List of practice Questions

The decimal reduction time (DRT or D value) of a bacterial culture is one minute. If a suspension of the bacterial culture contains an initial population of \( 10^6 \) cells, then the time (in minutes) required to reduce the number of bacteria to 10 by heat treatment is ............

A variable number of tandem repeats (VNTR) locus has 15 different alleles. The number of genotypes possible in a population for this VNTR is ............

The solution to the limit \( \lim_{x \to 0} \frac{2 - \sqrt{4 - x}}{x} \) is ...........

Consider two particles, each of mass 20 g; the first particle is moving with a speed of 10 m/s along a one-dimensional track in the positive x-direction and collides with the second particle at rest. Assuming that the collision is elastic, the speed (in m/s) of the first particle after the collision is ...............

The volume (in mL) required to prepare 350 mL of 1X buffer solution from a fifty times (50X) concentrated buffer stock solution is ..........

A compound microscope has its objective with linear magnification of 10. In order to achieve a final magnification of 100, the angular magnification of the eyepiece should be ..........

The generation time of E. coli is 20 minutes. If there are \( 10^6 \) E. coli present in an exponentially growing synchronous culture, then the average time (in minutes) required to obtain a final population of \( 4 \times 10^6 \) E. coli is ................

In a typical mammalian cell, the protein content is 20 % of its net weight. If the density and volume of the cell are 1.2 g/mL and 4 × 10\(^{-9}\) mL, respectively, then the concentration (in mg/mL) of the protein is

Consider a spherical particle of mass \( m \) and radius \( r \) moving in a medium. Its velocity at any time is given by \( v = v_0 \exp\left( -\frac{6 \pi X r t}{m} \right) \), where \( v_0 \) is the initial velocity of the particle. The dimensions of \( X \) are

The common component in crustacean exoskeleton and fungal cell wall is

During El Niño,

Eutrophication refers to an aging process from a

T cells and B cells are

In humans, the testis temperature is maintained below the core body temperature with the help of

Protein that helps other proteins to fold correctly is

The CORRECT sequence of phases during mitosis is

In viruses, capsids are made up of

A train travels the first 160 km at 64 km/hr and the next 160 km at 80 km/hr. What is the average speed of the train?

Find out the missing number in the following number series.
483, 500, 581, 711, 877, ?

What will be the missing term in the series: 11, 88, ..., 6336, 57024, 456192?

The area of triangle is half the area of a square. The perimeter of the square is 224cms. What is the area of the triangle?

If \(\frac {(2 sin\ θ – cos\ θ)}{(cos\ θ + sin\ θ)} = 1\), then the value of \(cot\ θ \) is

What is the value of \( \sin 45^\circ + \tan 45^\circ \)?

What is the value of \( \frac{\sin 42^\circ}{\cos 48^\circ} \)?