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Thread: MCQS Practice ; Physics
 February 26th, 2015, 09:45 PM #1
MCQS Practice ; Physics
1The law of conservation of energy gives us :
a)Equation of continuity
b)Bernoulli’s theorem
c)Both
d)None
2SI units of flow rate are :
a)m2 s1
b)m3 s2
c)m3 s1
d)m2 s2
3The unit of viscosity is :
a)Nsm2
b)kg m1 s1
c)1 x 10^3 g m1 s1
d)All
e)both a & b
4The max speed at which the drag force varies directly is 20 m/s and force is 120 pi N while n =1 & r = 1 m,Now the speed exceeds its maximum value i.e 25 m/s for direct proportionality with Force n=1 r=1 then the new value of drag force is :
a)150 pi N
b)160 pi N
c)170 pi N
d)180 pi N
e)None as direct proportionality doesnt exist after 20m/s
5Water is flowing through an open pipe and every particle is following the exact same path as followed by previous particles,Suddenly a stone is dropped into the water say at point P then the flow of water at point P is :a)Streamlineb)Turbulentc)Steady flowd)Can't be predicted
6The area of pipe entrance for water entering at 1 m/s is 1 m2 while the area of the point from where water is going out at 2 m/s is ½ m2,the volume flowing out per second is :
a)3 m3s1
b) 2 m2s1
c) 1 m2s1
d)None
7There is a pipe whose one end is placed at some height related to other end at ground and say the constant pressure is being exerted on both ends while the fluid through it is flowing with some constant speed,the fundamental relation to express all three factors is :
a)Toricelli’s theorem
b)Venturi Relation
c)Bernoulli’s Equation
d)Equation of continuity
8If the concentration of red blood cells in our blood is lessened to the value of 35 % then the viscosity of blood will be :
a)More than 3 times
b)More than 5 times
c)Less than 3 times
d)None
9Angular velocity of a body executing SHM is 1 rads2 then the Time period for one vibration will be :
a)3 pi
b)2 pi
c)1 pi
d)None
10In a horizontal mass spring system the velocity of spring of mass 10 kg is 1 m/s while the maximum velocity is 10 m/s while spring constant is 10,find the amplitude of this system that spring will attain in its vibration :
a)100 m
b)10 m
c)1 m
d)Not Possible
11The bob of a simple pendulum is displaced from mean position and hence the distance covered x is 10 m and the length of the string with which the bob is attached is 10 m,if bob is released from point x then bob will accelerates towards mean position with acceleration of :
a)100 ms2
b)10 ms2
c)10ms2
d) None
12At point A Potential Energy is maximum for Horizontal mass spring system and at point B the Kinetic energy is maximum at intermediate point say C the energy is :
a)P.E
b)K.E
c)Both
d)None
13As we go near active lava hill we feel ground trembling under our feet due to natural phenomena and if we start drilling at that spot where we are standing then more vibrations are being produced then we can say that ____ oscillations are present at the spot where we are drilling hard in the ground :
a)Free
b)Forced
c)Damped
d)None
e)Both are present at the same time
14The wavelength of light used in oven is :
a)10 cm
b) 12 cm
c)14 cm
d)16 cm
15Range of hearing for dog is :
a)2020,000
b)5050,00
c)1515,000
d)None“So many of our dreams at first seem impossible, then they seem improbable, and then, when we summon the will, they soon become inevitable.”
Christopher Reeve  March 6th, 2015, 10:21 AM #2
Electronics & Current Electricity
1The electronic circuits which perform various logic operations are called :
a)Series Circuits
b)Parallel Circuits
c)Digital Circuits
d)Logic gates
2The output of a two input OR gate is 0 only when :
a)Both inputs are 0
b)Both inputs are 1
c)Both inputs are 2
d)Either input is 1 other is 0
3The output of two input AND gate has an output 1 only when :
a)Both inputs are 3
b)Both inputs are 1
c)Either input is 1
d)Either input is 0
4The logic circuit which inverts the input signal is :
a)OR gate
b)AND gate
c)NOT gate
d)NOR gate
5The production of electrons in a cathode ray tube is :
a)From a radioactive source
b)By ionization of air
c)By heating filament
d)None
6A sinusoidal trace is observed on a CRO Screen.For this alternating potential was given to :
a)X plates
b)Cathode
c)Anode
d)The Y Plates
7With help of CRO we can measure :
a)Voltage
b)Frequency
c)Phase
d)None
e)All
8 The Current flowing through a conductor is directly proportional to the potential difference ; It is shown as :
a) I directly proportional to V
b) Vdirectly proportional to I
c) I directly proportional to R
d) R directly proportional to V
9If voltage applied is 10 V and the current flowing is 10 A then the resistance in OHM is :
a)100 ohm
bb)1 ohm
cc)20 ohm
dd)None
10Filament is a :
aa)Ohmic
bb)Non Ohmic
cc)Can’t be predicted
dd)None
   Updated   
16 Doppler effect shows that change in frequency is :
a)Permanent
b)Temporary
c)Apparent
d)Both b & c
17 In water the speed(ms1) of sound at 20*C is :
a)258
b)315
c)352
d)None
18Find the temperature at which the velocity of sound in air is 2 times of its velocity at 10*C :
a)859*C
b)1132 K
c)Both
d)None
19An observer is moving towards a stationary object emitting waves of frequency 1 Hz with velocity 4m/s ,The relative velocity of waves with respect to observer is 12 m/s then the modified frequency is given as :
a)9 Hz
b)6 Hz
c)3 Hz
d)None
20If source is moving towards the observer with velocity us then in 10 seconds the waves are compressed by an amount known as :
a)Rontengen Shift
b)Doppler Shift
c)Both
d)None
21Ultrasound waves are directed towards the artery and the signat detected is :
a)Forward scattered
b)Back Scattered
c)Front Scattered
d)None
22When the blood is monitored through ultrasound then the frequency depends upon :
a)Blood density
b)Blood Concentration
c)Blood Flow
d)None
23NaCl gives pure yellow light in flame it is :
a)Coherent
b)MonoChromatic
c)Both
d)None
24XRays show the phenomena of diffraction this shows that Xrays :
a)Are Electromagnetic waves
b)Similar to light
c)Shorter wavelength
d)None
25 The focal length of the objective used in a compound microscope is
a) Large
b) Small
c) same as eye piece
d) intermediate
26There are how many types of optical fibres :
a)1
b)2
c)3
d)None“So many of our dreams at first seem impossible, then they seem improbable, and then, when we summon the will, they soon become inevitable.”
Christopher ReeveThread Information
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