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841.

Which type of mirror is commonly used in makeup mirrors to provide a magnified and upright image?

Concave mirror

Spherical mirror

Plane mirror

Convex mirror

Explanation Comments

Answer: Convex mirror

Explanation:

Convex mirrors are commonly used in makeup mirrors to provide a magnified and upright image.

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842.

What is the phenomenon where light waves change direction as they encounter a barrier or aperture and form a pattern of bright and dark bands?

Dispersion

Diffraction

Reflection

Interference

Explanation Comments

Answer: Diffraction

Explanation:

Diffraction is the phenomenon where light waves change direction as they encounter a barrier or aperture and form a pattern of bright and dark bands.

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843.

Which of the following statements is true regarding a body in translational equilibrium?

The body is moving with constant velocity.

The body has zero mass.

The net force acting on the body is zero.

The body is at rest.

Explanation Comments

Answer: The net force acting on the body is zero.

Explanation:

A body in translational equilibrium has no net force acting on it, which means the vector sum of all forces is zero.

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844.

Which of the following quantities is a scalar?

Force

Acceleration

Momentum

Velocity

Explanation Comments

Answer: Velocity

Explanation:

Velocity is a scalar quantity when it only includes magnitude (speed) and no direction, while force, acceleration, and momentum are vector quantities with direction.

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845.

What is the term for a thermodynamic process in which heat is neither added to nor removed from the system?

Adiabatic process

Isobaric process

Isochoric process

Isothermal process

Explanation Comments

Answer: Adiabatic process

Explanation:

An adiabatic process is one in which there is no heat transfer into or out of the system.

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846.

Which of the following materials is typically used as a conductor of electricity due to its high electrical conductivity?

Rubber

Glass

Wood

Copper

Explanation Comments

Answer: Copper

Explanation:

Copper is commonly used as a conductor of electricity due to its high electrical conductivity.

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847.

What is the SI unit of magnetic flux density?

Gauss (G)

Weber (Wb)

Tesla (T)

Ampere (A)

Explanation Comments

Answer: Tesla (T)

Explanation:

The SI unit of magnetic flux density is the Tesla (T).

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848.

What type of lens is used in a magnifying glass to create a virtual and magnified image of an object?

Convex lens

Concave lens

Plano-concave lens

Plano-convex lens

Explanation Comments

Answer: Convex lens

Explanation:

A convex lens is commonly used in a magnifying glass to create a virtual and magnified image of an object.

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849.

What is the phenomenon where light waves combine to create regions of increased intensity and regions of decreased intensity?

Reflection

Dispersion

Interference

Diffraction

Explanation Comments

Answer: Interference

Explanation:

Interference is the phenomenon where light waves combine to create regions of increased intensity (constructive interference) and regions of decreased intensity (destructive interference).

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850.