Which observation includes numbers and measurements?
a
Qualitative
b
Experimental
c
Quantitative
d
Natural
3
"Water keeps its level" is an example of:
a
Quantitative observation
b
Qualitative observation
c
Estimation
d
Measurement
4
Time for one heartbeat is approximately:
a
10⁻³ s
b
10⁰ s
c
10² s
d
10⁻¹ s
5
The diameter of the Earth is approximately:
a
10⁹ m
b
10⁷ m
c
10¹² m
d
10⁴ m
6
The mass of the Earth is about:
a
10¹⁰ kg
b
10²⁵ kg
c
10³⁰ kg
d
10⁻¹⁵ kg
7
One year is approximately:
a
10⁵ s
b
10⁷ s
c
10⁹ s
d
10¹¹ s
8
The mean diameter of a wire is found to be 0.50±0.02mm. Calculate the percentage uncertainty in the diameter:
a
2%
b
4%
c
6%
d
8%
9
A reaction takes place that is expected to yield 171.9g of product, but it only yields 154.8g. What is the percent error for this experiment?
a
17.1%
b
90.1%
c
111.0%
d
9.9%
10
Three different people weigh a standard mass of 2.00g on the same balance. Each person obtains a reading of exactly 7.32 g for the mass of the standard. These results imply that the balance that was used is:
a
Both accurate and precise
b
Neither accurate nor precise
c
Accurate but not precise
d
Precise but not accurate
11
Dimension of universal gravitational constant is:
a
b
c
d
12
A measurement which on repetition gives same or nearly same result is called:
a
Accurate
b
Average
c
Precise
d
Estimated
13
A student is measuring the time of an event by using stopwatch. He takes 5 measurements as: 3.0s, 3.2s, 3.4s, 2.8s, 3.1s. What is the uncertainty in the results?
a
±0.3 s
b
±0.6 s
c
±7.75 s
d
±3.1 s
14
Which quantity has different dimension?
a
Force
b
Weight
c
Modulus of elasticity
d
Tension
15
If the dimension of a physical quantity are given by [Lᵃ Mᵇ Tᶜ], then the physical quantity will be:
a
Force, if a = -1, b = 0, c = -2
b
Pressure, if a = -1, b = 1, c = -2
c
Velocity, if a = 1, b = 0, c = 1
d
Acceleration, if a = 1, b = 1, c = -2
16
Order of magnitude of (10⁶+10³) is:
a
10¹⁸
b
10⁹
c
10⁶
d
10³
17
Which of the following may be used as a valid formula to calculate speed of ocean waves? [v = speed, g = acceleration due to gravity λ = wavelength, ρ = density, h = depth]:
a
b
v = ρgh
c
d
v = λgh
18
Physics is a quantitative science based primarily on:
a
Fundamental quantities
b
Definition
c
Experiment and measurement
d
Description of facts
19
A physical quantity has the symbol V and the unit m³. Which physical quantity does the V represent?
a
Potential difference
b
Velocity
c
Pressure
d
Volume
20
A physical quantity has the unit ms⁻² and the symbol a. what is the correct name for this quantity?
