Paper 1 Conservation Laws in Physics Drills

Q1

A conservation law is most useful when applied to

A. a clearly defined system.
B. one object only always.
C. no boundaries.
D. only thermal systems.

Q2

Linear momentum is conserved during an interaction when the resultant external impulse on the system is

A. maximum.
B. zero or negligible.
C. equal to velocity.
D. unknown always.

Q3

Charge conservation at a circuit junction gives

A. voltage is always zero.
B. resistance adds directly.
C. sum of currents entering equals sum leaving.
D. energy is not conserved.

Q4

Energy conservation means energy is

A. always kinetic only.
B. lost from universe.
C. only electrical.
D. transferred or transformed, not created or destroyed.

Q5

In nuclear equations, nucleon number conservation checks

A. bottom numbers only.
B. top numbers.
C. electron shells.
D. half-life.

Q6

In nuclear equations, charge/proton number conservation checks

A. top numbers only.
B. mass in kg.
C. bottom numbers.
D. activity.

Q7

Mass-energy conservation in nuclear physics allows

A. rest mass decrease to appear as released energy.
B. charge disappearance.
C. momentum non-conservation.
D. nucleon number violation.

Q8

For a two-object explosion initially at rest, total final momentum is

A. positive always.
B. negative always.
C. equal to total kinetic energy.
D. zero.

Q9

In an inelastic collision, momentum may be conserved while kinetic energy is

A. not conserved.
B. always conserved.
C. created from nothing.
D. zero before and after.

Q10

Kirchhoff first law is an expression of conservation of

A. energy.
B. charge.
C. mass-energy.
D. nucleon number.

Q11

Kirchhoff second law is an expression of conservation of

A. charge.
B. nucleon number.
C. energy.
D. momentum.

Q12

A common error in conservation questions is

A. mixing system and surroundings.
B. drawing diagrams.
C. using SI units.
D. checking signs.

Q13

Momentum is a

A. scalar.
B. vector.
C. unitless count.
D. form of charge.

Q14

Energy is a

A. vector.
B. direction field.
C. nuclear charge only.
D. scalar.

Q15

For vertical motion with air resistance, mechanical energy of the object-Earth system is

A. not conserved if thermal transfer to surroundings is outside the system.
B. always conserved as kinetic plus gravitational potential only.
C. zero.
D. equal to charge.

Q16

For a closed isolated system, total charge is

A. increasing always.
B. constant.
C. decreasing always.
D. undefined.

Q17

Conservation of nucleon number in beta-minus decay is possible because

A. neutron changes to proton without changing total nucleon count.
B. a helium nucleus is emitted.
C. gamma changes mass number.
D. electron number is top number.

Q18

In a circuit loop, lost volts and gained emf are balanced by

A. momentum conservation.
B. nuclear binding.
C. energy conservation per unit charge.
D. diffraction.

Q19

The first step in using a conservation law should be to

A. define the system and check conditions.
B. write every formula memorised.
C. ignore signs.
D. assume all quantities are conserved.

Q20

A conserved quantity may still be transferred

A. only out of existence.
B. without accounting.
C. only in nuclear reactions.
D. between parts of the chosen system.