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Science MCQs

Practice multiple choice questions with instant feedback. Select an option to see if you're correct.

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2100
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Question 1991 Medium

How does the mass of a star influence its lifespan?

A
Mass does not affect lifespan
B
Low-mass stars have shorter lives
C
All stars live the same time
D
High-mass stars have shorter lives
Question 1992 Hard

What is the key difference between a constellation and a galaxy?

A
They are the same thing
B
A constellation is larger than a galaxy
C
A constellation is a pattern as seen from Earth a galaxy is a physical system
D
A galaxy is a pattern a constellation is a physical system
Question 1993 Hard

What critical event allows a protostar to become a main-sequence star?

A
It leaves its nebula
B
It cools down significantly
C
It collides with another star
D
The onset of nuclear fusion in its core
Question 1994 Hard

What prevents light from escaping a black hole?

A
It is too dark
B
Extremely strong gravity
C
There is no light inside
D
Light is absorbed by dust
Question 1995 Hard

Why are low-mass stars more common than high-mass stars in the universe?

A
They are easier to see
B
They are brighter
C
They live longer
D
The process of star formation favors lower masses
Question 1996 Hard

What does the Hubble expansion observation imply about the past universe?

A
It did not exist
B
It was colder and emptier
C
It was the same size as now
D
It was hotter and denser
Question 1997 Hard

What is the primary function of the objective lens in a simple telescope?

A
To gather light from a distant object
B
To support the eyepiece
C
To magnify the image
D
To correct color distortion
Question 1998 Hard

What is the primary function of the eyepiece lens in a simple telescope?

A
To invert the image
B
To magnify the image formed by the objective
C
To filter harmful radiation
D
To gather light
Question 1999 Hard

What is a safe method for observing the Sun?

A
Looking directly with sunglasses
B
Using binoculars with a dark filter
C
Projecting its image through a pinhole
D
Using a telescope without a filter
Question 2000 Hard

What is the ultimate fate of a white dwarf?

A
It cools to become a black dwarf
B
It explodes as a supernova
C
It expands into a red giant
D
It collapses into a black hole
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