NSC Physical Sciences Mechanics: Force and Newton’s Laws: Which ONE of the following combi

Question

Which ONE of the following combinations consists of only SCALAR quantities?
A. Velocity, speed and time
B. Time, distance and speed
C. Displacement, velocity and acceleration
D. Acceleration due to gravity on Earth is g.

Which ONE of the following represents the acceleration due to gravity on a planet that has TWICE the mass and HALF the radius of the Earth?
A. 3g
B. 4g
C. 6g
D. 8g

A ball is projected vertically upwards from the ground and reaches its maximum height after t s.
How will the ACCELERATION and TOTAL MECHANICAL ENERGY of the ball at its maximum height compare to that immediately after it was projected?
A. ACCELERATION
   Equal to
   Greater than
   Less than
   Equal to

B. TOTAL MECHANICAL ENERGY
   Equal to
   Greater than
   Less than
   Equal to

Can an object travel at CONSTANT VELOCITY along a horizontal road at a constant speed if it is accelerating in the form of the following motion?
Which ONE of the following statements about the power dissipated by the object is TRUE?
A. Increasing distance
B. Increasing kinetic energy
C. Decreasing power
D. Increasing power

Block X is placed on a horizontal table and is connected to block Y by a light inextensible string passing over a frictionless pulley, as shown below.
A constant frictional force acts on block X as it moves to the right.
P, Q and R are points on the table such that the distance from P to Q is equal to that from R to Q.

When block X reaches point Q, the string is cut and block X continues to move towards point R. Ignore the effects of air friction.
Consider the following statements:

(i) The work done by the frictional force acting on block X is greater when it moves from point P to point Q than when the block moves from point Q to point R.
(ii) The momentum and kinetic energy of block X decreases when the block moves from point Q to point R.
(iii) The total mechanical energy of block X remains constant when the block moves from point Q to point R.

Which of the above statements above is/are CORRECT as block X moves from point Q to point R?
A. (i) only
B. (ii) only
C. (i) and (ii) only
D. (ii) and (iii) only

Light emitted from a distant star contains a spectral line of frequency f. The star moves with a speed v that is observed on Earth as red-shifted.
Which ONE of the following combinations of the OBSERVED FREQUENCY of spectral line f and the MOTION OF THE STAR is CORRECT?
A. OBSERVED FREQUENCY
   Greater than f
   Smaller than f
   Equal to f
   MOTION OF THE STAR
   Away from Earth
   Towards Earth
   Away from Earth
   Towards Earth

A proton and an electron are a distance r apart. The magnitude of the electrostatic force exerted on either of the particles by the other is represented by F and is given by the equation:

Which graph illustrated correctly shows how this relationship between F and r is presented?
A.
B.
C.
D.

The emf ε of a battery is E and its internal resistance is r. The battery is connected to three resistors and four voltmeters, as shown below. The resistance of the conducting wires is negligible, while the voltmeters have very high resistances.

Which ONE of the following equations represents the reading on voltmeter V1 in terms of the readings on the other voltmeters?
A. V1 = V2 + V3 + V4
B. V1 = V2 + V3 + 2V4
C. V1 = V3 + V4 + 2V2
D. V1 = V4 + V2 + 2V3

An AC generator consists of a coil which is rotated in a magnetic field. The emf time graph for one complete rotation of the coil is shown below.
If the speed of rotation of the coil is now DOUBLED, which ONE of the following graphs is CORRECT for one complete rotation of the coil?
A.
B.
C.
D.

White light is passed through a cold gas and then through a prism, as shown below. An emission spectrum is observed on the screen.
Which ONE of the following correctly describes the ENERGY TRANSITION of the atoms of the gas and the TYPE OF LINE SPECTRUM observed on the screen?
A. Higher to lower energy level
   Emission
B. Lower to higher energy level
   Emission
C. Higher to lower energy level
   Absorption
D. Lower to higher energy level
   Absorption

Which ONE of the following combinations consists of only SCALAR quantities? A - NSC Physical Sciences - Question 1 - 2022 - Paper 1

Worked Solution & Example Answer:Which ONE of the following combinations consists of only SCALAR quantities? A - NSC Physical Sciences - Question 1 - 2022 - Paper 1

Which ONE of the following combinations consists of only SCALAR quantities?

Which ONE of the following represents the acceleration due to gravity on a planet that has TWICE the mass and HALF the radius of the Earth?

How will the ACCELERATION and TOTAL MECHANICAL ENERGY of the ball at its maximum height compare to that immediately after it was projected?

Can an object travel at CONSTANT VELOCITY along a horizontal road at a constant speed if it is accelerating in the form of the following motion?

Which ONE of the following statements about the power dissipated by the object is TRUE?

When block X reaches point Q, the string is cut and block X continues to move towards point R. Which of the above statements above is/are CORRECT as block X moves from point Q to point R?

Which ONE of the following combinations of the OBSERVED FREQUENCY of spectral line f and the MOTION OF THE STAR is CORRECT?

Which graph illustrated correctly shows how this relationship between F and r is presented?

Which ONE of the following equations represents the reading on voltmeter V1 in terms of the readings on the other voltmeters?

If the speed of rotation of the coil is now DOUBLED, which ONE of the following graphs is CORRECT for one complete rotation of the coil?

Which ONE of the following correctly describes the ENERGY TRANSITION of the atoms of the gas and the TYPE OF LINE SPECTRUM observed on the screen?

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