GCE Ordinary Level — Science Quiz

Q1
What is the primary role of mucous membranes and cilia in the human respiratory tract?
To increase the surface area for gaseous exchange in the alveoli
To trap dust particles and microbes and sweep them away from the lungs
To facilitate the diffusion of oxygen into the blood capillaries
To produce ATP required for the contraction of respiratory muscles
Q2
$P$ , $Q$ , and $R$ are three successive elements in the third period of the periodic table. If $P$ forms a basic oxide and $Q$ forms an amphoteric oxide, what is the most likely chemical formula of the chloride of $R$ ?
$\ce{RCl}$
$\ce{RCl2}$
$\ce{RCl3}$
$\ce{RCl4}$
Q3
The diagram shows an incomplete ray diagram for an object placed in front of a concave mirror. $C$ is the centre of curvature and $F$ is the principal focus. Based on the position of the object, what are the characteristics of the image formed?
Real, inverted and diminished, formed between $C$ and $F$ .
Real, inverted and magnified, formed beyond $C$ .
Virtual, erect and magnified, formed behind the mirror.
Real, inverted and same size, formed at $C$ .
Q4
A helicopter of mass $M$ accelerates vertically upwards with an acceleration $a$ . If $g$ is the acceleration due to gravity, what is the upward lift force $F$ generated by the helicopter's rotor?
$M(g - a)$
$M(a - g)$
$M(g + a)$
$\frac{M}{g + a}$
Q5
Which of the following represents the main structural and functional unit of nervous tissue?
Nephron
Neuron
Muscle fiber
Epithelial cell
Q6
According to the standards of binomial nomenclature, which of the following is the correct way to write the scientific name of the coconut plant when printed?
Cocos nucifera
Cocos Nucifera
Cocos nucifera
cocos nucifera
Q7
A radar station transmits a radio wave pulse towards an aircraft and receives the reflected pulse after $4.0 \times 10^{-4} \text{ s}$ . What is the distance from the radar station to the aircraft? (Speed of radio waves is $3.0 \times 10^8 \text{ m s}^{-1}$ )
$6.0 \times 10^4 \text{ m}$
$1.2 \times 10^5 \text{ m}$
$6.0 \times 10^5 \text{ m}$
$1.2 \times 10^6 \text{ m}$
Q8
The diagram shows the laboratory setup for the preparation and collection of a gas. Identify the gas produced and collected in this setup.
Hydrogen
Oxygen
Carbon dioxide
Nitrogen
Q9
The monomer of a certain polymer is tetrafluoroethene ( $CF_2=CF_2$ ). Which of the following represents the repeating unit of this polymer?
$-CF_2-CF_2-$
$CF_2=CF_2$
$-CH_2-CF_2-$
$-CF_3-CF_3-$
Q10
The diagrams X, Y, and Z represent different structures of polymers.

Which of the following correctly identifies the structures X, Y, and Z respectively?
Linear, Cross-linked, Branched
Linear, Branched, Cross-linked
Branched, Linear, Cross-linked
Cross-linked, Branched, Linear