JEE 2020: Weekly Quiz 14 (28.07.2019) for JEE & BITSAT Exams

Question 1

Question 2

Question 3

Question 4

is a polynomial of degree

Question 5

If

, then

Question 6

is equal to

Question 7

The value of

is

Question 8

is equal to

Question 9

is equal to

Question 10

If

, then

Question 11

Which transition involves maximum amount of energy

Question 12

IE(I) and IE(II) of Mg are 178 and 348 kcalmol^-1. The energy required for the reaction Mg → Mg²⁺ + 2e^– is :

Question 13

The electron affinity of a hypothetical element ‘A’ is 3 eV per atom. How much energy in kcal is released when 10g of ‘A’ is completely converted to A^¯ ion in a gaseous state?

(1 eV per atom = 23 kcal mol^–1, Molar mass of A = 30 g)

Question 14

The ionization potential of X^– ion is numerically equal to :

Question 15

Which of the following order is wrong?

Question 16

Which of the following reasons explains the fact that the electron affinity of fluorine is less than chlorine?

Question 17

For a molecule Br₂, total distance between two nuclei is 3.2 Å. What will be the co-valent radius of Br atom?

Question 18

The hypothetical complex chlorodiaquatriammine cobalt(III) chloride can be represented as:

Question 19

Which one of the following will give maximum number of isomers?

Question 20

Which of the following statements are true according to postulates of Werner’s theory?

Question 21

One end of a rod of length

L=1 m is fixed to a point on the circumference of a wheel of radius

m. The other end is sliding freely along a straight channel passing through the center O of the wheel as shown in the figure below. The wheel is rotating with a constant angular velocity ω about O.

The speed of the sliding end P when

is

Question 22

In vertical circular motion, the ratio of kinetic energy of a particle at highest point to that at lowest point is

Question 23

A plank is resting on a horizontal ground in the northern hemisphere of the Earth at a 45

latitude. Let the angular speed of the Earth be

and its radius

. The magnitude of the frictional force on the plank will be

Question 24

A force

is applied on a block of mass 5kg along the fixed smooth incline as shown in figure. Here gravitational acceleration

. The acceleration of the block is

Question 25

A block A of mass 4 kg is placed on another block B of mass 5 kg, and the block B rests on a smooth horizontal table. If the maximum force that can be applied on A so that both the blocks move together is 12 N, the maximum force that can be applied on B for the blocks to move together will be:

Question 26

A ball of mass

suspended from a rigid support by an inextendible massless string is released from a height

above its lowest point. At its lowest point it collides elasctically with a block of mass 2

at rest on a frictionless surface. Neglect the dimensions of the ball and the block. After the collision the ball rises to a maximum height of

Question 27

The X and Y components of a force F acting at 30 º to x-axis are respectively

Question 28

Two bodies of masses m₁ and m₂ are acted upon by a constant force F for a time t. They start from rest and acquire kinetic energies E₁ and E₂ respectively. Then $Description: E:\KCET-1-Feb\KARNATAKA-PAPER-2012_files\image132.png$ is

Question 29

A truck accelerates from spped v to 2v. Work done in during this is

Question 30

If the potential energy of a gas molecule is

being positive constants, then the potential energy at equilibrium must be