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Quiz 1
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Q.1
Consider the following two statement Statement A: If heat is added to the system,it temperature must increase Statement B: If dW >0 then dV >0 Which of the below is correct option
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A & B both are correct
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A is correct only
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B is correct only
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A &B both are wrong
Q.2
The displacement of a particle having wave motion given by $ y=cos^2(t/4) sin(50t)$ This expression may be considered to be a result of the superposition of how many wave motions
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One
0%
Two
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Three
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Four
Q.3
There are two statement about Ideal gases Statement A: The $V_{rms}$ of gas molecules depends on the mass of the gas molecule and the temperature Statement B : The $V_{rms}$ is same for all the gases at the same temperature which one of the following is correct
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A & B both are correct
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A is correct only
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B is correct only
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A &B both are wrong
Q.4
A metallic sphere has a cavity of diameter D at its center.If the sphere is heated,the diameter of the cavity will
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Decrease
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Increase
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Remain unchanged
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None of the above
Q.5
The horizontal and vertical displacement of the projectile at time t are $x=36t$ $y=48t-4.9t^2$ where x and y are in meters and t in second. Initial velocity of the projectile in m/s
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15
0%
30
0%
45
0%
60
Q.6
A boy playing on the roof of a 10 m high building throws a ball with a speed of 10 m/s at an angle of 30° with the horizontal. How far from the throwing point will the ball be at the height of 10 m from the ground? take g = 10 m/s2
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5.20 m
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4.33 m
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2.60 m
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8.66 m
Q.7
A transverse wave in a medium is described by the equation $y=A sin^2(\omega t-kx)$. The magnitude of the maximum velocity of particles in the medium is equal to that of the wave velocity.if the value of A is
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$ \frac {\lambda}{2 \pi}$
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$ \frac {\lambda}{4 \pi}$
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$ \frac {\lambda}{ \pi}$
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$ \frac { 2 \lambda}{ \pi}$
Q.8
A charge q is placed at the center of the line joining two equal charges Q.The system of three charges will be in equilibrium if q equal is?
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-Q/2
0%
Q/2
0%
Q/4
0%
-Q/4
Q.9
A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5 m/s2, the reading of the spring balance will be
0%
24 N
0%
74 N
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15 N
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49 N
Q.10
A block of mass M is pulled along a horizontal friction surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block is
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$\frac {Pm}{m+M}$
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P
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$ \frac {PM}{m+M}$
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$ \frac {Pm}{M-m}$
Q.11
The displacement of particle is as per equation $y=at^2+bt+c$ Find the acceleration at time t=0
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2a
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b
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c
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2a+b
Q.12
A particle moves such that $x=a sin \omega t$ and $y =b cos \omega t$ what is the trajectory of the particle?
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Eclipse
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circle
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straight line
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parabola
Q.13
A line source emits a cylindrical wave.if the medium absorbs no energy,the amplitude will vary with distance y from the source as proportional to
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$y^{-1}$
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$y^{-2}$
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$\frac {1}{ \sqrt {y}}$
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$ \sqrt {y}$
Q.14
find the maximum attainable temperature of ideal gas when gas undergoes through the process $P=P_0-aV^2$
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$ \frac {2P_0}{3R} \sqrt { \frac {P_0}{3a}}$
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$ \frac {2P_0}{R} \sqrt { \frac {P_0}{3a}}$
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$ \frac {P_0}{R} \sqrt { \frac {P_0}{a}}$
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$ \frac {P_0}{R} \sqrt { \frac {P_0}{2a}}$
Q.15
Two masses $m_1 = 6$ kg and $m_2 = 14$ kg tied to a string are hanging over a light friction-less pulley. What is the acceleration of the masses when lift free to move?(g = 10 m/s2)
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4 m/s2
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2 m/s2
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3 m/s2
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1 m/s2
Q.16
which of these is not true for adiabatic process ?
