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Most Important MCQ’s of Physics Part 1 ( Chapter 7-10 )

Most Important MCQ’s of Physics Part 1 ( Chapter 7-10 )
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Most Important MCQ’s of Physics Fsc Part 1

Most Important MCQ's of Physics Fsc Part 1

  1. A physical system undergoing forced vibrations is called
    • harmonic oscillator          (b) driven oscillator

(c) damped oscillator       (d) all of these

 

  1. The waves produced in a microwave oven have a frequency equal to
    • 2450 Hz                     (b) 2450 kHz

(c) 2450 MHz                             (d) none of these

 

  1. On increasing the amplitude of an oscillator twice, its energy
    • increases two times         (b) decreases two times

(c) decreases four times (d) increases four times

 

  1. The SI unit of force constant is the same as that of
    • force                               (b) pressure

(c) surface tension                    (d) stress

 

 

  1. When a particle is in uniform circular motion, its projection along the diameter axis executes
    • linear motion                   (b) circular motion

(c) vibratory motion                   (d) simple harmonic motion

 

  1. On shifting a simple pendulum from pole to equator, we notice
    • an increase in its time period
    • a decrease in its time period
    • a change in its mass
    • no change either in mass or time period

 

  1. What happens to the time period of a mass-spring system if the spring is replaced by a more stiff spring?
    • Increases                     (b) Decreases

(c) Remains the same      (d) Can not be predicted.

 

  1. The amplitude of a forced oscillator depends upon the
    • natural frequency of the oscillator
    • frequency of the driving force
    • amount of damping present
    • all of these

 

  1. A shock absorber is a
    • harmonic oscillator          (b) driven oscillator

(c) damped oscillator       (d) all of these

 

  1. In damped harmonic oscillator, the loss of energy is due to
    • the decrease in frequency of the oscillator
    • an increase of its time period
    • a decrease in its amplitude
    • all of these

 

  1. Sound waves do not travel in vacuum because these are
    • longitudinal waves          (b) composed of compressions

(c) mechanical waves      (d) low frequency waves

 

  1. In a stationary wave, the antinodes are located at
    • the ends                     (b) the middle

(c) between nodes           (d) anywhere

 

 

  1. When two identical waves are superimposed on each other, the velocity of the resultant wave
    • decreases                     (b) increases

(c) remains the same       (d) becomes zero

 

  1. Set of frequencies which are an integral multiple of the fundamental frequency are called
    • beat frequencies           (b) driving frequencies

(c) natural frequencies    (d) overtones

 

  1. The speed of sound in a medium depends upon
    • elasticity of the medium (b) density of the medium

(c) amplitude of sound    (d) both ‘a’ and ‘b’

 

  1. Which one of the following properties of sound is affected by a change in the temperature of air?
    • Frequency                     (b) Amplitude

(c) Wavelength                (d) Intensity

 

  1. When a wave enters a medium, which of its following parameters remains unchanged?
    • Wavelength           (b) Speed

(c) Frequency                            (d) Intensity

 

  1. The speed of distant stars and galaxies can be calculated by the use of
    • Doppler’s effect           (b) radar

(c) relativity                     (d) all of these

 

Most Important MCQ’s of Physics Fsc Part 1

 

  1. Light reaches Earth from the Sun in about
    • 15 ½ minutes                  (b) 10 minutes

(c) 8 ½ minutes               (d) 6 ½ minutes

 

 


 

  1. The danger signals are red while the eye is most sensitive to yellow because
    • scattering of yellow colour is less than that of red
    • red light is longer in wavelength than yellow light
    • scattering in red is less than in yellow
    • red colour is more intense than yellow

 

  1. The spreading of light after passing through a pinhole is called
    • dispersion                     (b) scattering

(c) diffraction                             (d) all of these

 

  1. The minimum distance between an object and its real image in a convex lens is
    • 2 f                               (b) 3 f

(c) 4 f                                        (d) 6 f

 

  1. When a convex lens of focal length f is immersed in a liquid of refractive index n less than that of the lens, then its focal length
    • decreases                        (b) increases

(c) remains the same       (d) becomes the same

 

  1. The ability of an instrument to reveal the minor details of an object is its
    • resolution                     (b) magnification

(c) resolving power                    (d) none of these

 

  1. The resolving power of an astronomical telescope depends upon
    • the focal length of the objective          (b) the focal length of eyepiece
    • the diameter of the objective lens.
    • the diameter of the eyepiece lens

 

  1. Multimode step index fibre is useful for
    • long distance
    • short distance
    • neither long nor short distance
    • neither of these

 

  1. The disadvantages of a step index fibre can be overcome by using
    • impurities in the fibre (b) graded index fibre

(c) a highly pure glass     (d) none of these

 

 

  1. The unit of magnifying power is
    • jolue                               (b) watt

(c) diopter                        (d) no unit

 

  1. The focal length and radius of curvature of a lens are related by
    • f = 2R                              (b) R = 2f

