List of practice Questions

For an autocatalytic second-order reaction R $\rightarrow$ P, the rate law is
[where v is the rate of the reaction and k is the rate constant]
Which of the following is NOT an example of an adaptive defense mechanism against predation?
Match the entries in Group I with those in Group II
Group I
P) Nucleolus
Q) Sphaerosomes
R) Peroxisomes
S) Plasmodesmata
Group II
1) lipid storage
2) breakdown of fatty acids
3) transport of macromolecules
4) RNA synthesis
The nitrogenase of diazotrophs
During eukaryotic cell division, the amount of DNA doubles
Which of the following is true of protein synthesis ONLY in prokaryotes?
Match the entries in Group I with those in Group II
Group I
P) Phytase
Q) Xylanase
R) Laccase
S) Bromelain
Group II
1) paper and pulp processing
2) delignification
3) gluten complex reduction
4) improve mineral availability
5) phosphorylation
If an aldol cleavage of glucose-6-phosphate occurs in glycolysis, it will result in
The natural geographical distribution of kangaroos is limited to the Australian continent because
The refractive index of diamond is 2.419. If the speed of light in vacuum is $3 \times 10^8$ m s$^{-1}$, then the speed of light in diamond is
The role of enzyme E synthesized by phage $\phi$X174 during host infection is to
Among CH$_4$, H$_2$O, NH$_3$ and PH$_3$, the molecule having the smallest percent s character for the covalent bond (X–H) is
cos(x + yx) =
Which of the following is NOT involved in eukaryotic translation?
Which of the following statements is correct?
The antigen binding site of an antibody is present
If the escape speed of a projectile on Earth's surface is \( 11.2 \, \text{km/s} \) and a body is projected out with thrice this speed, then determine the speed of the body far away from the Earth.
Consider the analogy between an oscillating spring-body system and an oscillating L-C-R circuit. Then, the correspondence between the two systems that is NOT correct is:
A tank is filled with a liquid upto a height \( H \). A small hole is made at the bottom of this tank. Consider \( t_1 \) be the time taken to empty the first half of the tank and \( t_2 \) be the time taken to empty the rest half of the tank. Then, determine the ratio \( \frac{t_1}{t_2} \).
In a cinema, a picture 2.5 cm wide on the film is projected to an image 3.0 m wide on a screen that is 18 m away. The focal length of the lens is about:
The coefficient of volume expansion of glycerine is \( 49 \times 10^{-5} \, \text{K}^{-1} \). What is the fractional change in its density for a \( 30^\circ \text{C} \) rise in temperature?

Use the diagram below to answer the following questions. 40 spheres of equal mass make two rings of 20 spheres each. The ring on the right has a radius twice as large as the ring on the left. At what position could a mass be placed so that the gravitational force it would experience would be the same from both rings?

Two litres of water kept in a container at \( 27^\circ \text{C} \) is heated with a coil of 1 kW. The lid of the container is open and energy dissipates at the rate of 160 J/s. If the specific heat of water is 4.2 kJ/kg, then the time taken by coil to raise the temperature of water from \( 27^\circ \text{C} \) to \( 77^\circ \text{C} \) is:
A ring of radius \( R \) is first rotated with an angular velocity \( \omega \), and then carefully placed on a rough horizontal surface. The coefficient of friction between the surface and the ring is \( \mu \). Time after which its angular speed is reduced to half is:

A ball of mass \( m \) moving at a speed \( v \) makes a head-on collision with an identical ball at rest. The kinetic energy at the balls after the collision is \( \frac{3}{4} \) of the original. What is the coefficient of restitution?