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JEE 2020 : Weekly Quiz 32 (29.09.2019)

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Question 1

An electron accelerated under a potential difference V volt has a certain wavelength λ. Mass of proton is some 2000 times of the mass of the electron. If the proton has to have the same wavelength λ, then it will have to be accelerated under a potential difference of

Question 2

The frequency of incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is

Question 3

When a certain metallic surface is illuminated and monochromatic light of wavelength ‘λ, the stopping potential for photoelectric currebbt 3V0. When the same surface is illuminated with a light of wave length 2λ, the stopping potential is V0. The threshold wavelength for the surface to photoelectric effect is

Question 4

The surface of the metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV, the work function of metal is

Question 5

Description: E:\KCET-1-Feb\Karnataka_CET2013_files\image118.png1 and Description: E:\KCET-1-Feb\Karnataka_CET2013_files\image118.png2 are used to illuminate the slits. Description: E:\KCET-1-Feb\Karnataka_CET2013_files\image131.png1 and Description: E:\KCET-1-Feb\Karnataka_CET2013_files\image131.png2 are the corresponding fringe widths. The wavelength Description: E:\KCET-1-Feb\Karnataka_CET2013_files\image118.png1 can produce photoelectric effect when incident on a metal. But the wavelength Description: E:\KCET-1-Feb\Karnataka_CET2013_files\image118.png2 cannot produce photoelectric effect. The correct relation between Description: E:\KCET-1-Feb\Karnataka_CET2013_files\image131.png1 and Description: E:\KCET-1-Feb\Karnataka_CET2013_files\image131.png2 is

Question 6

A direct X-ray photograph of the intenstines is not generally taken by radiologists because

Question 7

The wavelength of the wave associated with a moving electon depends on

Question 8

A laser device produces amplification in the_____.

Question 9

The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be

Question 10

Which of the following rays is emitted by a human body?

Question 11

Both, autogamy and geitonogamy are prevented in

Question 12

Three metals A, B and C when illuminated with appropriate radiations, they emit photoelectrons. the order of work functions of A, B and C is A > B > C. Which of the following is the correct order of threshold frequency?

Question 13

The wavelength of a photon is 7 x10-7 m. Calculate the energy of the photon in Joules.

Question 14

Which of the following statements is correct?

Question 15

Wavelength is measured by Angstrom (Å)unit. 1 Å is equivalent to

Question 16

The simplest formula of a compound containing 50% of element X (atomic mass 10) and 50% of element Y (atomic mass 20) is

Question 17

12g of Mg (at. mass 24) will react completely with acid to give

Question 18

If moles of oxygen combine with Al to form the weight of Al used in the reaction is (Al=27)

Question 19

Which of the following statement is incorrect?

Question 20

The terms rate of reaction and rate of appearance (or disappearance) of reactant (or product)

Question 21

The number of triangles whose vertices are at the vertices of an octagon but none of sides happen to come from the sides of the octagon is-

Question 22

The number of proper divisors of 2p. 6q. 15r is-

Question 23

Each scratch card contains code either A1 or A2 or A3. If m cards are scratched then the number of ways we will never get 3 different code is

Question 24

The value of nCr-3 + 3nCr-2 + 3nCr-1 + nCr is equal to

Question 25

If letters of the word ‘KUBER’ are written in all possible orders and arranged as in a dictionary, then rank of the word ‘KUBER’ will be:

Question 26

Five balls of different colors are to be placed in three boxes of different sizes. Each box can hold all five balls. The number of ways in which we can place the balls in the boxes (order is not considered in the box) so that no box remains empty is

Question 27

There are 20 people among whom two are brothers. The number of ways in which we can arrange them around a circle so that there is exactly one person between those brothers is

Question 28

For a Probability to be Mutually exhaustive which of the following is a necessary condition

Question 29

If the letters of INTERMEDIATE are arranged, then the probability no two E's occur together is

Question 30

The letters of the word 'FORTUNATES' are arranged at random in a row. What is the chance that the two ' T ' come together.
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Dec 13JEE & BITSAT