(c) R = f                                     (d) none of these

 

Most Important MCQ’s of Physics Fsc Part 1

  1. The Avogadro number represents the number of atoms

in

  • 1 kg of a substance         (b) unit volume of a substance

(c) 1 mole of a substance          (d) total amount of a substance

 

  1. Molecules of a mono atomic gas possess
    • rotational motion (b) vibrational motion

(c) translational motion    (d) all of these

 

  1. A closed system is one in which
    • the energy of the system remains constant
    • the mass of the system remains the same
    • both mass and energy of the system remain the same
    • nether mass nor energy remain the same

 

  1. In a thermodynamical process the change in internal energy depends upon (a) the initial state only
    • the final state only
    • the path followed by the change
    • the initial and the final state

 

  1. The equation PV? = constant holds in
    • isothermal process           (b) isochoric process

(c) adiabatic process                  (d) all of these

 

  1. In a Carnot engine, the final temperature of the working substance is
    • greater than its initial temperature
    • smaller than its initial temperature
    • equal to its initial temperature
    • zero

 

  1. The working substance of a Carnot engine is
    • source                              (b) sink

(c) petrol                          (d) ideal gas

 

  1. Upon decreasing the temperature of the sink, the efficiency of the Carnot engine
    • decreases                        (b) does not change

(c) increases                              (d) none of these

 

  1. When the temperature of source and the sink become equal the change in entropy of a Carnot engine becomes
    • zero                               (b) minimum

(c) maximum                             (d) negative

 

  1. All real heat engines are less efficient than a Carnot engine due to
    • working substance
    • temperature of the reservoirs
    • friction and heat losses
    • all of these
  1. The unit of thermodynamic temperature is
    • K                                      (b) OF

(c) OC                               (d) none of these

Most Important MCQ’s of Physics Fsc Part 1

  1. Human metabolism provides a good example of
    • mass conservation
    • energy conservation
    • entropy conservation
    • none of these

 

  1. The increase in thermal pollution of environments means
    • a decrease in entropy
    • an increase in entropy
    • constant entropy
    • none of these

 

  1. Upon shifting a simple pendulum from Karachi to Mount

Everest, its natural frequency

  • increases                     (b) decreases

(c) remains the same       (d) none of these

 

  1. Under similar conditions of temperature and pressure, the velocity of sound will be maximum in
    • oxygen                            (b) hydrogen.

(c) nitrogen                     (d) carbon dioxide

 

  1. Presence of moisture in air
    • increases the velocity of sound
    • decreases the velocity of sound
    • has no effect on the speed of sound
    • none of these

 

  1. A string of length l fixed at both ends is plucked from its middle so that it vibrates in one loop. The

wavelength of the wave in this mode is

  • l/2                               (b) l

(c) 2l                                (d) l/4

 

  1. The ratio of the fundamental frequency of a organ pipe open at both ends to an organ pipe closed at both ends is
    • 2:1                               (b) 1:2

(c) 1:1                                       (d) 3:1

  1. When a simple pendulum swings, which of the following quantities is not zero throughout the motion?
    • Acceleration           (b) Speed

(c) Weight                       (d) Momentum

 

  1. A string with one end fixed is being whirled from the other free end so that it vibrates with the fundamental frequency of 20 Hz. Its next harmonic has a frequency equal to
    • 40 Hz                     (b) 60 Hz

(c) 10 Hz                          (d) neither of these

 

  1. In an interference pattern
    • bright fringes are wider than dark fringes
    • dark fringes are wider than the bright fringes
    • both dark and bright fringes are of equal width
    • none of these

 

  1. In a diffraction pattern, the fringes are
    • equally spaced
    • wider near the object and narrower away from it
    • narrower near the object and wider away from it
    • none of these

 

  1. The Celsius and Fahrenheit scales have the same reading at
    • 40o                               (b) 140o                     

(c) ??40o                                   (d) ?140o

 

  1. Absolute zero is considered to be the temperature at which
    • all gases become liquid
    • all liquids become solid
    • water freezes
    • molecular motion in gases ceases

 

  1. Which of the followings do not have the same units?
    • Mechanical energy
    • Kinetic energy                       
    • Heat energy
    • Power

 

KEY TO GRAND TEST CHAPTERS 7 –11

 

 

1 b 21 c 41 d
2 c 22 c 42 c
3 d 23 a 43 c
4 c 24 c 44 c
5 d 25 b 45 a
6 b 26 c 46 b
7 a 27 c 47 b
8 d 28 b 48 b
9 a 29 c 49 b
10 b 30 c 50 b
11 b 31 a 51 b
12 d 32 b 52 c
13 c 33 c 53 a
14 d 34 b 54 c
15 c 35 c 55 b
16 c 36 c 56 c
17 d 37 c 57 b
18 c 38 d 58 c
19 d 39 c 59 D
20 d 40 c 60 D

 

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