JEE 2020: Weekly Quiz 19 (17.08.2019) for JEE & BITSAT Exams

Question 1

The number of structural isomers for

is:

Question 2

In the following benzyl and allyl system

decreasing order of inductive effect is:

Question 3

Which of the following compound is not chiral?

Question 4

Which one the following does not have sp² hybridized carbon?

Question 5

(I) (II)
H – N - - - N - - - N
In hydrogen azide (above) the bond orders of bonds (I) and (II) are :

Question 6

The structure of the major product formed in the following reaction

is

Question 7

Biuret test is not given by

Question 8

The main product of the following reaction is

Question 9

The species which can best serve as an initiator for the cationic polymerization is :

Question 10

Which one of the following bases is not present in DNA?

Question 11

A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is just immersed in the water, the force on the bottom of the vessel in contact with the cube

Question 12

A solid cone of height 25 cm and base diameter 25 cm floats in water with its vertex downwards such that 20 cm of its axis is immersed. The additional weight that must be placed at the centre of the base such that the cone now is completely immersed in water is-

Question 13

A cylindrical wooden body of height 3 m and mass 80 kg floats vertically in water. If its specific gravity is 0.80, the amount by which it gets depressed when a body of mass 10 kg is placed on its upper surface is -

Question 14

The hydraulic press is used to raise the mass M through a height of 0.5 cm be performing 500 J of work at the small piston . The diameter of the large piston is 10 cm , while that of the smaller one is 1 cm . The mss M is :

Question 15

An object of mass 26kg floats in air and it is in equilibrium state. Air density is 1.3 kg/m³. The volume of the object is:

Question 16

In the given figure, atmospheric pressure P₀ = 1 atm and mercury column length is 9cm. Pressure P of the gas enclosed in the tube is:

Question 17

A sphere of radius R and density ρ₁ is dropped in a liquid of density σ. Its terminal velocity is v₁. If another sphere of radius R and density ρ₂ is dropped in the same liquid, its terminal velocity will be

Question 18

If the terminal speed of a phere of gold (density = 19.5 kg/m³) is 0.2 m/s in a viscous liquid (density = 1.5 kg/m³), find the terminal speed of a sphere of silver (density = 10.5 kg/m³) of the same size in the same liquid

Question 19

Which of the following option correctly describes the variation of the speed v and acceleration ‘a’ of a point mass falling vertically in a viscous medium that applies a force F =−kv, where ‘k’ is a constant, on the body? (Graphs are schematic and not drawn to scale)

Question 20

A small sphere of mass m is dropped from a great height. After it has fallen 100 m, it has attached its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first 100 m of fall is–