Answer: Option A

Answer: Option C

Answer - Option D

Answer: Option C

Answer: Option C

Answer: Option A The real ray that enters into our eyes due to total internal reflection (TIR) from object D. For TIR to occur, i > c and the light is travelling from an optically denser medium (water) towards a less dense medium (air). But to locate the image, the key concept here is to look at the last real ray. Our eyes and brain assume that light travels in a straight line, so we will assume the virtual image of the object is straight further down, extended from the last

Answer: Option A

Answer: Option A

Answers Option C

Answer: Option D

Answer: Option C

Answer: Option A

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.

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).

Answer: Option C

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.

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.

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.

Answer: Option A

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