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When a dielectric is placed in an electric field, the field inside the dielectric:
A. Is weaker than the external field
B. Is stronger than the external field
C. Remains the same
D. Becomes zero
Answer: Is weaker than the external field
Subjects: Electrostatics, Physics
A lens with a focal length of -10 cm is a:
The number of complete oscillations that occur per second is known as the wave’s:
A. Frequency
B. Wavelength
C. Amplitude
D. Period
Answer: Frequency
Subjects: Oscillations and Waves, Physics
The amount of time it takes for a wave to travel one wavelength is known as its:
A. Period
B. Frequency
C. Wavelength
D. Amplitude
Answer: Period
Subjects: Oscillations and Waves, Physics
What is the principle behind a heat engine?
A. Converting heat energy into mechanical work
B. Transferring heat from cold to hot reservoirs
C. Maintaining constant temperature
D. Preventing heat flow
Answer: Converting heat energy into mechanical work
Subjects: Thermal Physics, Physics
The property that describes a material’s ability to absorb impact energy is called:
A. Impact strength
B. Hardness
C. Toughness
D. Ductility
Answer: Impact strength
Subjects: Properties of Bulk Matter, Physics
The escape velocity from a celestial body depends on:
A. The mass and radius of the body
B. The body's density and temperature
C. The body's temperature and pressure
D. The body's mass and surface area
Answer: The mass and radius of the body
Subjects: Gravitation, Physics
The momentum of an object is calculated by multiplying its:
A. Mass and velocity
B. Mass and acceleration
C. Force and time
D. Energy and velocity
Answer: Mass and velocity
Subjects: Linear Momentum and Collisions, Physics
When two objects collide elastically, the total momentum and total kinetic energy:
A. Are both conserved
B. Are both not conserved
C. Only momentum is conserved
D. Only kinetic energy is conserved
Answer: Are both conserved
Subjects: Linear Momentum and Collisions, Physics