JEE 2020: Weekly Quiz 20 (18.08.2019) for JEE & BITSAT Exams

Question 1

Given,

Which of the given compounds can exhibit tautomerism?

Question 2

How many stereoisomers does this molecule have?

Question 3

The correct order of increasing reactivity of C-X bond towards nucleophile in the following compounds is

Question 4

In which of the following molecules, all atoms are coplanar?

Question 5

Two possible stereo-structures of CH₃CHOH.COOH, which are optically active, are called

Question 6

In the Kjedahl’s method for estimation of nitrogen present in soil sample, ammonia evolved from 0.75g of sample neutralized 10ml. of 1M H₂SO₄ The percentage of nitrogen in the soil is:

Question 7

The most suitable method of separation of 1:1 mixture of ortho and para-nitrophenols is:

Question 8

The Lassaigne’s extract is boiled with conc HNO₃ while testing for halogens. By doing so it

Question 9

The difference between amylose and amylopectin is

Question 10

Regarding cross-linked or network polymers, which of the following statements is incorrect?

Question 11

In a school’s garden a boy sees that the circular pipes of cross-section with diameters

and

water flows through it. Then what is the ratio of velocities in the two pipes he found

Question 12

In Physics Lab experiment teacher explain laws of fluid and he put a capillary in dipped water vertically, the height of water column in the capillary is

. When the capillary is bent according to the figure, the height of water column will become

Question 13

A student performs an experiment on elasticity so he takes a wire of length 50 m that equals to height of his school building and the cross-section area of wire 25 m² and Young modulus

behaves as a spring of spring constant k, then

Question 14

A load of

is supported from a pulley which in turn is supported by a rope of cross sectional area

and Young’s modulus

. Neglecting the friction at pulley determine deflection of the load.

Question 15

A metal wire of length

is suspended vertically from a rigid support. When a body of mass

is attached to the lower end of wire, the elongation of the wire is

.

Question 16

1000 dropets of water having 2mm diameter each coalesce to form a sing drop. Given the surface tension of water is 0.072 N ^m-1. The energy loss in the process is

Question 17

Two capillary tubes of different diameters are dipped in water. The rise of water is

Question 18

The following observations were taken for determining surface tension T of water by capillary method:
diameter of capillary, D=1.25×10^-2 m rise of water, h=1.45×10^-2 m.
Using g=9.80 m/s² and the simplified relation

the possible error in surface tension is closest to:

Question 19

The rate of flow of liquid through a capillary tube in an experiment to determine the viscosity of liquid, increases -

Question 20

A ball is made of a material of density ρ where ρ_oil < ρ < ρ_water with ρ_oil and ρ_water representing the densities of oil and water, respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, which of the following pictures represents its equilibrium position ?

Question 21

In the given figure what is the relation between Q and P

Question 22

Two lines are such that they are at an angle S to each other. The equations of the lines are given as follows. The distance between the points (2,3,4) and (4,6,10) is D. find Dcos S
L1: