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KIITEE Mock Test - 9 - JEE MCQ

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30 Questions MCQ Test - KIITEE Mock Test - 9

KIITEE Mock Test - 9 for JEE 2025 is part of JEE preparation. The KIITEE Mock Test - 9 questions and answers have been prepared according to the JEE exam syllabus.The KIITEE Mock Test - 9 MCQs are made for JEE 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for KIITEE Mock Test - 9 below.

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KIITEE Mock Test - 9 - Question 1

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What is the particle x in the following nuclear reaction?

A.
Electron
B.
Proton
C.
Photon
D.
Neutron

KIITEE Mock Test - 9 - Question 2

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The minimum energy required to remove an electron is called

A.
Stopping potential
B.
Kinetic energy
C.
Work function
D.
None of these

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KIITEE Mock Test - 9 - Question 3

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Sodium surface is subjected to ultraviolet and infrared radiations separately and the stopping potential of photoelectrons determined. Then the stopping potential is

A.
Equal in both cases
B.
More when ultraviolet is used
C.
More when infrared is used
D.
May be more or less for ultraviolet depending upon its intensity as compared to the intensity of infrared light

KIITEE Mock Test - 9 - Question 4

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The decay constant of a radio active substance is λ . Its half life is

A.
log²10/λ
B.
λ/log²10
C.
1/λ
D.
log e²/λ

KIITEE Mock Test - 9 - Question 5

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The photoelectric work function for a metal surface is 4.125 eV. The cut off wavelength for this surface is

A.
4125 Å
B.
2062.5 Å
C.
3000 Å
D.
6000 Å

Detailed Solution for KIITEE Mock Test - 9 - Question 5

Work function W₀ = hc/λ
∴ λ = hc/W_o = 12400/4.125 = 3000 Å

KIITEE Mock Test - 9 - Question 6

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The work function of oxide coated tungsten emitter will be

A.
1.1 eV
B.
2.62 eV
C.
4.72 eV
D.
4.5 eV

KIITEE Mock Test - 9 - Question 7

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Stopping potential for photoelectrons

A.
Does not depend on the frequency of the incident light
B.
Does not depend upon the nature of the cathode material
C.
Depends on both the frequency of the incident light and the nature of cathode material
D.
Depends upon the intensity of the incident light

KIITEE Mock Test - 9 - Question 8

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The photoelectric threshold of a certain metal is 30 Å. If the radiation of 2000 Å is incident on the metal

A.
Positrons will be emitted
B.
Protons will be emitted
C.
Electrons will be emitted
D.
Electrons will not be emitted

KIITEE Mock Test - 9 - Question 9

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

A.
S
B.
SO₃
C.
H₂
D.
O₂

KIITEE Mock Test - 9 - Question 10

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The cell potential of the following cell at 25 ⁰C (in volts) is
Pt , H₂ (1 atm) | H⁺ 0.01 M ∥ Cu²⁺ (0.1 M) | Cu (E^o Cu²⁺ ∕ Cu = + 0.337 V)

A.
0.308
B.
0.427
C.
-0.308
D.
0.337

KIITEE Mock Test - 9 - Question 11

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Structural formula of ethanenitrile is

A.
C₂H₅C ≡ N
B.
CH₃C ≡ N
C.
C₂H₅NO₂
D.
CH₃NO₂

KIITEE Mock Test - 9 - Question 12

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In the presence of acid, the hydrolysis of methyl cyanide gives

A.
Methanoic acid
B.
Ethanoic acid
C.
Methylamine
D.
Methyl alcohol

KIITEE Mock Test - 9 - Question 13

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The correct structure of Fe(CO)₅ is (Z = 26 for Fe)

A.
Octahedral
B.
Tetrahedral
C.
Square pyramidal
D.
Trigonal pyramidal

KIITEE Mock Test - 9 - Question 14

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Which one of the following is not the correct reaction of aryl diazonium salts?

