 # Exam-Style Questions.

## Problems adapted from questions set for previous Mathematics exams.

### 1.

GCSE Higher

(a) Write 0.0000657 in standard form.

(b) Write 2.371 × 104 as an ordinary number.

### 2.

GCSE Higher

The number 1.25 × 10n is a cube number.

Find the smallest possible integer value of n.

### 3.

GCSE Higher

The following table shows the distance from the sun and mass of the eight planets.

Planet Distance from the Sun (km) Mass (tonnes)
Mercury 5.79×107 3.3×1020
Venus 1.08×108 4.87×1021
Earth 1.5×108 5.98×1021
Mars 2.28×108 6.42×1020
Jupiter 7.78×108 1.9×1024
Saturn 1.43×109 5.69×1023
Uranus 2.87×109 8.68×1022
Neptune 4.5×109 1.02×1023

(a) Which planet has the second smallest mass?

(b) Find the difference between the mass of Saturn and the mass of Jupiter.

(c) It is claimed that Saturn is about ten times further from the sun than the Earth. By showing your working explain why you either agree or disagree with this statement.

### 4.

GCSE Higher

At a particular time the distance between Earth and Mercury was $$7.7 \times 10^7$$ km.

A signal was sent from Earth to Mercury travelling at an estimated speed of $$3 \times 10^5$$ km per second.

(a) how long did the signal take to get to Mercury?

The speed of the signal sent from Earth to Mercury was actually less than $$3 \times 10^5$$ km per second.

### 5.

GCSE Higher

A hippopotamus' heart beats approximately $$5.04 \times 10^4$$ times in a day when resting.

The average lifespan of a hippopotamus is $$61$$ years.

(a) Work out an estimate for the number of times a hippopotamus’ heart beats in their lifetime. Give your answer in standard form correct to 3 significant figures. (b) A hippopotamus would eat approximately $$10^6$$ kg of grass in its lifetime. Use this figure to calculate an estimate of how many kilograms of grass a hippopotamus eats each day. Give your answer correct to the nearest kilogram.

### 6.

GCSE Higher

The volume of the Moon is $$2.2 \times 10^{10}$$ km3

The volume of the Saturn is $$8.3 \times 10^{14}$$ km3

How many times larger is the radius of Saturn than the radius of the Moon?

Assume that Saturn and the Moon are both spheres and that the volume $$v$$ of a sphere with radius $$r$$ is given by the following formula.

$$v=\frac43\pi r^3$$

### 7.

GCSE Higher

The surface gravity, $$g$$, of a planet is the gravitational acceleration experienced at its surface. The following formula can be used to find how a planet's gravity compares to Earth's.

$$g=\frac{6.67 \times 10^{-11} \times m}{r^2}$$

Where $$m$$ is the mass of the planet and $$r$$ is the radius.

Find the ratio of the surface gravity on Jupiter and the surface gravity Mars. Give your answer in the form $$n:1$$.

 Mass (kg) Radius (m) Jupiter 1.90 × 1027 6.68 × 107 Mars 6.39 × 1023 3.39 × 106

### 8.

IB Analysis and Approaches

NASA’s Transiting Exoplanet Survey Satellite (TESS) has discovered a planet between the sizes of Mars and Earth orbiting a bright, cool, nearby star. The planet, called L 98-59b, marks the smallest found by TESS yet. The radius of L 98-59b is $$5.42\times 10^6$$ m. (a) Write down the diameter of the planet in kilometers.

The volume of the planet in cubic kilometers can be expressed in the form $$n\times 10^k$$, where $$1 \le n\lt 10,k\in \mathbb Z$$

(b) Find the value of $$n$$ and the value of $$k$$.

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