Physics part 1

Mass affects how fast an object falls. Question options: True False

FALSE Rationale: The rate at which an object falls does not depend on mass.

The _____ variable is the factor that is changed or manipulated; the dependent variable is the factor that depends on the independent variable. Question options: control independent hypothesis theory

INDEPENDENT Rationale: The dependent variable depends on the independent variable.

What is the volume of a cube whose side is 10 cm? Question options: 10^-3 m^3 , 10 m^3 , 10^2 m^3 , 10^3 m^3

10^-3 m^3 Rationale: Volume of a cube V = L3.

What is the number of significant digits in the measurement 34.000 m? Question options:2 3 4 5

5 Rationale: As per the common rules for counting significant figures: (i) All nonzero digits are significant. (ii) All zeros on the right of the last nonzero digit in the decimal part are significant.

To convert 1.3 hours to minutes, you would multiply by 1 h / 60 min. Question options: True False

FALSE Rationale: To convert 1.3 hours to minutes, you would multiply by 60 min / 1h.

The number of significant digits in the mass of a body measuring 4200.0 kg is 2. Question options:True False

FALSE Rationale: The number of significant digits in the mass of a body measuring 4200.0 kg is 5.

The following two formulas are equivalent: m = rise / run and m = δx / δy. Question options:True False

FALSE Rationale: When thinking about slope, δy is the rise and δx is the run.

A nanometer is a unit of mass, whereas a nanosecond is a unit of time. Question options:True False

FALSE Rationale:A nanometer is a unit of length. A nanosecond is a unit of time.

According to Aristotle, a rock falls faster in water (more dense) than air (less dense). Question options:True False

FALSE Rationale:According to Aristotle, a rock falls faster through air than through water.

The SI system uses three base units. Question options: True False

FALSE Rationale:The SI system uses seven base units.

Decide which of the following prefixes is the largest: centi-, milli-, deci-, or kilo-. Question options: centi - milli - deci - kilo-

KILO Rationale: The prefix kilo- means 1,000. milli is one-thousandth deci is one-tenth centi is one-hundreth

_____ is the degree of exactness of a measurement; _____ describes how well the results of a measurement agree with the "real" value. Question options: Accuracy precision , Precision accuracy Accuracy line of best fit Precision line of best fit

PRECISION AND ACCURACY Rationale:Precise measurements of the same value are close to each other. Accurate measurements of the same value are close to correct.

The time period T of a simple pendulum is given by the relation , where L is the length of the pendulum and g is the gravitational field at the place. From the above relation, we can say that: Question options: T ∝ g T ∝ L T2 ∝ g T2 ∝ L

T2 ∝ L Rationale:. On squaring both sides we get, . Therefore, T2 ∝ L.

Mass is the quantity of matter an object has. Question options: True False

TRUE Rationale: The quantity of matter an object has is called mass.

The valid digits in a measurement are called the significant digits. Question options:True False

TRUE Rationale: Significant digits are the valid digits from a measurement.

Kelvin is a unit of temperature, whereas ampere is a unit of current. Question options: True False

TRUE Rationale:Amperes measure current. Kelvins measure temperature.

All measurements are subject to some uncertainty. Question options:True False

TRUE No measurement is totally exact

A _____ is a rule of nature that sums up related observations to describe a pattern in nature. Question options: scientific theory scientific law hypothesis theory

scientific law Rationale: A scientific law describes how things work in nature without explaining why.

A _____ has been tested and supported many times whereas a _____ is an idea about how things might work. Question options: hypothesis scientific theory , scientific theory hypothesis , scientific law hypothesis , hypothesis scientific law

scientific theory hypothesis Rationale: A scientific theory is an explanation of a pattern of results. A hypothesis is a prediction.