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Unit 1: Physics And Measurements
Physics I
For HSC Part 1 / XI / Class 11 (Science Group)
SECTION A
Multiple Choice Questions (MCQs)
Choose the correct answer:1. The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1x10-3 are:
a) 5, 1, 2 ✔
b) 5, 1, 5
c) 5,5,2
d) 4, 4,2
2. Which among the following is the supplementary unit:
a) Mass
b) Time
c) Solid angle ✔
d) Luminosity
3. The unit of solid angle is:
a) Second
b) Steradian ✔
c) Kilogram
d) Candela
4. The quantity having the same unit in all system of unit is:
a) mass
b) time ✔
c) length
d) temperature
5. Random errors can be eliminated by:
a) taking number of observations and their mean.
b) measuring the quantity with more than one instrument
c) eliminating the cause ✔
d) careful observations
6. Systemic error can be:
a) either positive or negative ✔
b) negative only
c) positive only
d) zero error
7. [MLT-2] is dimensional formula of:
a) strain
b) force ✔
c) displacement
d) pressure
8. Which of the following pair has the same dimension?
a) moment of inertia and torque
b) surface tension and force
c) impulse and momentum ✔
d) specific heat and latent heat
9. Dependent variable is:
a) cause
b) effect
c) cause and effect ✔
d) reason
10. Dimensions of kinetic energy is the same as that of:
a) Acceleration
b) Velocity
c) Work ✔
d) Force
Fill In The Blamks
1. Pride of Pakistan, World's second highest peak, K-2, summit of 8611 meters.2. Physics is a branch of science which studies the nature and behavior of matter, energy, and the interaction between them.
3. A derived quantity is defined based on a combination of base quantities and has a derived unit that is the exponent, product or quotient of these base units.
4. The ticker timer is simply a piece of apparatus that we use to measure time.
5. The standard units of electrical measurement used for the expression of voltage is the Volt [V].
6. The standard units of electrical measurement used for the expression of current and resistance is the Ampere [A).
7. The standard units of electrical measurement used for the expression of resistance is Ohm ().
8. The way in which the derived quantity is related to the basic quantity can be shown by the dimensions of the quantity.
9. Any experiment will have a number of measurements, and which will be made to a certain degree of accuracy.
10. Systematic errors happen because of faulty apparatus.
11. Incorrectly labelled scale, an incorrect zero mark on a meter or a stop watch running slowly are systematic errors.
12. Random errors depends upon how well the experimenter can use the apparatus.
13. Graphs are visuals that show relationships between variable.
14. Graphs are intended to display the data in a way that is easy to understand and remember.
15. Graphs are used to demonstrate trends, patterns and relationships between sets of data.
16. Independent Variable is the cause.
17. Value of independent Variable is independent of other variables in our study.
18. Dependent Variable is the effect.
19. Value of dependent Variable depends on changes in the independent variable. 20. The significant figures refer to the number of important single digit (0 through 9 inclusive) in the coefficient of an expression in scientific notation.
21. Accuracy is the degree to which the result of a measurement conforms to the correct value or a standard' and essentially refers to how close a measurement is to its agreed value.
22. Precision is the quality of being exact' and refers to how close two or more measurements are to each other, regardless of whether those measurements are accurate Or not.
23. Resolution is the ability of the measurement system to detect and faithfully indicate small changes in the characteristic of the measurement result.
Key Formulas
Concept Map
