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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
1 and 2 are used to illuminate the slits. 1 and 2 are the corresponding fringe widths. The wavelength 1 can produce photoelectric effect when incident on a metal. But the wavelength 2 cannot produce photoelectric effect. The correct relation between 1 and 2 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