Free Printable Grand Final STEM Challenge 2021 for Physics

1.

Which of the following has the strongest gravitational pull?

a)

A bowling ball

b)

A car

c)

The Earth

d)

The Planet Mars

e)

The Sun

2.

What do we call the force of Earth's gravity on an object?

a)

Mass

b)

Speed

c)

Acceleration

d)

Weight

e)

Energy

3.

Choose the TRUE statement.

a)

The more mass an object has, the faster it will fall

b)

We weight more on the Moon than on Earth

c)

We weight less on a flying airplane than on Earth's surface

d)

Planet Jupiter has the strongest gravitational pull in the Solar system

4.

Which natural phenomenon occurs due to the gravitational pull of the Moon?

a)

Earthquakes

b)

Hurricanes

c)

Volcanic eruptions

d)

Ocean tides

e)

All of the above

5.

Where would you weight the most?

a)

Mars

b)

Earth

c)

Pluto

d)

The Sun

e)

I would weight the same everywhere

6.

Which of the following is the unit for gravitational force?

a)

$kg\ m^2\ s^{-2}$

b)

$N\ m^{-1}$

c)

$kg\ m\ s^{-2}$

d)

$kg^2\ m^{-2}$

e)

$N\ m\ s^{-1}$

7.

The weakest fundamental force of nature is known as

a)

Weak nuclear force

b)

Gravity

c)

Electromagnetic force

d)

Centrifugal force

e)

Van der Waals force

8.

Ali's mass is 40 kg on Earth. How much will Ali weight on a planet with 4 times the mass and 3 times the radius of Earth?

a)

53.3 kg

b)

174 N

c)

17.8 kg

d)

53.3 N

e)

174 kg

9.

Choose the WRONG statement.

a)

Below the Earth's surface, the closer I get to the Earth's center, the smaller the acceleration due to gravity I would experience.

b)

Heavier objects would acceleration towards the Earth at the same rate as lighter objects.

c)

The gravitational acceleration at the equator is higher than that at the poles.

d)

Satellites farther away from the Earth would have smaller gravitational acceleration.

10.

$-\frac{GMm}{2r}$

The above formula describes

a)

Gravitational Potential of the Moon due to Earth.

b)

Gravitational Potential Energy of an object on Earth.

c)

Total energy of a satellite moving in a circular orbit.

d)

Escape velocity of a rocket to be launched into space.

e)

Force experienced by an object in a planet with 2 times the Earth's radius.

11.

The unit for the universal gravitational constant is

a)

$m^2\ kg\ s^{-2}$

b)

$m^2\ kg^{-1}\ s^{-2}$

c)

$N\ kg^2\ m^2$

d)

$J\ m\ kg^{-1}$

e)

$J\ m\ kg^{-2}$

12.

A sateliite goes round the Earth in a circular orbit with radius $r$ and period $T$ . Which of the following shows the correct relation between $T$ and $r$ ?

a)

$T\propto r^2$

b)

$T\propto r^{\frac{1}{2}}$

c)

$T\propto r^{\frac{3}{2}}$

d)

$T^3\propto r^2$

13.

The air molecules in the Earth atmosphere do not escape from the Earth's surface because their speeds do not exceed

a)

$\sqrt{MgR}$

b)

$\sqrt{2gR}$

c)

$gR^2$

d)

$MgR$

14.

A satellite in a circular orbit of radius $r_1$ has period $T_1$ . Another satellite in another orbit of radius $2r_1$ has period $T_2$ . The ratio of $\frac{T_2}{T_1}$ is

a)

2.80

b)

0.31

c)

3.20

d)

3.40

e)

0.36

15.

A spacecraft going round the Earth in a circular orbit. Objects released from rest in the spacecraft remain stationary. The following statements are true except

a)

The objects are in a region where the resultant gravitational field is zero.

b)

The objects are falling freely towards the center of the Earth.

c)

All of the gravitational force is used to provide the centripetal force for circular motion.

d)

The objects are in a state of weightlessness.

16.

$\sqrt{\frac{2GM}{R}}$
The above formula describes

a)

The minimum energy need to escape from the gravitational pull of the Earth.

b)

The potential energy of a satellite orbiting the Earth.

c)

The minimum speed need to escape from the gravitational pull of the Earth.

d)

The total energy of a satellite orbiting the Earth.

e)

The period of a satellite orbiting the Earth.

17.

