $ \tan \theta $ is:
In a triangle $ ABC $, if angles $ A $, $ B $, and $ C $ are in A.P., then $ \frac{a + c}{b} $ is equal to: