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KIITEE Mock Test - 4 - JEE MCQ

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30 Questions MCQ Test - KIITEE Mock Test - 4

KIITEE Mock Test - 4 for JEE 2025 is part of JEE preparation. The KIITEE Mock Test - 4 questions and answers have been prepared according to the JEE exam syllabus.The KIITEE Mock Test - 4 MCQs are made for JEE 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for KIITEE Mock Test - 4 below.

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KIITEE Mock Test - 4 - Question 1

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If a full wave rectifier circuit is operating from 50 Hz mains, then fundamental frequency in the ripple will be

A.
50 Hz
B.
70.7 Hz
C.
100 Hz
D.
25 Hz

KIITEE Mock Test - 4 - Question 2

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In a common-base amplifier, the phase difference between the input signal voltage and output voltage is

A.
0
B.
π/4
C.
π/2
D.
π

Detailed Solution for KIITEE Mock Test - 4 - Question 2

A common-emitter amplifier is shown in the figure (A).
In this Circuit , the output signal is an amplified version of the input signal and is 180 degrees out of phase with the input signal.

Common emitter Amplifier

Common Base Amplifier

Figure (B) is a common-base amplifier. In this circuit the output signal is an amplified version of the input signal and is in phase with the input signal. In both of these circuits, the output signal is controlled by the base-to-emitter bias. As this bias changes (because of the input signal) the current through the transistor changes.

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KIITEE Mock Test - 4 - Question 3

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Application of a forward bias to a p-n junction

A.
widens the depletion zone
B.
increases the no. of donors on the n-side
C.
increases the electric field in the depletion zone
D.
increases the potential difference across the depletion zone

KIITEE Mock Test - 4 - Question 4

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Pick out the incorrect statement regarding reverse saturation current in a p - n junction diode.

A.
This current doubles for every 100 ⁰C rise in temperature
B.
This current is due to minority carriers
C.
The current carriers are produced by thermal agitation
D.
Reverse saturation current is also known as leakage current

KIITEE Mock Test - 4 - Question 5

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The dominant mechanism for motion of charge carriers in forward and reverse biased silicon p-n junction are

A.
drift in forward bias, diffusion in reverse bias
B.
diffusion in forward bias, drift in reverse bias
C.
diffusion in both forward and reverse bias
D.
drift in both forward and reverse bias

KIITEE Mock Test - 4 - Question 6

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In an n-p-n transistor, p-acts as a/an

A.
base
B.
emitter
C.
collector
D.
none of these

KIITEE Mock Test - 4 - Question 7

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For a transistor working as common-base amplifier, the emitter current is 7.2 mA. If the current gain is 0.96, then the collector current is

A.
2.12 mA
B.
4.24 mA
C.
6.91 mA
D.
8.56 mA

KIITEE Mock Test - 4 - Question 8

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In a transistor, the emitter-base junction and the collector-base junction are

A.
forward and forward respectively
B.
reverse and reverse respectively
C.
reverse and forward respectively
D.
forward and reverse respectively

KIITEE Mock Test - 4 - Question 9

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If a half wave rectifier is used to convert 50HZ a.c into d.c number of pulses present in the rectified output voltage is

A.
25
B.
50
C.
75
D.
100

KIITEE Mock Test - 4 - Question 10

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The method of connecting the negative pole of battery to p - material and positive pole to n - material of a p - n junction is called

A.
Forward bias
B.
Onward bias
C.
Reverse bias
D.
Backward bias

KIITEE Mock Test - 4 - Question 11

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A zener diode works on the principle of

A.
zero bias
B.
reverse bias
C.
forward bias
D.
infinite bias

KIITEE Mock Test - 4 - Question 12

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If the lattice parameter for a crystalline structure is 3.6 Å , then the atomic radius in fcc crystal is

A.
1.27 Å
B.
1.81 Å
C.
2.10 Å
D.
2.92 Å

KIITEE Mock Test - 4 - Question 13

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In forward bias, the width of potential barrier in a p-n junction diode

A.
Increases
B.
Decreases
C.
Remains constant
D.
First increases then decreases

KIITEE Mock Test - 4 - Question 14

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In an intrinsic - semiconductor the charge carriers responsible for electrical conduction are

A.
Electrons
B.
Holes
C.
Both electrons and holes
D.
None

KIITEE Mock Test - 4 - Question 15

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The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be

A.
100
B.
90
C.
10
D.
1.25

KIITEE Mock Test - 4 - Question 16

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Following compounds are respectively ... geometrical isomers