If $g$ is Earth's gravitational acceleration and $R$ is the Earth's radius, the density of the Earth is

a)

$\frac{3\pi g}{4GR}$

b)

$\frac{3g}{4\pi GR}$

c)

$\frac{4g}{3\pi GR}$

d)

$\frac{4g}{3\pi GR^2}$

18.

A satellite of mass $m$ orbits around the Earth with radius $r$ and period $T$ . Another satellite with mass $4m$ takes the same time to complete one revolution. The orbital radius of the second satellite is

a)

$\frac{1}{4}r$

b)

$\frac{1}{2}r$

c)

$r$

d)

$4r$

e)

$2r$

19.

A satellite in lower orbit is sent up to a higher orbit. Choose the CORRECT statement.

a)

Potential energy increases, kinetic energy decreases, total energy increases

b)

Potential energy increases, kinetic energy increases, total energy increases

c)

Potential energy decreases, kinetic energy decreases, total energy increases

d)

Potential energy decreases, kinetic energy decreases, total energy decreases

20.

A satellite of mass $m$ orbits around the Earth with radius $r$ and period $T$ . A second satellite of mass $4m$ when placed in the exact same orbit would have period of

a)

$\frac{1}{4}T$

b)

$\frac{1}{2}T$

c)

$T$

d)

$4T$

e)

$2T$

21.

Choose the CORRECT statement.

a)

Johannes Kepler discovered that planets move around the Sun in circular orbits.

b)

Galileo got into trouble with the government of his time because he believed that the moon revolved around the Earth.

c)

Newton got into a bitter rivalry with Leibniz over his law of gravity.

d)

Tycho Brahe was a Danish astronomer who discovered that planets revolved around the Sun.

22.

Two objects with masses $m_1$ and $m_2$ separated by distance $r$ exert a gravitational force of magnitude $F$ on each other. A third object with mass $m_3$ is three times of $m_2$ and is separated from $m_1$ by twice the distance $r$ . What is the magnitude of gravitational force between $m_1$ and $m_3$ ?

a)

0.75 $F$

b)

1.33 $F$

c)

3 $F$

d)

0.25 $F$

23.

Choose the WRONG statement.

a)

Newton's law of gravity helped to discover the planet Neptune.

b)

Newton came up with three laws of motion.

c)

Newton's law of gravity helped sending human to the moon.

d)

Newton's gravity could explain the orbit of planet Mercury around the Sun.

24.

"Light always takes the shortest path." This statement refers to

a)

Kepler's Third Law

b)

Einstein's Theory of Special Relativity.

c)

Newton's Law of Motion

d)

Fermat's Principle

25.

The speed of light is

a)

The same regardless of where the light travels.

b)

The same regardless of how fast the observer is moving.

c)

Dependent on the colour of light.

d)

Slower in the presence of gravity.

26.

Planet A has mass $m_A$ and radius $r_A$ . Planet B is 3 times the mass and two times the radius of planet A. Planet C is 4 times the mass of planet B and 3 times the radius of planet A. Assuming all three planets are perfect spheres, which of the following order of decreasing gravitational acceleration on these three planets is correct?

a)

$g_B>g_C>g_A$

b)

$g_B>g_A>g_C$

c)

$g_C>g_B>g_A$

d)

$g_C>g_A>g_B$

27.

"__________ of experimentation can ever prove me __________; __________ experiment can prove me __________"

---A quote by __________

a)

No amount; wrong; A single; right; Steven Weinberg

b)

No amount; right; A single; wrong; Isaac Newton

c)

A single; right; No amount; wrong; Albert Einstein

d)

No amount; right; A single; wrong; Albert Einstein

28.

Choose the WRONG statement.

a)

General relativity does not explain the gravity experienced by small particles such as electron.

b)

General relativity does not predict quantum superposition.

c)

General relativity is not incompatible with Standard Model

d)

General relativity does not contradict special relativity

29.

What would happen if the Sun suddenly disappears?

a)

All the planets will immediately experience darkness.

b)

The Earth would move away from its usual orbit after more than 8 minutes.

c)

The moon will no longer orbit around the Earth.

d)

All other planets will orbit around the Earth

30.

Which of the following DOES NOT prove Einstein's Theory of General Relativity to be correct?

a)

Image of a black hole obtained in 2019.

b)

Photographs of stars during a Solar eclipse in 1919.

c)

Detection of Gravity Wave in 2016.

d)

Elliptical orbits of planets around the Sun.

Grand Final STEM Challenge 2021 for Physics

Total questions: 30

Worksheet time: 12mins

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