P1 | SG Physics

What conditions will make the bulb brighter? (Pure)

Answer: Option A

Evan Toh

5 days ago1 min read

What is the work done by the worker? Work done on the block? Express W in terms of P

Answer: Option A

Evan Toh

5 days ago1 min read

What is the background radiation count rate?

Answers Option C

Evan Toh

5 days ago1 min read

Mirror tilted 10o, what is the angle between the incident ray and the reflected ray?

Answer: Option D

Evan Toh

5 days ago1 min read

Which displacement-time graph shows the particle X?

Answer: Option C

Evan Toh

5 days ago1 min read

What is the current flowing through the device?

Answer: Option A

Evan Toh

Aug 21 min read

What is the direction of the current flow in through the wire?

Answer: Option D We can use Fleming’s Left Hand Rule to determine the direction of the force on the current carrying wire. The real reason is due to the combined magnetic fields of the current carrying wire and magnets (as shown in the diagram). The resultant magnetic field creates an uneven magnetic field around the wire. The direction of the force on the wire is in the direction from strong magnetic field towards the weak magnetic field region.

Evan Toh

Aug 21 min read

Two parallel current-carrying wires with current in the same direction.

Answer: Option D Think of the lovers analogy. When both currents are in the same direction, it’s like couple in love, so attraction. Likewise, when the currents are in opposite direction, they quarrel, hence repulsion. On the magnitude of the force, always remember for electric force, magnetic force or gravitational force between objects, the forces are equal and opposite, action-reaction pair (Newton’s 3rd Law).

Evan Toh

Aug 21 min read

What is the barometer reading when aeroplane is flying at 12 km above sea level? (Pure Physics)

Answer: Option C

Evan Toh

Aug 21 min read

What is the acceleration just before and after the ball hits the floor?

Answer: Option D Under free-fall, where there is no air resistance, when you release the ball or throw a ball up, the moment the ball leaves your hand, the only force acting on the ball is its weight and the acceleration is a constant 10 m/s^2 and is downwards, towards the centre of the Earth.

Evan Toh

Aug 21 min read

What is the heat capacity of the beaker? (Pure Physics)

Answer: Option A Heat capacity (C) is the thermal energy transferred to increase the temperature of the substance by 1 oC or 1 K. Specific heat capacity (c) is the thermal energy transferred to increase the temperature of 1 kg of substance by 1 oC or 1 K. The relationship is C = mc i.e. the mass of the beaker is not given as the heat capacity already has taken into account the mass.

Evan Toh

Aug 21 min read

What is the average force acting on the dart? Using COE and Kinematics to solve.

Answer: Option B This question can be solved using both Conservation of Energy and Kinematics. Indeed, using COE to solve will be much simpler and straight forward. But do know both methods.

Evan Toh

Aug 21 min read

Car at constant speed, which shows the work done by the engine and power of the engine?

Answer: Option A

Evan Toh

Jul 141 min read

Converging lens - Which shows the image formed correctly?

Answer: Option A View the explanation Click here to view the basic concepts of converging lens https://www.sgphysicstuition.com/post/converging-lens-overview

Evan Toh

May 211 min read