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SRMJEE Mock Test (Engg) - 1 - JEE MCQ


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30 Questions MCQ Test - SRMJEE Mock Test (Engg) - 1

SRMJEE Mock Test (Engg) - 1 for JEE 2024 is part of JEE preparation. The SRMJEE Mock Test (Engg) - 1 questions and answers have been prepared according to the JEE exam syllabus.The SRMJEE Mock Test (Engg) - 1 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for SRMJEE Mock Test (Engg) - 1 below.
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SRMJEE Mock Test (Engg) - 1 - Question 1
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The capacity of a pure capacitor is 1 farad. In D.C. circuits, its effective resistance will be

SRMJEE Mock Test (Engg) - 1 - Question 2
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What percentage of original radioactive atoms is left after five half lives ?

Detailed Solution for SRMJEE Mock Test (Engg) - 1 - Question 2
After 1, 2, 3, 4 half lives the percentage of original radioactive atoms left will be
50%, 25%, 12.5%, 6.25%.
So after 5 half lives the percentage of original radioactive atoms left will be
3.125%
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SRMJEE Mock Test (Engg) - 1 - Question 3
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A car is initially at rest on a circular track that has a radius of 40 m. The car then starts to move counter clockwise around the track, accelerating at constant angular acceleration of 1.0 rad/s2. The time it takes for the car to move half of the way around the track is

SRMJEE Mock Test (Engg) - 1 - Question 4
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A mass m falls freely from rest. The linear momentum after it has fallen through a height h is
SRMJEE Mock Test (Engg) - 1 - Question 5
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Two cells of the same emf are in series with an external resistance R. The internal resistance r1 is greater than r2. The p.d across the first cell is found to be zero. Then the value of R is
Detailed Solution for SRMJEE Mock Test (Engg) - 1 - Question 5

Current in the circuit

 

I = 2E​ / (R+r1​+r2​)

∴ Potential difference across first cell

 

V= E−Ir

= E − 2Er1 / (R+r1​+r2​)

 

On solving we get, 

R = (r1​−r2​)

SRMJEE Mock Test (Engg) - 1 - Question 6
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Cathode rays are similar to visible light rays in that
SRMJEE Mock Test (Engg) - 1 - Question 7
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A wire of diameter 1 mm breaks under a tension of 1000 N. Another wire, of same material as that of the first one, but of diameter 2 mm breaks under a tension of
SRMJEE Mock Test (Engg) - 1 - Question 8
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A transformer is used to reduce the mains supply of 220 V to 11 V. If the currents in primary and secondary coils are 5 A and 90 A respectively, efficiency of transformer is
Detailed Solution for SRMJEE Mock Test (Engg) - 1 - Question 8
HT side Power = Vp(Primary Voltage) x Ip(Primary Current) = 220 x 5 = 1100 W

LT side Power = Vs(Secondary Voltage) x Is(Secondary current) = 11 x 90 = 990 W

Loss = HT side Power -  LT side Power = 1100-990 = 110 W Or Loss(in %) = (Loss/HT side Power) = 110/1100 = 10%

Efficiency = 100-10 = 90%
SRMJEE Mock Test (Engg) - 1 - Question 9
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If a transistor amplifier has a gain of 20 dB, then the ratio of output to input power is
SRMJEE Mock Test (Engg) - 1 - Question 10
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A charge q is located at the centre of a cube. The electric flux through any face is
SRMJEE Mock Test (Engg) - 1 - Question 11
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A cube of weight 10N rests on a rough inclined plane of slope 3 in 5. The coefficient of friction is 0.6. The minimum force necessary to start the cube moving up the plane is
SRMJEE Mock Test (Engg) - 1 - Question 12
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The acceleration on the surface of earth varies
SRMJEE Mock Test (Engg) - 1 - Question 13
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For Boyle's law to hold the gas should be
SRMJEE Mock Test (Engg) - 1 - Question 14
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If a liquid is heated in weightlessness, the heat is transmitted through
SRMJEE Mock Test (Engg) - 1 - Question 15
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If a force of 250 N act on body, the momentum acquired is 125 kg m/s, what is the period for which force acts on the body.
SRMJEE Mock Test (Engg) - 1 - Question 16
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A current carrying circular loop is freely suspended by a long thread. The plane of the loop will point in the direction
SRMJEE Mock Test (Engg) - 1 - Question 17
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A ferromagnetic material is heated above its Curie temperature. Which one is a correct statement ?
SRMJEE Mock Test (Engg) - 1 - Question 18
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In a container, the velocity of water flowing through a hole at a depth h from the surface of water is 5 m-s⁻1. If the container has the hole at a depth 4h from the surface of water, then velocity of water flowing through the hole is
SRMJEE Mock Test (Engg) - 1 - Question 19
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A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t sec is proportional
SRMJEE Mock Test (Engg) - 1 - Question 20
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The length of second's hand in a watch is 1 cm. The change in velocity of its tip in 15 seconds is
Detailed Solution for SRMJEE Mock Test (Engg) - 1 - Question 20
speed of tip of second hand is constant =2π*1/60  cm/sec
=π/30  cm/sec
so in 15 sec it will rotate by an angel 90 degree
initial velocity = π/30 i
final velocity = π/30(-j)
change in velocity = | π/30(-j)  - π/30 i|
=π√2/30  cm/sec
SRMJEE Mock Test (Engg) - 1 - Question 21
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Two bodies of mass 3 kg and 4 kg are suspended at the ends of massless string passing over a frictionless pulley. The acceleration of the system is (g=9.8 m/s2)
SRMJEE Mock Test (Engg) - 1 - Question 22
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The period of simple pendulum is doubled, when
SRMJEE Mock Test (Engg) - 1 - Question 23
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A body is projected at such an angle that the horizontal range is three times the greatest height. The angle of projection is
SRMJEE Mock Test (Engg) - 1 - Question 24
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10 cm long wire is placed horizontally on the surface of water and is gently pulled up with a forceof 2 x 10⁻2N to keep the wire in equilibrium. The surface tension of water in N/m is
SRMJEE Mock Test (Engg) - 1 - Question 25
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A ray of light strikes a glass plate at an angle θ. If angle between the reflected and refracted rays is a right angle, then refractive index of the glass plate is given by
SRMJEE Mock Test (Engg) - 1 - Question 26
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A consatnt torque of 31.4 N-m is exerted on a pivoted wheel. If angular acceleration of wheel is 4π rad/s2, then the moment of inertia of the wheel is
SRMJEE Mock Test (Engg) - 1 - Question 27
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The length of the second's hand in a watch is 1 cm. The magnitude of the change in the velocity of its tip in 15 s is
Detailed Solution for SRMJEE Mock Test (Engg) - 1 - Question 27

In 15s the hand moves through 90º.
If the speed of the tip is v, then


SRMJEE Mock Test (Engg) - 1 - Question 28
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An electric lamp is marked 60 W, 230 V. The cost of a 1 Kwh of energy is Rs. 1.25. The cost of using this lamp 8 hrs a day for 30 days is
Detailed Solution for SRMJEE Mock Test (Engg) - 1 - Question 28
Given that lamp consumes 60 w per hour
,power consumed per day =>60×8=480watts
.,power consumed per month =>480×30=14400
=>14.4 kilo watts.
total cost =>14.4×1.25=18rupees
SRMJEE Mock Test (Engg) - 1 - Question 29
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Radius of a soap bubble is\'r\', surface tension of soap solution is T. Then without increasing the temperature, how much energy will be needed to double its radius?
SRMJEE Mock Test (Engg) - 1 - Question 30
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When a copper sphere is heated, maximum percentage change will be observed in
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