KIITEE Mock Test - 9 - Question 15

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In the diazotisation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily to

A.
Supress the hydrolysis to phenol
B.
Supress the concentration of free aniline
C.
Ensure a stochiometric amount of nitrous acid
D.
Neutralise the base liberated

Detailed Solution for KIITEE Mock Test - 9 - Question 15

Suppress the concentration of free aniline available for coupling
Excess of HCl is used to convert free aniline to aniline hydrochloride. Other wise free aniline would undergo coupling reaction with benzene diazonium chloride

KIITEE Mock Test - 9 - Question 16

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Which of the following shows maximum no. of oxidation states?

A.
N
B.
Fe
C.
Mn
D.
Cr

KIITEE Mock Test - 9 - Question 17

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In the diazotisation of aniline with sodium nitrite and hydrochloric acid, the excess of hydrochloric acid is used primarily to

A.
Supress the concentration of free aniline
B.
Supress the hydrolysis to phenol
C.
Ensure a stochiometric amount of nitrous acid
D.
Neutralise the base liberated

KIITEE Mock Test - 9 - Question 18

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An electrolyte

A.
form complex ions in solution
B.
gives ions only when electricity is passed
C.
possesses ions even in solid state
D.
gives ions only when dissolved in water

KIITEE Mock Test - 9 - Question 19

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

A.
40
B.
45
C.
40 + 21/25
D.
none of these

Detailed Solution for KIITEE Mock Test - 9 - Question 19

If each item of a data is increased (or decreased) by the same quantity, the standard deviation (and the variance) is not changed.

KIITEE Mock Test - 9 - Question 20

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The coefficient of correlation r satisfies

A.
0 < r < 1
B.
| r | > 1
C.
| r | ≤ 1
D.
-1 < r < 0

KIITEE Mock Test - 9 - Question 21

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If the roots of the equation (2k+1)x² - (7k-3)x+k+2=0 are reciprocal of each other, the value of k is

A.
0
B.
1
C.
2
D.
3

KIITEE Mock Test - 9 - Question 22

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The number of terms of the A.P. 3, 7, 11, 15,...to be taken so that the sum is 406 is

A.
5
B.
10
C.
12
D.
14

KIITEE Mock Test - 9 - Question 23

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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

A.
4 and 8
B.
4 and 9
C.
5 and 7
D.
5 and 9

KIITEE Mock Test - 9 - Question 24

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11² + 12²+ 13² +....+20²is equal to

A.
2481
B.
2487
C.
2485
D.
2483

KIITEE Mock Test - 9 - Question 25

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Which of the following measures of marks is the most suitable one of central location for computing intelligence of students?

A.
Mode
B.
Arithmetic mean
C.
Geometric Mean
D.
Median

KIITEE Mock Test - 9 - Question 26

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The average of values 0, 2, 4, 6, 8, ...., 2n is

A.
n
B.
n + 1
C.
2n
D.
2(n + 1)

Detailed Solution for KIITEE Mock Test - 9 - Question 26

KIITEE Mock Test - 9 - Question 27

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The harmonic mean of 4,8,16 is

A.
6.4
B.
6.7
C.
6.85
D.
7.8

KIITEE Mock Test - 9 - Question 28

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If the A.M. and G.M, of the roots of a quadratic equation in x are p and q respectively, then its equation is

A.
x² - 2px + q² = 0
B.
x² + 2px + q² = 0
C.
x² - px + q² = 0
D.
x² - 2px + q = 0

KIITEE Mock Test - 9 - Question 29

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If x is a positive real number different from 1, then the number 1/1 + √x, 1/1 - x , 1/1 - √x, .... are in

A.
A.P.
B.
G.P.
C.
H.P.
D.
no definite sequence

KIITEE Mock Test - 9 - Question 30

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p and q are the roots of x² + ax + b = 0, then equation whose roots are p²q, q²p is

A.
x² + abx + b³ = 0
B.
x² - abx + b³ = 0
C.
bx² + x + a = 20
D.
x² + ax + ab = 0

Detailed Solution for KIITEE Mock Test - 9 - Question 30

p + q = - a, p.q = b
Now, p² q + q² p = pq(p + q)
= b(-a) = - ab
p²q . q²p = (pq)³ = b³
The required equation is
x² - (p²q + q²p) x+ (p²q . q²p) = 0
x² + abx + b³ = 0

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