A metal sphere is placed on an insulating stand. A negatively charged rod is brought close to it. If the sphere is earthed and the rod is taken away, what will be the charge on the sphere?
- A. The sphere will remain neutral.
- B. The sphere will have a net negative charge.
- C. The sphere will have a net positive charge.
- D. The sphere will become polarized
The pitch of a musical note is determined by the frequency of the sound wave that it produces. If two instruments have the same frequency, which of the following factors will most affect the difference in their pitches?
- A. The shape of the instrument
- B. The tension of the string
- C. The size of the instrument
- D. The material of the instrument
In an AC circuit, resonance occurs when the impedance of the circuit is:
- A. Zero
- B. Maximum
- C. Equal to the capacitive reactance of the circuit
- D. Minimum
Which of the following is a type of wave that is both mechanical and longitudinal?
- A. Water waves
- B. Seismic waves
- C. Sound waves
- D. Light waves
Which of the following types of electromagnetic waves is used in night vision goggles?
- A. Microwaves
- B. Ultraviolet waves
- C. Infrared waves
- D. Radio waves
In the diagram above, if the south poles of two magnets stroke a steel bar, the polarities at X and Y will respectively be
- A. south and north
- B. north and south
- C. north and north
- D. south and south
Which of the following statements is correct about the angle of dip at various points on Earth?
- A. The angle of dip is zero at the equator and 90 degrees at the magnetic poles.
- B. The angle of dip is greater at higher altitudes than at lower altitudes
- C. The angle of dip is positive in the northern hemisphere and negative in the southern hemisphere.
- D. The angle of dip is constant at all points on Earth
When a water droplet is placed on a freshly cut piece of wood, it spreads out to form a thin layer because the wood is
- A. not at equilibrium with the water
- B. cohesive to water
- C. at equilibrium with the water
- D. adhesive to water
A positively charged particle is placed near a negatively charged particle. What is the direction of the electric force between the two particles?
- A. The electric force is directed from the negative particle to the positive particle.
- B. The electric force is zero.
- C. The direction of the electric force cannot be determined.
- D. The electric force is directed from the positive particle to the negative particle.
Which of the following is an example of a couple?
- A. All of the above.
- B. The forces that are applied to the handle of a screwdriver when you twist it.
- C. The forces that are applied to a cross wench to loosen or tighten the lug nuts on a wheel of a car.
- D. The forces that are applied to the steering wheel of a car when you turn it.
Which of the following is NOT an example of elementary modern physics?
- A. Classical mechanics
- B. Quantum mechanics
- C. Special relativity
- D. Nuclear physics
A generator manufacturing company accidentally made an AC generator instead of a DC generator. To fix this error,
- A. the magnetic field needs to be made stronger
- B. the split rings should be replaced with slip rings
- C. the number of turns of the armature coil needs to be decreased
- D. the slip rings should be replaced with split rings
Which of the following materials is a good insulator?
- A. Silver
- B. Water
- C. Rubber
- D. Copper
The electrolyte used in the Nickel-Iron (NiFe) accumulator is
- A. dilute tetraoxosulphate(VI) acid
- B. barium chloride solution
- C. potassium hydroxide solution
- D. sodium hydroxide solution
What is the name of the model of the atom that describes electrons as orbiting the nucleus in specific energy levels?
- A. Bohr model
- B. Dalton model
- C. Rutherford model
- D. Thomson model
Which of the following liquids has the highest surface tension?
- A. Soapy water
- B. Water
- C. Mercury
- D. Oil
Which of the following is NOT a limitation of experimental measurements?
- A. Systematic error
- B. Instrument resolution
- C. Random errors
- D. Human error
When light of a certain frequency is incident on a metal surface, no photoelectrons are emitted. If the frequency of the light is increased, what happens to the stopping potential?
- A. The stopping potential does not change.
- B. The stopping potential decreases.
- C. The stopping potential can either increase or decrease, depending on the intensity of the light.
- D. The stopping potential increases.
From the diagram above, if the potential difference across the resistor, capacitor and inductor are 60V, 120V and 30V respectively, the effective potential difference is
- A. 81
- B. 67
- C. 59
- D. 73
Which of the following is a type of incandescent light source?
- A. Fluorescent lamp
- B. LED lamp
- C. Tungsten filament lamp
- D. Neon lamp
The working of the beam balance is based on the principle of
- A. moments
- B. conservation of energy
- C. equivalence
- D. floatation