Physics Mcqs Test Preparation for ECAT & MCAT - Set 15

1)   Concentration of red cells in blood is about

a. 25%
b. 40%
c. 50%
d. 75%
Answer  Explanation 

ANSWER: 50%

Explanation:
No explanation is available for this question!


2)   A man standing near a fast moving train may fall

a. on the train
b. away from the train
c. towards the train
d. on himself
Answer  Explanation 

ANSWER: towards the train

Explanation:
No explanation is available for this question!


3)   Two fog droplets have radius 2:3 their terminal velocities are

a. 4:06
b. 4:09
c. 2:09
d. 4.3
Answer  Explanation 

ANSWER: 4:09

Explanation:
No explanation is available for this question!


4)   Burnoullis equation is obtained by applying law of conservation of

a. mass
b. energy
c. momentum
d. fluid
Answer  Explanation 

ANSWER: energy

Explanation:
No explanation is available for this question!


5)   Venturi meter is used to measure

a. fluid pressure
b. fluid density
c. fluid speed
d. none
Answer  Explanation 

ANSWER: fluid speed

Explanation:
No explanation is available for this question!


6)   In cricket when a bowler produce reverse swing the ball will move towards

a. shinning side of the ball
b. rough side
c. seam of the ball
d. goes straight
Answer  Explanation 

ANSWER: shinning side of the ball

Explanation:
No explanation is available for this question!


7)   Stokes law is applicable if body has ________shape

a. rough
b. square
c. circular
d. spherical
Answer  Explanation 

ANSWER: spherical

Explanation:
No explanation is available for this question!


8)   One torr is equal to

a. 1.333 Nm-2
b. .1333 Nm-2
c. 13.33 Nm-2
d. 133.3 Nm2
Answer  Explanation 

ANSWER: 133.3 Nm2

Explanation:
No explanation is available for this question!


9)   Systolic pressure is called

a. low blood pressure
b. high blood pressure
c. normal blood pressure
d. abnormal blood pressure
Answer  Explanation 

ANSWER: high blood pressure

Explanation:
No explanation is available for this question!


10)   Instrument used to measure blood pressure is called

a. venturimeter
b. blood pressure
c. sphgmomanometer
d. sonometer
Answer  Explanation 

ANSWER: sphgmomanometer

Explanation:
No explanation is available for this question!


11)   A chimney works works best if air exposed to the chimmey is

a. stationary
b. moving
c. moving slowly
d. moving fast
Answer  Explanation 

ANSWER: moving fast

Explanation:
No explanation is available for this question!


12)   The effect of the decrease in pressure with the increase of the speed of fluid in a horizontal pipe is known as

a. Bernoullirt effect
b. Torricelli effect
c. Venturi effect
d. Stokes effect
Answer  Explanation 

ANSWER: Venturi effect

Explanation:
No explanation is available for this question!


13)   Ideal fluid is

a. non-viscous
b. incompressible
c. steady flow
d. possess all properties
Answer  Explanation 

ANSWER: possess all properties

Explanation:
No explanation is available for this question!


14)   Laminar flow usually occurs at speeds.

a. low
b. high
c. very high
d. some time high and some time low
Answer  Explanation 

ANSWER: low

Explanation:
No explanation is available for this question!


15)   For _________ flow the path of the fluid particles cannot be tracked.

a. laminar
b. stream line
c. turbulent
d. both (a) and (b)
Answer  Explanation 

ANSWER: turbulent

Explanation:
No explanation is available for this question!


16)   Sphygmomanometers measures blood pressure.

a. statically
b. dynamically
c. some time static and some time dynamic
d. none of these
Answer  Explanation 

ANSWER: dynamically

Explanation:
No explanation is available for this question!


17)   Carburetor of a car is a application of

a. Venturi meter
b. Bernoulli equation
c. Both (a) and (b)
d. None
Answer  Explanation 

ANSWER: Both (a) and (b)

Explanation:
No explanation is available for this question!


18)   The blood flow is ____________ flow at disystolic pressure

a. laminar
b. turbulent
c. mixed
d. none
Answer  Explanation 

ANSWER: laminar

Explanation:
No explanation is available for this question!


19)   The profile of aeroplane wing which lifts it up is called as

a. wing shape
b. aerofoil profile
c. curved profile
d. none of these
Answer  Explanation 

ANSWER: aerofoil profile

Explanation:
No explanation is available for this question!


20)   Bernoullis equation is applicable for

a. laminar flow
b. turbulent flow
c. both laminar and turbulent flow
d. none of these
Answer  Explanation 

ANSWER: both laminar and turbulent flow

Explanation:
No explanation is available for this question!