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dQ=0
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dU+dW=0
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dT=0
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Molar specific heat is zero
Q.17
which of these is inertial frame of reference?
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A observer in car slowing down
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A observer in train speeding up
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A observer in car in uniform circular motion
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A observer in cycle moving with constant velocity.
Q.18
Find the number of electrons in 5 Coulomb?
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$31.25 \times 10^{18}$
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$31.5 \times 10^{18}$
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$31 \times 10^{18}$
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$32.25 \times 10^{18}$
Q.19
Consider the following two statement Statement A: Work done in a closed loop by electrical force is zero Statement B:The force on one charge due to another charge is not affected by the presence of other charges near by. Which of the below is correct option?
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A & B both are correct
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A is correct only
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B is correct only
0%
A & B both are wrong
Q.20
What is not true of uniform circular motion ?
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Centripetal force=$\frac {mv^2}{R}$
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angular velocity=$ \frac {v}{r}$
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angular acceleration >0
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Speed is constant
Q.21
An circular coil of radius R consists of N turns of wire.The current in the wire is I.Let B is the magnetic field at the center of the coil Which of the following is true
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$B= \frac {\mu _0NI}{R}$
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$B= \frac {\mu _0I}{2R}$
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$B= \frac {\mu _0NI}{4R}$
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none of these
Q.22
A hollow metal sphere of radius 10 cm is charged such that potential on its surface is 10 V Four statement are stated STATEMENT -1: The Potential at the center is 10 V STATEMENT -2: All the charged reside at the outer surface STATEMENT -3: Potential at a point 5 cm away from the surface is 10 V STATEMENT -4: Potential at a point 5 cm from the center of the sphere is 10 V which one of the following is correct
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All the statement are correct
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Statement 1,2 and 4 are correct
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Statement 1,2 and 3 are correct
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Statement 2,3 and 4 are correct
Q.23
A spring weighing machine inside a stationary lift read W N weight when a stone is kept on it.What will be the reading when the lift start moving downward with acceleration a
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$W(1- \frac {a}{g})$
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$W(1 + \frac {a}{g})$
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W
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none of these
Q.24
A train sounds its whistle as it approaches and leaves a station.An man at the station measures a frequency of 200 Hz as the train approaches and a frequency of 180 Hz as the train leave.Find the speed of the train. Speed of the sound is given as 340 m/s
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17.89 m/s
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19.89 m/s
0%
16.91 m/s
0%
17 m/s
Q.25
An electron(charge = $1.6 \times 10^{-19}$ C) moves with a speed $2 \times 10^6$ m/s along the positive x- direction in a magnetic Field B=(i-3j-4k) tesla. Force experienced by the electron in Newton
0%
$1.6 \times 10^{-12}$ N
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$1.4 \times 10^{-12}$ N
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$1.6 \times 10^{-13}$ N
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$1.2 \times 10^{-12}$ N
Q.26
Boyle's law is an example of a ?
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Latent Heat Process
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Isothermal Process
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Adiabatic Process
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Isochoric Process
Q.27
According to Kirchhoff's Ist law ,the algebraic sum of the currents flowing towards a branch point is
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greater then zero
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equal to zero
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greater or less than zero
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less than zero
Q.28
If the change in the value of g at height H above the surface of the earth is the same as that at a depth D below it, then (both h and d are much smaller than the radius of the earth) the ratio $ \frac {H}{D} + \frac {D}{H}$ is
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1/2
0%
3/2
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2
0%
5/2
Q.29
A body of 1 kg is acted by the following forces F1=2i+3j+4k F2=4i-3j-(24)1/2k F3=-2i+3j-4k Find the magnitude of the acceleration
0%
7
0%
4
0%
3
0%
10
Q.30
A particle is moving in the x-y plane with $x=at$ $y=bt^2$ where a and b are constant Find the trajectory of the particle?
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Parabola
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Circle
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Straight line
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none of these
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