A.
I = cis, II = trans, III = cis
B.
I = cis, II = trans, III = trans
C.
I = trans, II = cis, III = cis
D.
I = cis, II = cis, III = trans

Detailed Solution for KIITEE Mock Test - 4 - Question 16

In I and II both neighbouring Cl are on the same side, thus both of them are cis whereas for III, both Cl are on the opposite side. Thus, it is trans

So correct option is d) I = cis, II = cis, III = trans

KIITEE Mock Test - 4 - Question 17

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Percentage of lead in lead pencil is

A.
Zero
B.
20
C.
80
D.
70

KIITEE Mock Test - 4 - Question 18

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In any right angled triangle hypotenuse is equal to 2√2 times the perpendicular drawn from the opposite vertex on it, then other angles are

A.
(π/3),(π/6)
B.
(π/4),(5π/4)
C.
(π/8),(3π/8)
D.
(π/12),(5π/12)

KIITEE Mock Test - 4 - Question 19

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The general value of θ which satisfies tanθ=-1 and cosθ=(1/√2) the equations is

A.
nπ + (7π/4)
B.
nπ - (7π/4)
C.
2nπ + (7π/4)
D.
2nπ - (7π/4)

KIITEE Mock Test - 4 - Question 20

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The normal to the curve x = a(1+cosθ), y = a sinθ at θ always passes through the fixed point

A.
(0, 0)
B.
(0, a)
C.
(a, 0)
D.
(a, a)

Detailed Solution for KIITEE Mock Test - 4 - Question 20

Eliminating θ we get (x – a)² + y² = a²
Hence normal always pass through (a, 0)

KIITEE Mock Test - 4 - Question 21

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If √3 cos θ − sin θ = 1 then θ =

A.
π
B.
π/2
C.
π/3
D.
π/6

KIITEE Mock Test - 4 - Question 22

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If m₁, m₂ are slopes of the two tangents that are drawn from (2, 3) to the parabola y² = 4x, then the value of [(1/m₁) + (1/m₂)] is

A.
3
B.
-3
C.
2/3
D.
3/2

KIITEE Mock Test - 4 - Question 23

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Let p be a variable point on the ellipse [(x²/a²) + (y²/b²)] = 1 with foci F₁ and F₂. If A is area of triangle PF₁F₂, then the maximum value of A is

A.
(ea/b)
B.
aeb
C.
(ab/e)
D.
(e/ab)

KIITEE Mock Test - 4 - Question 24

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If sin2x+sin4x=2sin3x, then x=

A.
nπ
B.
nπ+(π/3)
C.
2nπ (π/3)
D.
nπ-(π/3)

Detailed Solution for KIITEE Mock Test - 4 - Question 24

KIITEE Mock Test - 4 - Question 25

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The equation of the parabola whose focus is (1,-1) and directrix is x + y + 7 = 0 is

A.
x²- 18x - 10y - 45 = 0
B.
x² + y² - 2xy - 18x - 10y = 0
C.
x²+ y² - 2xy - 18x - 10y - 45 = 0
D.
x² + y²- 18x - 10y - 45 = 0

KIITEE Mock Test - 4 - Question 26

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The locus of x²+y²+z²=0 is

A.
(0,0,0)
B.
a sphere
C.
a circle
D.
none of these

KIITEE Mock Test - 4 - Question 27

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If the pair of lines ax²+ 2hxy + by² + 2gx + 2fy + c = 0 intersect on the y-axis then

A.
2fgh = bg² + ch²
B.
bg² ≠ ch²
C.
abc = 2fgh
D.
none of these

KIITEE Mock Test - 4 - Question 28

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The radius of the circle
3x (x - 2) + 3y (y + 1) = 4 is

A.
2
B.
3
C.
√(15/4)
D.
√(31/12)

KIITEE Mock Test - 4 - Question 29

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Locus of mid point of the portion between the axes of x cosα + y sinα = p where p is constant is

A.
x² + y² = 4/p²
B.
x² + y² = 4p²
C.
(1/x²) + (1/y²) = 2/p²
D.
(1/x²) + (1/y²) = 4/p²

KIITEE Mock Test - 4 - Question 30

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If α is a root of 25cos²θ + 5cosθ - 12 = 0, (π/2)<α<π, then sin2α is equal to

A.
24/25
B.
-(24/25)
C.
13/18
D.
-(13/18)

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