JEE Main Preparation Online Mock Test

1. The molecular mass of each N₂ and CO is 28. If 0.5 L of N₂ at 27°C and 700 mm pressure contains n molecules, the number of molecules in 1.0 L of CO under identical conditions will be?

2. Find the maximum potential difference which may be applied across and X-ray tube with tungsten target without emitting any characteristic K or L X-ray. The energy levels of tungsten atoms are as follows

(K shell—69.5 keV, L shell –11.3 keV, M shell—2.3 keV)

3. A particle is moving along a straight line whose position as a function of time is given by x(t) = (3t² - 6t³ + 6)m. Find the time at which velocity would be maximum, also find this maximum velocity and position of particle at this moment.

4. The equation 16x² - 3y² - 32x+12y - 44=0 represents a hyperbola

5. Statement I: KCl/NaCl/NH₄Cl etc cannot be used in the salt bridge of a cell containing silver.

Statement II : A salt bridge contains concentrated solution of an inert electrolyte like KCl, KNO₃, K₂SO₄ etc or solidified solution of such an electrolyte in agar-agar and gelatine.

6. Statement I: Pyrolyze undergoes electroscopic substitution much further than pyridine.

Statement II : Nitrogen in pyrolyze activates the ring and nitrogen in pyridine deactivates the ring.

Question has two statements Statement I (Assertion), Statement II (Reason). Question has four alternative choices. Choose only one correct choices.

7. If x > 1, y > 1, z > 1 are in GP, then 1/1+In x, 1/1+In y, 1/1+In z are in

8. Current through R₁ is independent of

9. ƒ(x) = sin [x]/[x],            [x]≠0

0,                      [x]≠0

where [x] denotes the greatest integer less than or equal to x, then lim_x→0  ƒ(x) equals

10. Statement I : The value of enthalpy of neutralization of a week acid by strong base is numerically less than 57.1 kJ.

Statement II: All OH^- ions of strong base are not completely neutralized by H⁺ ions obtained from acid.

Question has two statements Statement I (Assertion), Statement II (Reason). Question has four alternative choices. Choose only one correct choices.

11. The normal to the curve y= ƒ(x) at the point (3, 4) makes an angle 3 π/4 with the positive x-axis, then ƒ′ (3) is equal to

12. If p : It rains today q : I go to school, r : I shall meet any friends and s : I shall go for a movie, then which of the following is the proportion. If it does not rain or if I do not go to school, then I shall meet my friends and go for a movie.

13. When a metal is to be extracted from its ore and if the gangue associated with the ore is silica, then

14. In the contact process, the impurities of arsenic are removed by

15. Which of the following doesn't cause origin of charge on colloid?