Past paper questions

In the figure, $ABCD$ is a parallelogram. $F$ is a point lying on $AD$. $BF$ produced and $CD$ produced meet at $E$. If $CD:DE=2:1$, then $AF:BC=$

In the figure, $ABC$ is a straight line. If $BD = CD$ and $AB = 10\text{ cm}$, find $BC$ correct to the nearest cm.

In the figure, the two 6-sided polygons show

If the point $(-4,3)$ is rotated anti-clockwise about the origin through $180^{\circ}$, then the coordinates of its image are

The box-and-whisker diagram below shows the distribution of the scores (in marks) of the students of a class in a test.

If the passing score of the test is $50$ marks, then the passing percentage of the class is

The stem-and-leaf diagram below shows the distribution of heights (in cm) of 23 staff members in an office.

[Table]

Find the median of the distribution.

${a-7, a-1, a, a+2, a+4, a+8}$ and ${a-9, a-2, a-1, a+3, a+4, a+6}$ are two groups of numbers. Which of the following is/are true?

I. The two groups of numbers have the same mean.

II. The two groups of numbers have the same median.

III. The two groups of numbers have the same range.

The students' union of a school of $950$ students wants to investigate the opinions of students in the school on the services provided by the tuck shop. A questionnaire is designed by the students' union and only the chairperson and vice-chairperson of the students' union are selected as a sample to fill in the questionnaire. Which of the following are the disadvantages of this sampling method?

I. The sample size is very small.

II. Not all students in the school are selected.

III. Not all students in the school have an equal chance of being selected.

The graph in the figure shows the linear relation between $x$ and $\log_{5} y$. If $y = ab^{x}$, then $a$ =

If $k$ is a real number, then $4k - \frac{6 + ki}{i} =$

Which of the triangular regions in the figure may represent the solution of $\begin{cases} 0 \leq x \leq 6 \\ 0 \leq y \leq 3 \\ x \leq 2y \end{cases}$?

If the 3rd term and the 6th term of an arithmetic sequence are $18$ and $-6$ respectively, then the 2nd term of the sequence is

If the figure shows the graph of $y = f(x)$ and the graph of $y = g(x)$ on the same rectangular coordinate system, then

In the figure, $y=$

Peter invests $P$ at the beginning of each month in a year at an interest rate of $6\%$ per annum, compounded monthly. If he gets $10\,000$ at the end of the year, find $P$ correct to $2$ decimal places.

The figure shows a cuboid $ABCDEFGH$. If the angle between the triangle $ACE$ and the plane $ABCD$ is $\theta$, then $\tan\theta =$

In the figure, $A$, $B$ and $C$ are points lying on the circle. $TA$ is the tangent to the circle at $A$. The straight line $CBT$ is perpendicular to $TA$. If $BC = 6\text{ cm}$, find the radius of the circle correct to the nearest $0.1\text{ cm}$.

Let $a$ be a constant and $-90^\circ < b < 90^\circ$. If the figure shows the graph of $y = a\cos(x^\circ + b)$, then

Bag A contains 2 red balls, 3 green balls and 4 white balls while bag B contains 2 red balls, 3 green balls and 4 yellow balls. If one ball is drawn randomly from each bag, then the probability that the two balls drawn are of different colours is

2 girls and 5 boys randomly form a queue, find the probability that the two girls are next to each other in the queue.

A set of numbers has a mode of $32$, an inter-quartile range of $27$ and a variance of $25$. If $3$ is added to each number of the set and each resulting number is then doubled to form a new set of numbers, find the mode, the inter-quartile range and the variance of the new set of numbers.