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# JEE Main Class XI Weekly Mock 2

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Question 1

On analysis, a certain compound was found to have 254g of iodine(at. Mass 127) and 80g oxygen(at. Mass 16). What is the molecular formula of the compound?

Question 2

The vapour density of gas A is four times that of B. If molecular mass of B is M, then molecular mass of A is:

Question 3

The number of Ca

^{2+}and Cl ¯ ions present in anhydrous CaCl_{2}is 3.01 × 10^{23}and 6.023 × 10^{23}respectively. The weight of the anhydrous sample is -Question 4

Which of the following contains largest number of atoms -

Question 5

1 gram of a carbonate on treatment with excess HCl produces 0.01186 mole of CO

_{2}. The molar mass of in g mol^{-1}is:Question 6

Let X = {1, 2, 3, 4, 5}. The number of different ordered pairs (Y, Z) that can be formed such that X and Y ∩ Z is empty, is

Question 7

If X = {4

^{n}– 3n – 1 : n ∈ N} and Y = {9(n – 1) : n ∈ N}, where N is the set of natural numbers, then X ∪ Y is equal toQuestion 8

Let R = {(3, 3), (6, 6), (9, 9), (12, 12), (6, 12), (3, 9), (3, 12), (3, 6)} be a relation on the set A = {3, 6, 9, 12}. The relation is

Question 9

How many real solutions does the equation x

^{7}+ 14x^{5}+ 16x^{3}+ 30x – 560 = 0 have?Question 10

Let A={x

_{1},x_{2},...,x_{7}} and B={y_{1},y_{2},y_{3}} two sets containing seven and three distinct elements respectively. Then the total number of functions f→A:B that are onto, if there exists exactly three elements in A such that, f(x)=y_{2}is equal toQuestion 11

A body of mass m = 3.513 kg is moving along the x axis with a speed of 5.00 ms

^{-1}. The magnitude of its momentum is recorded asQuestion 12

An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment distances are measured by

Question 13

A beaker contains a fluid of density , specific heat and viscosity . The beaker is filled up to height h. To estimate the rate of heat transfer per unit area by convection when beaker is put on a hot plate, a student proposes that it should depend on , and when (in °C) is the difference in the temperature between the bottom and top of the fluid. In that situation the correct option for is:

Question 14

From the following combinations of physical constants (expressed through their usual symbols) the only combination, that would have the same value in different systems of units, is:

Question 15

Dimensions of , where symbols have their usual meaning, are

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Saruchi KaushikMember since Feb 2018

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