WEEKEND COMPETITION QUIZ O level Science 19th of November 2022

40 Questions

Quiz Description

This quiz is made up of 40 questions, 10 Questions each in Physics, Chemistry, Computer science and Biology.

1:

Which of the statements about energy conversion is true?


Correct
  • 1:
    An electrical motor converts kinetic energy to electrical energy
  • 2:
    A loud speaker converts electrical energy to sound energy
  • 3:
    An electrical heater converts heat energy to electrical energy
  • 4:
    A burning log of wood converts potential energy to heat energy.
2:

Potential energy and Kinetic energy are type of ?.


Correct
  • 1:
    Electrical energy
  • 2:
    Mechanical energy
  • 3:
    Magnetic energy
  • 4:
    Thermal energy
3:

Which of the following is a 'CONDENSATION POLYMERISATION' type of reaction?


Correct
  • 1:
    hexane ==> ethene + butane
  • 2:
    carbon dioxide + water ==> glucose + oxygen
  • 3:
    glucose + oxygen ==> carbon dioxide + water
  • 4:
    glucose ==> starch + water
4:

Which of the following chemical reagents and reaction conditions is used in to 'breakdown protein into amino acids'?


Correct
  • 1:
    acidified potassium dichromate(VI)
  • 2:
    steam and phosphoric(V) acid catalyst
  • 3:
    hydrogen gas and nickel catalyst
  • 4:
    heating with hydrochloric acid
5:

A sound wave travel through air at a speed of 330m/s. if the frequency of the wave is 20Hz, the wavelength is?


Correct
  • 1:
    0.06m
  • 2:
    16.5m
  • 3:
    6.600m
  • 4:
    33m
6:

The wave property that makes it possible for sound to be heard round a bend is ?.


Correct
  • 1:
    diffration
  • 2:
    reflection
  • 3:
    interference
  • 4:
    refraction
7:

Zener diode is used for


Correct
  • 1:
    amplification
  • 2:
    rectification
  • 3:
    stabilisation
  • 4:
    all of the above
8:

Give the name of materials which contain lots of free electrons.


Correct
  • 1:
    insulators
  • 2:
    conductors
  • 3:
    semiconductors
  • 4:
    None of the above
9:

A series circuit consists of three resistors. Two resistors are 1.4 k each. The total resistance is 12 k. The value of the third resistor


Correct
  • 1:
    92 k ohm
  • 2:
    920 ohm
  • 3:
    9200 ohm
  • 4:
    None of the above
10:

A block A of mass m1 is released from top of smooth inclined plane and it slides down the plane. Another block of mass m2 such that m2 > m1is dropped from the same point and falls vertically downwards. Which one of the following statements will be true if the friction offered by air is negligible?


Correct
  • 1:
    Both blocks will reach ground at same time
  • 2:
    Both blocks will reach ground with the same speed
  • 3:
    speed of both the blocks when they reach ground will depend on their masses
  • 4:
    Block A reaches ground before block B
11:

A 6 kg object is subject to three forces

F1 = 20i + 30j N
F2 = 8i - 50j N
F3 = 2i + 2j N

What is the acceleration of object


Correct
  • 1:
    5i + 3j
  • 2:
    5i - 3j
  • 3:
    3i + 5j
  • 4:
    3i - 5j
12:

There are two statements
Statement A Newton’s first law in valid from the pilot in an aircraft which is taking off
Statement B Newton’s first law in valid from the observer in a train moving with constant velocity
Which of the following is correct


Correct
  • 1:
    A only
  • 2:
    B only
  • 3:
    Both A and B are correct
  • 4:
    Both A and B are wrong
13:

It is suspected that a lollipop contains traces of a poisonous green dye (boiling point 73 °C) as well as two harmless orange and red dyes (boiling points 69 °C and 73 °C respectively).

What is the best method by which the green dye may be detected?


Correct
  • 1:
    filtration
  • 2:
    fractional distillation
  • 3:
    paper chromatography
  • 4:
    recrystallisation
14:

The two statements are about the fractional distillation of crude oil. The statements may or may not be correct. They may or may not be linked.

statement 1: Fractional distillation is used to separate crude oil into useful fractions.

statement 2: The fractions with lower boiling points are found at the top of the fractionating column.

What is correct about these two statements?


Correct
  • 1:
    Both statements are correct and statement 2 explains statement 1.
  • 2:
    Both statements are correct but statement 2 does not explain statement 1.
  • 3:
    Statement 1 is correct but statement 2 is incorrect.
  • 4:
    Statement 1 is incorrect but statement 2 is correct.
15:

Which property shows that a liquid is pure?


