Free Force and Motion MCQs with Answers
1,416 Force and Motion MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
Last updated
1,416 questions · page 4 of 71
- A. 3
- B. 5
- C. 2
- D. None
Explanation: In 5.400, the two zeros after the decimal point are significant because they show measured precision, so the number has 4 significant…
Correct answer: None- A. Percentage uncertainties are added
- B. Absolute uncertainties are added
- C. Percentage uncertainties are divided
- D. Absolute uncertainties are divided
Explanation: For multiplication or division, fractional uncertainties combine, so percentage uncertainties are added.
Correct answer: Percentage uncertainties are added- A. Random error
- B. Personal error
- C. Systematic error
- D. Classified error
Explanation: Zero error produces a consistent offset in every reading, so it is a systematic error rather than a random fluctuation.
Correct answer: Systematic error- A. f=vt
- B. S=Vit+1/2at2
- C. V=St
- D. V=f/t
Explanation: In S = Vit + 1/2at², Vit has dimensions (m s-1)(s) = m and at² has dimensions (m s-2)(s²) = m, so every term has the dimension of…
Correct answer: S=Vit+1/2at2- A. Newton/Meter2
- B. newton/meter2
- C. Newton/meter2
- D. newton/Meter2
Explanation: Pressure is force divided by area, so its SI unit is newton per square metre, written in words as newton/meter2 or more formally as N/m².
Correct answer: newton/meter2- A. Newton, n
- B. Newton, N
- C. newton, n
- D. newton, N
Explanation: The SI unit name is written as newton in lowercase, while its symbol is N in uppercase because it is named after a person.
Correct answer: newton, N- A. 10 raised to power -15
- B. 10 raised to power -12
- C. 10 raised to power -9
- D. 10 raised to power -6
Explanation: The SI prefix pico represents one trillionth, so pico = 10^-12. Thus 1 ps, for example, is 10^-12 s.
Correct answer: 10 raised to power -12- A. Giga
- B. Beta
- C. Mega
- D. Deca
Explanation: Among the valid prefixes listed, giga is the largest: giga = 10^9, mega = 10^6, and deca = 10^1. Beta is not an SI prefix.
Correct answer: Giga- A. Sum of their absolute uncertainties
- B. The difference of their absolute uncertainties
- C. The product of their absolute uncertainties
- D. Division of their absolute uncertainties
Explanation: For subtraction, the maximum absolute uncertainty is found by adding the absolute uncertainties: if z = x - y, then Δz = Δx + Δy.
Correct answer: Sum of their absolute uncertainties- A. Accessible
- B. Invariable
- C. Transportable
- D. Only a and b are correct
Explanation: An ideal standard should be accessible and invariable, so its value can be obtained conveniently and does not change with time or…
Correct answer: Only a and b are correct- A. Only (i)
- B. Only (ii)
- C. Only (iii)
- D. Both (i) and (ii)
Explanation: A metre rod normally has a least count of 1 mm = 0.001 m, so a reading should be recorded to the nearest 0.001 m.
Correct answer: Only (iii)- A. Accurate
- B. Precise
- C. Accurate and precise
- D. None of these
Explanation: A smaller least count lets an instrument resolve smaller changes, so it gives greater precision.
Correct answer: Precise- A. 3
- B. 4
- C. 5
- D. 2
Explanation: In 0.0173, the zeros before 1 are leading zeros and are not significant; the digits 1, 7 and 3 are significant.
Correct answer: 3- A. May be significant may not significant
- B. Always significant
- C. Always insignificant sign
- D. Significant only if left to a significant figure
Explanation: A zero may be significant or insignificant depending on its position: zeros between nonzero digits are significant, while leading zeros…
Correct answer: May be significant may not significant- A. All accurately known and all doubtful digits
- B. Only accurately known digits
- C. Only doubtful digits
- D. All accurately known digits and the first doubtful digit
Explanation: A measurement contains all digits known with certainty plus one final digit that is estimated or doubtful.
Correct answer: All accurately known digits and the first doubtful digit- A. Taking zero correction
- B. Comparing the instrument with another more accurate one
- C. Taking mean of several measurements
- D. All methods explained in A, B and C
Explanation: Random errors vary unpredictably from one reading to another, so averaging several readings tends to cancel positive and negative…
Correct answer: Taking mean of several measurements- A. Limitation of an instrument
- B. Natural variation of the object to be measured
- C. Inadequate technique
- D. All given in A, B and C
Explanation: Uncertainty can result from the instrument’s finite resolution, natural changes in the measured object, or an imperfect measurement…
Correct answer: All given in A, B and C- A. The inexperience of a person
- B. The faulty apprentice
- C. Inappropriate method
- D. Due to all reasons in A, B and C
Explanation: Inexperience, faulty apparatus, and an inappropriate method can all produce a difference between a measured value and the accepted value.
Correct answer: Due to all reasons in A, B and C- A. 10 Raised to power 1
- B. 10 Raised to power 2
- C. 10 Raised to power 3
- D. 10 Raised to power -1
Explanation: The SI prefix deca means a factor of 10, written as 10^1. Students may choose b because kilo is the familiar larger prefix and represents…
Correct answer: 10 Raised to power 1- A. 1.024 x 10^3
- B. 2 Raised to power 10
- C. 0.000976
- D. 1/0.00097
Explanation: Scientific notation requires one nonzero digit before the decimal point, so 1024 = 1.024 × 10^3.
Correct answer: 1.024 x 10^3