KIITEE Mock Test - 9 - JEE MCQ

The work function of a metal is 2.8 eV. Its threshold wavelength will be

Einstein's work on the photoelectric effect provied support for the equation

If M(A;Z), M p and M n denote the masses of the nucleus Z A X , proton and neutron respectively in units of u (1u=931.5 MeV/C²) and BE represents its bonding energy in MeV, then

A nucleus with Z = 92 emits the following in sequence: α , α , β − , β − , α , α , α , α ; β − , β − , α , β + , β + , α . The Z of the resulting nucleus is

In a Huygen's eye piece with an eyepiece of focal length F, the distance between the eye-piece and field lens should be

When the light source is kept 20 cm away from a photocell, stopping potential is 0.6 V is obtained. When the source is kept 40 cm away, the stopping potential will be

The source of stellar energy is

Mass - energy equation was proposed by

When dilute H₂SO₄ is electrolysed at room temperature between Pt electrodes. The substance liberated at anode is

The equivalent conductivity of 0.1 M weak acid is 100 times less than that at infinite dilution.The degree of dissociation is

At STP,1.12 litre of H₂ is obtained on flowing a current for 965 seconds in a solution.The value of current is

Which of the following reagent can be used to convert benzene diazonium chloride into benzene ?

Corrosion can be prevented by

Which of the following is produced by reaction of RCN in sodium and alcohol ?

If hydrogen electrode dipped into solution of pH = 3 and pH = 6 and salt bridge is connected the e.m.f. of resulting cell is

In a galvanic cell, the electrons flow from

The mean deviation of the numbers 3, 4, 5, 6, 7 is

If v is the variance and σ is the standard deviation, then

Two numbers within the brackets denote the ranks of 10 students of a class in two subjects - (1, 10), (2, 9), (3, 8), (4, 7), (5, 6), (6, 5), (7, 4), (8, 3), (9, 2), (10, 1), then rank correlation coefficient is

The standard deviation of 25 numbers is 40. If each of the numbers is increased by 5, then the new standard deviation will be

In the expansion of (1 + x)ⁿ,coefficients of 2nd ,3rd and 4th terms are in A.P.Then n is equal to

A batsman scores runs in 10 innings 38, 70, 48, 34, 42, 55, 63, 46, 54 and 44, then the mean deviation is

The mean deviation of the numbers 3, 4, 5, 6, 7 is

The mode of the following items is 0,1,6,7,2,3,7,6,6,2,6,0,5,6,0, is

The mean of 5 observations is 4.4 and their variance is 8.24. If three observations are 1, 2 and 6, the other two observations are