Correct
  • 1:
    It turns anhydrous copper(II) sulphate blue.
  • 2:
    It is colourless and odourless.
  • 3:
    It has no effect on red or blue litmus paper.
  • 4:
    It boils at a fixed temperature at a given pressure.
16:

A hollow metal cylinder of mass 0.5kg is heated electrically by a 12W heater in a room at 15-degree Celsius cylinder temperature rises uniformly to 25 degree Celsius in 5 minutes and later becomes constant at 45 degree Celsius.

Assuming the rate of heat loss is proportional to the excess temperature over the surroundings. What is the rate of loss at 20 degree Celsius.


Correct
  • 1:
    1W
  • 2:
    2W
  • 3:
    2.5W
  • 4:
    2Js^-2
17:

Which of these principles utilizes the three methods of heat transfer?


Correct
  • 1:
    Greenhouse effect
  • 2:
    Hall effect
  • 3:
    Moving photons
  • 4:
    Compton effect
18:

A closed metal vessel contains water at 30 degree Celsius. The vessel has a surface area of 0.5m square and a uniform thickness of 4mm. if the outside temperature is 15 degree Celsius. What is the loss per minute by conduction? (Thermal conductivity of metal, k=400Wm-1K-1


Correct
  • 1:
    1.8 x 10^8 J
  • 2:
    4.5 x 10^7 J
  • 3:
    3.8 x 10^7 J
  • 4:
    5.1 x 10^8 J
19:

Information is given below on the reactivity of four metals Wa, Xb, Yc and Zd (NOT their real chemical symbols) ... [9f-63] ... Metal Wa does not readily react with dilute acid ... Metals Xb and Yc react slowly with acid ... Metal Zd will displace Yc from the sulphate salt solution of Yc (YcSO4(aq)) ... Metal Zd will NOT displace Xb from the chloride salt solution of Xb (XbCl2(aq)) If their reactivity order is from the most reactive (1) (2) (3) (4) to the least reactive, which metal corresponds to (2), the 2nd most reactive of the four metals?


Correct
  • 1:
     metal Yc
  • 2:
      metal Zd
  • 3:
     metal Wa
  • 4:
     metal Xb
20:

Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glowed red without further heating to form a dark grey dull solid. Which statement is TRUE about the contents of the test tube in the experiment?


Correct
  • 1:
     at the end they cannot be separated with a magnet
  • 2:
     at the end they are a mixture
  • 3:
     at the start they are a compound
  • 4:
     at the start they cannot be separated with a magnet
21:

Which of the following is TRUE about plants?


Correct
  • 1:
     if a plant is enclosed in an air tight glass jar, and the jar covered in black plastic sheeting, the oxygen level will rise and the carbon dioxide level will fall
  • 2:
     if a plant is enclosed in an air tight glass jar in sunlight, the oxygen level will fall and the carbon dioxide level will rise
  • 3:
     most of the palisade cells for photosynthesis are on the upper side of leaves
  • 4:
     one big root is more efficient than lots of liitle roots for absorbing nutrients and water
22:

Which is a simple test for chlorophyl?


Correct
  • 1:
     it gives a blue-black colour with dilute iodine solution
  • 2:
     it re-ignites a glowing splint which bursts into flame
  • 3:
     it gives a white precipitate when bubbled into limewater (turns cloudy or 'milky')
  • 4:
     it forms a green solution when dissolved in alcohol
23:

The gases from (i) air breathed in, (ii) air breathed out, (iii) just above a lit bunsen burner flame and (iv) the gases left over after burning a candle inside an up-turned beaker where analysed. From the results quoted below, which analysis is most likely to be from the bunsen flame?


Correct
  • 1:
    74% nitrogen, 1% oxygen, 11% carbon dioxide, 14% water vapour
  • 2:
     75% nitrogen, 10% oxygen, 8% carbon dioxide, 7% water vapour
  • 3:
     78% nitrogen, 21% oxygen, 0.04% carbon dioxide, 1% water vapour
  • 4:
     76% nitrogen, 15% oxygen, 4% carbon dioxide, 5% water vapour
24:

Which statement is FALSE when comparing respiration and burning a fuel?


Correct
  • 1:
     both respiration and burning produce waste water and carbon dioxide
  • 2:
      both respiration and burning only release energy as heat
  • 3:
     respiration is slow and controlled, burning is rapid and not controlled
  • 4:
     both respiration and burning use up oxygen
25:

The physical features of plants are the result of several factors. They can genetically inherit characteristics from the parent seeds or they can be due to 'environmental' factors e.g. rainfall or soil fertility. Which of the following factors applies to a plants flower colour?


