PHYSICS MCQS | MEASUREMENT

PHYSICS MCQS

The Most Important Physics Mcqs which are used in every type of competitive examination is stated as under;-

1. Which branch of science is more quantitative but less qualitative ___________________________.

a. Physics
b. Chemistry
c. Botany
d. Zoology

2. The standard with which the physical quantities are compared is called __________________________.

a. Measurement
b. A unit
c.  Magnitude
d. Dimension

3. Which one of the following is not a unit of time?

a. A day
b. A light year
c.  A month
d.  An hour

4. The angle made in radian by simple pendulum per second vibrating with 20 cycle per second is _______________________

a. 2 TT
b. 20TT

c. 40TT
d. 10TT

5. Which one of the following is a dimensionless physical quantity?

a. Coefficient of friction
b. strain
c.  Angular displacement
d. All a, b and c

6.  The angle subtended at the center of a circle by an arc of length 1/360 of the circumference of the circle is known as ______

a. Minute
b. Second
c.  Degree
d. Radian

7.         Angle made in radian by minutes hand of a watch in 10 minutes will be ______________________________

a.  TT /3

b.  TT /6
c. 2TT /3
d.         5TT /3

8.  In the equation, F = Aa3, A is a constant and a being acceleration. The dimensions of A will be __________________________

a. MT4
b. MT4 c2
c. MLT4
d. Ml-4

9.  The angle made by an area of a sphere equal to the square of its radius at its center is ________________________________

a. One degree
b. One radian
c.  One revolution
d. One steradian

10. The standard way of writing the mass of proton is ______________________________

a.  0.00000000000000000000000000167 kg
b. 0.00000000000000000000000000167 g
c.  1.67 x 0 27 kg
d. 16.7×10 26 kg

11. Which one of the following is dimensionally correct?

a. 5 Km = 5000 s
b. 5 Newton = 5 dynes
c. 10 joule = 50 kg
d.  None of these

12. The error in the measured quantity due to faulty apparatus is __________________________

a.  Random error
b. Environmental error
c.  Personal error
d. Systematic error

13. Which of the following is not the unit of length

a.  Angstrom
b. Micron
c.  Light year
d.  Fermi
e.  None

14. The percentage uncertainty in mass and velocity of a particle respectively are 2% and 4% respectively, the uncertainty in K.E will be _____________________

a. 20%

b. 10%
c. 30%
d. 40%

15.  The area of the newly constructed town measured approximately 5 km2, which is equivalent to ________________

a.  5 x 103 rn2
b. 5 x 106 m2
c. 5 x 104 m2

d. 5 x 10-6 m2

16.       The final uncertainty in the sum of Xl = 4.5 ±  0.1 cm and = 1.2 ± 0.1 cm is _____________________

a. 0.5 cm
b. 0.2 cm
c.  0.1 cm
d.  None

17.  The uncertainty recorded in the radius of a sphere is 6%. The uncertainty in the area of that sphere is _____________

a. 18%
b. 36%
c. 12%
d.  4%

18. The radius of a sphere is 2.5 cm. The uncertainty in volume of a sphere is _____________________

a. 4%
b. 8%
c. 12%
d. 16%

19.       The uncertainty recorded in the mass, speed of a body and radius of a curve are 2%, 1.3% and 4%. The uncertainty in the centripetal force

a. 7.3%
b. 3.3%
c.  8.6%
d.  5.3%

20. The time for 10 vibrations of simple pendulum recorded by stop watch is 17.5s± 0. The uncertainty in the final result is ______

a.  0.1 s
b. 0.006 s

c. 0.01 s
d. 0.002 s

21.  24000 people witnessed a 2nd on match between Pakistan and Australia day cricket. Melbourne cricket ground, the number significant figures in the counts are ____________________

a.  2
b. 3
c.  5
d.  6

22. The number x =3.4252 , rounded to two decimal place is _______________________

a. 3.43
b. 4.00
c. 3.42
d. 3.44

23. The sum (10.1+20.54+30.555) cm up to correct significant figures is _______________________

a.  61.195 cm
b. 62 cm
c.  61.2 cm
d.  None

24.  The area of a rectangle of length 1.2 cm and width 1.30 cm up to correct significant figures is ________________

a.  1.56 cm2
b. 1.6 cm2
c.  1.5 cm2
d.  1.60 cm2

25. The density of the air is 1.2 kg/m3. This density in CGS system is _______________________

a. 1.2 x10-3 g/cm3
b. 1.2 g/cm3
c.  2.3 g/cm3
d. 6.4 g/cm3

26. The dimensions of gravitational constant G are ___________________________

a.  [MLT21
b. [M3r21
c. [M l L3 T21
d. None

27.  The dimensions of torque are similar to the dimensions of ____________________

a. Force
b. Einstein’s energy mass equation
c.  Plank’s constant

d.  Angular momentum

28.  A student measured the speed of sound at 0 by using resonance tube. The values obtain on repetition were, 330m/s, 331m/s, 332m/ 333m/s, the measurements are ________________

a. More precise but less accurate
b. less precise and accurate
c.  more precise and more accurate
d.  less precise but more accurate

29.  The ratio of dimensions of inertial mass to gravitational mass is _____________________

a. 1 : 1

b. 1 : T-1
c. T-1 : 1

d. 1 : T-2

30.  A car is racing at 7200 km/h. The racing speed in Sl units will be ___________________

a. 2km/s
b. 2 m/s
c. 2000 km/s
d. 2000 m/s

31.  The percentage uncertainties in mass and spring constant in time period of spring mass system respectively are 2% and 6%. The percent uncertainty in its time period will be _____________________

a. 3%
b. 4%
c.  8%
d. none

32.  A solid angle made by 200 crn2 area of a cone of radius 10 cm at the cone edge will be ______________________

a.         2TT steradian
b.         2 steradian
c.         2Tr radian
d.         2 radian