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Free download in PDF Class 11 Physics Chapter 2 Units And Measurements Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
(1)
The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give
[A]
2.75 and 2.74
[B]
2.74 and 2.73
[C]
2.75 and 2.73
[D]
2.74 and 2.74
(2)
The length and breadth of a rectangular sheet are 16.2 cm and 10.1cm, respectively. The area of the sheet in appropriate significant figures and error is
[A]
164 ± 3 cm2
[B]
163.62 ± 2.6 cm2
[C]
163.6 ± 2.6 cm2
[D]
163.62 ± 3 cm2
(3)
Which of the following pairs of physical quantities does not have same dimensional formula?
[A]
Work and torque.
[B]
Angular momentum and Planck’s constant.
[C]
Tension and surface tension.
[D]
Impulse and linear momentum.
Answer: Tension and surface tension.
(4)
Measure of two quantities along with the precision of respective measuring instrument is
A = 2.5 m s-1 ± 0.5 ms-1 B = 0.10 s ± 0.01 s
The value of A B will be
[A]
(0.25 ± 0.08) m
[B]
(0.25 ± 0.5) m
[C]
(0.25 ± 0.05) m
[D]
(0.25 ± 0.135) m
(5)
You measure two quantities as A = 1.0 m ± 0.2 m, B = 2.0 m ± 0.2 m. We should report correct value for √AB as:
[A]
1.4 m ± 0.4 m
[B]
1.41m ± 0.15 m
[C]
1.4m ± 0.3 m
[D]
1.4m ± 0.2 m
(6)
Which of the following measurements is most precise?
[A]
5.00 mm
[B]
5.00 cm
[C]
5.00 m
[D]
5.00 km.
(7)
The mean length of an object is 5 cm. Which of the following measurements is most accurate?
[A]
4.9 cm
[B]
4.805 cm
[C]
5.25 cm
[D]
5.4 cm
(8)
Young’s modulus of steel is 1.9 × 1011 N/m2. When expr essed in CGS units of dynes/cm2, it will be equal to (1N = 105 dyne, 1m2 = 104 cm2)
[A]
1.9 × 1010
[B]
1.9 × 1011
[C]
1.9 × 1012
[D]
1.9 × 1013
(9)
If momentum (P ), area (A) and time ( T ) are taken to be fundamental quantities, then energy has the dimensional formula
[A]
(P1 A-1 T1)
[B]
(P2 A1 T1)
[C]
(P2 A-1/2 T1)
[D]
(P1 A1/2 T-1)
(10)
Which of the following are not a unit of time?
[A]
Second
[B]
Parsec
[C]
Year
[D]
Light year
(11)
Which of the following ratios express pressure?
[A]
Force/ Area
[B]
Energy/ Volume
[C]
Energy/ Area
[D]
Force/ Volume
(12)
If Planck’s constant (h ) and speed of light in vacuum (c ) are taken as two fundamental quantities, which one of the following can, in addition, be taken to express length, mass and time in terms of the three chosen fundamental quantities?
[A]
Mass of electron (me)
[B]
Universal gravitational constant (G)
[C]
Charge of electron (e)
[D]
Mass of proton (mp)
(13)
Photon is quantum of radiation with energy E = hν where ν is frequency and h is Planck’s constant. The dimensions of h are the same as that of
[A]
Linear impulse
[B]
Angular impulse
[C]
Linear momentum
[D]
Angular momentum
(14)
If P, Q, R are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity?
[A]
(P – Q)/R
[B]
PQ – R
[C]
(PR – Q2)/R
[D]
(R + Q)/P
(15)
Which is the most accurate atomic clock?
[A]
Carbon-12 clock
[B]
Carbon atom clock
[C]
Caesium atom clock
[D]
Stop clock
Answer: Caesium atom clock
(16)
The product of energy and time is called action. The dimensional formula for action is same as that for
[A]
Power
[B]
Angular energy
[C]
Force × velocity
[D]
Impulse × distance
Answer: Impulse × distance
(17)
After decimal point, number is less than 5 which is to be neglected,then retained number
[A]
gets increased
[B]
get decreased
[C]
remains unchanged
[D]
may decreased
Answer: remains unchanged
(18)
Which pair of following quantities has dimensions different from each other
[A]
Impulse and linear momentum
[B]
Plank's constant and angular momentum
[C]
Moment of inertia and moment of force
[D]
Young's modulus and pressure
Answer: Moment of inertia and moment of force
(19)
Planck's constant has the dimensions of :
[A]
force
[B]
energy
[C]
linear momentum
[D]
angular momentum
(20)
A dimensionless quantity
[A]
has no unit
[B]
must have a unit
[C]
cannot exist
[D]
May have a unit
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