Correct
  • 1:
     a combination of genetic and environmental factors
  • 2:
     nothing to do with genetic or environmental factors
  • 3:
     only environmental factors
  • 4:
     only what is genetically inherited from your parents genes
26:

Which of the following is NOT true?


Correct
  • 1:
     non-identical twins grow from the same fertilised egg
  • 2:
     identical twins are formed from a fertilised egg that divides into two complete cells
  • 3:
     fertilizations is when the nuclei of the egg cell and sperm combine
  • 4:
     genetic information is stored in the cell nucleus
27:

A healthy diet needs a balance of many things. Which is the nutrient solvent for the chemical reactions of life?


Correct
  • 1:
    protein
  • 2:
    fats
  • 3:
    minerals
  • 4:
    water
28:

Small amounts of minerals and vitamins are needed for good health and vitality! Which of the following dietary needs is mainly obtained from vegetables and fruit, but not meat?


Correct
  • 1:
    iron
  • 2:
    calcium
  • 3:
    fluorine
  • 4:
    vitamin C
29:

Only two of the following statements accurately describe what happens in the mouth.

1 Amylase breaks down large starch molecules into smaller maltose molecules.

2 Chewing increases the surface area of food for digestion.

3 Saliva emulsifies fats into smaller droplets.

4 Teeth break up large insoluble molecules into smaller soluble molecules.

Which statements are correct?


Correct
  • 1:
    1 and 2
  • 2:
    2 and 3
  • 3:
    3 and 4
  • 4:
    1 and 4
30:

Which statement about enzymes is essential to the lock and key hypothesis?


Correct
  • 1:
    Enzyme molecules are catalysts.
  • 2:
    Enzyme molecules can be damaged by high pH values.
  • 3:
    Enzyme molecules can be damaged by high temperatures.
  • 4:
    Enzyme molecules each have a distinct shape.
31:

With respect to a network interface card, the term 10/100 refers to


Correct
  • 1:
    protocol speed
  • 2:
    a fiber speed
  • 3:
    megabits per seconds
  • 4:
    minimum and maximum server speed
32:

Suppose that you have a the maintenance package identifies several possible field replaceable units (FRUs) that will resolve the problem. What should you do after turning the power off?


Correct
  • 1:
    Replace the indicated parts, one at a time in the recommended sequence, until the problem is resolved; return unused FRUs to stock
  • 2:
    Replace all of the indicated FRUs at once and return the machine to the customer if the problem is resolved
  • 3:
    Follow the same procedure as in ays replace the system board first if it is on the list of possible FRUs If multiple FRUs are indicated, then software is the most likely source of the problem
  • 4:
    None of the above
33:

___________ ensures the integrity and security of data that are passing over a network.


Correct
  • 1:
    Firewall
  • 2:
    Antivirus
  • 3:
    Pentesting Tools
  • 4:
    Network-security protocols
34:

The attack that focuses on capturing small packets from the network transmitted by other computers and reading the data content in search of any type of information is ____


Correct
  • 1:
    Phishing
  • 2:
    Exploits
  • 3:
    Eavesdropping
  • 4:
    Scams
35:

An algorithm in encryption is called ______


Correct
  • 1:
    Algorithm
  • 2:
    Procedure
  • 3:
    Cipher
  • 4:
    Module
36:

S/MIME is abbreviated as __________________


Correct
  • 1:
    Secure/Multimedia Internet Mailing Extensions
  • 2:
    Secure/Multipurpose Internet Mailing Extensions
  • 3:
    Secure/Multimedia Internet Mail Extensions
  • 4:
    Secure/Multipurpose Internet Mail Extensions
37:

Which of the following is not a strong security protocol?


Correct
  • 1:
    HTTPS
  • 2:
    SSL
  • 3:
    SMTP
  • 4:
    SFTP
38:

It is desired to send a sequence of computer screen images over an optical fiber. The screen is 480 x 640 pixels, each pixel being 24 bits. There are 60 screen images per second. How much bandwidth is needed, and how many microns of wavelenth are needed for this band at 1.30 microns?


Correct
  • 1:
    1.0 x 105 microns
  • 2:
    2 x 105 microns
  • 3:
    2.5 x 105 microns
  • 4:
    5 x 105 microns
39:

A field in the Ethernet message packet is


Correct
  • 1:
    type
  • 2:
    data
  • 3:
    address
  • 4:
    non of the above
40:

A bridge has access to which address of a station on the same network ?


Correct
  • 1:
    physical
  • 2:
    network
  • 3:
    service access point
  • 4:
    all of the above

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WEEKEND COMPETITION QUIZ O level Science 19th of November 2022
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