21)   The density of human blood is nearly equal to

a. water
b. honey
c. mercury
d. oil (kerosene)
Answer  Explanation 

ANSWER: water

Explanation:
No explanation is available for this question!


22)   The speed of the fluid is maximum in the venturimeter at

a. convergent duct
b. divergent duct
c. throat
d. none of these
Answer  Explanation 

ANSWER: throat

Explanation:
No explanation is available for this question!


23)   The normal blood pressure range for an human body is

a. 120 to 80 torr
b. 100 to 80 torr
c. 120 to 60 torr
d. 60 to 140 torr
Answer  Explanation 

ANSWER: 60 to 140 torr

Explanation:
No explanation is available for this question!


24)   Optical active crystals rotates the

a. vibrating plane
b. polarization plane
c. diffraction plane
d. interference plane
Answer  Explanation 

ANSWER: polarization plane

Explanation:
No explanation is available for this question!


25)   Which is not optically active?

a. sugar
b. tartaric acid
c. water
d. sodium chlorate
Answer  Explanation 

ANSWER: water

Explanation:
No explanation is available for this question!


26)   In double slit experiment we observe

a. interference fringes only
b. diffraction fringes only
c. both interference and diffraction fringes
d. polirized frringes
Answer  Explanation 

ANSWER: both interference and diffraction fringes

Explanation:
No explanation is available for this question!


27)   When light incident normally on thin film the path difference depends upon

a. thickness of the film only
b. nature of the film only
c. angle of indidence only
d. all thickness nature and angle of incidence
Answer  Explanation 

ANSWER: all thickness nature and angle of incidence

Explanation:
No explanation is available for this question!


28)   Which one of the following properties of light does not change with the nature of the medium?

a. velocity
b. wavelength
c. amplitude
d. frequency
Answer  Explanation 

ANSWER: frequency

Explanation:
No explanation is available for this question!


29)   Light reaches the earth form sun in nearly

a. 15 minutes
b. 10 minutes
c. 8 minutes
d. 8 minutes 30 seconds
Answer  Explanation 

ANSWER: 8 minutes 30 seconds

Explanation:
No explanation is available for this question!


30)   Photoelectric effect was given by

a. Hertz
b. Fresnel
c. Einstein
d. Plank
Answer  Explanation 

ANSWER: Einstein

Explanation:
No explanation is available for this question!


31)   According to Einstein light travels form one place to another in the form of

a. waves
b. particles
c. photons
d. it was not his discovery
Answer  Explanation 

ANSWER: photons

Explanation:
No explanation is available for this question!


32)   Longitudinal waves do not exhibit

a. reflection
b. refraction
c. diffraction
d. polarization
Answer  Explanation 

ANSWER: polarization

Explanation:
No explanation is available for this question!


33)   Central spot of Newtons rings

a. bright
b. dark for large wavelength
c. dark
d. bright for large wavelength
Answer  Explanation 

ANSWER: bright

Explanation:
No explanation is available for this question!


34)   A point source of light placed in a homogeneous medium gives rise to

a. a cylindrical wave front
b. an elliptical wave front
c. a spherical wave front
d. a plane wave front
Answer  Explanation 

ANSWER: a spherical wave front

Explanation:
No explanation is available for this question!


35)   The locus of all points in a medium having the same phase of vibration is called

a. crest
b. trough
c. wavelength
d. wave front
Answer  Explanation 

ANSWER: wave front

Explanation:
No explanation is available for this question!


36)   Two sources of light are coherent if they emit rays of

a. same wavelength
b. same amplitude of vibration
c. same wave length with constant phase difference
d. same amplitude and wavelength
Answer  Explanation 

ANSWER: same wave length with constant phase difference

Explanation:
No explanation is available for this question!


37)   When crest of one wave falls over the trough of the other wave this phenomenon is known as

a. polarization
b. constructive interference
c. destructive interference
d. diffraction
Answer  Explanation 

ANSWER: destructive interference

Explanation:
No explanation is available for this question!


38)   In Young double slit experiment, if white light is used

a. alternate dark and bright fringes will be seen
b. coloured fringes will be seen
c. no interference fringes will be seen
d. impossible to predict
Answer  Explanation 

ANSWER: coloured fringes will be seen

Explanation:
No explanation is available for this question!


39)   The velocity of light was determined accurately by

a. Newton
b. Michelson
c. Huygen
d. Young
Answer  Explanation 

ANSWER: Michelson

Explanation:
No explanation is available for this question!


40)   In an interference pattern

a. bright fringes are wider than dark fringes
b. dark fringes are wider than bright fringe
c. both dark and bright fringes are of equal width
d. central fringes are brighter than the outer fringes
Answer  Explanation 

ANSWER: both dark and bright fringes are of equal width

Explanation:
No explanation is available for this question!