JEE Main Class XI Weekly Mock 13 for JEE & BITSAT Exams

Question 1

Commercial hydrogen is obtained from -

Question 2

Which is true statement about D₂O and H₂O -

Question 3

Abudance of H₂ in the earth's atmosphere is very small. This is because -

Question 4

When 50% solution of H₂SO₄ is electrolysed by passing a current of high density at low temperature the main products of electrolysis are -

Question 5

Out of the following metals which will give H₂ on reaction with NaOH -
I : Zn, II : Mg, III : Al, IV : Be

Question 6

The number of lines passing through (2, 3) each having distance equal to 5 units from the point (7, 8) is:

Question 7

Let P = (1, 1) and Q = (3, 2). The point R on the x-axis such that PR + RQ is the minimum is

Question 8

If in an examination different weights are assigned to different subjects Physics (2), Chemistry (1), English (1), Maths (2) a student scores 60 in Physics, 70 in Chemistry, 70 in English and 80 in Maths, then weighted A.M. is

Question 9

Which of following statements are INCORRECT-

Question 10

Which of the following statements are INCORRECT-

Question 11

W is the work done in forming a bubble of radius r, the work done in forming a bubble of radius 2r will be -

Question 12

There is a horizontal film of soap solution. On it a thread is placed in the form of a loop. The film is pierced inside the loop and the thread becomes a circular loop of radius R. If the surface tension of the loop be T, then what will be the tension in the thread–

Question 13

The adjoining diagram shows three soap bubbles A, B and C prepared by blowing the capillary tube fitted with stop cocks, S₁, S₂ and S₃. With stop cock S closed and stop cocks S₁, S₂ and S₃ opened–

Question 14

A liquid is contained in a vertical tube of semicircular cross-section (shown in figure). The contact angle is zero. The force of surface tension on the curved part and on the flat part are in ratio–

Question 15

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–