A Level Competitive Quiz First Edition

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Question 1 of 61

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Question 2 of 61

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Question 3 of 61

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Question 4 of 61

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Question 5 of 61

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Question 6 of 61

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Question 7 of 61

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Question 8 of 61

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Question 9 of 61

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Question 10 of 61

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Question 11 of 61

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Question 12 of 61

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Question 13 of 61

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Question 14 of 61

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Question 15 of 61

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Question 16 of 61

Cubes of hard-boiled egg white are placed in test-tubes containing 5 cm 3 of water. Other
substances are added to each tube as shown in the chart. The tubes are left for eight hours and
then tested for amino acids.

Which tubes show that pepsin is an enzyme?

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Question 17 of 61

Which graph shows the effect of temperature on enzyme-controlled reactions?

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Question 18 of 61

Force exerted on a body changes it's

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Question 19 of 61

Protease breaks down proteins into amino acids.
In the ‘lock and key’ hypothesis, what is the lock and what is the key?

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Question 20 of 61

In an experiment to investigate the effects of heat on germinating barley grains, three petri
dishes were set up as shown in diagram 1 and left for 3 days. A solution of iodine in potassium
iodide was then added to the starch-agar substrate. The results are shown in diagram 2, in which
the shaded areas went blue / black, indicating the presence of starch.

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Question 21 of 61

Enzyme action can be explained by the lock and key hypothesis.
Where is the active site and which acts as the lock or key?

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Question 22 of 61

There are two statements Statement A :Rate of change of momentum corresponds to force Statement B :Rate of change of momentum corresponds to Kinetic Energy Which one of the following is correct?

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Question 23 of 61

What is produced as a result of digestion by a protease?

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Question 24 of 61

A truck and car are moving on a plane road with same kinetic Energy. They are brought to rest by application of brakes which provide equal retarding forces. Which one of the following statements is true?

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Question 25 of 61

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?

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Question 26 of 61

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?

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Question 27 of 61

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

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Question 28 of 61

The diagrams represent an enzyme molecule and its substrate.
Which diagram shows these molecules after they are heated to 100 o C?

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Question 29 of 61

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?

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Question 30 of 61

Which chemical test shows the presence of an enzyme in a biological washing powder?

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Question 31 of 61

Which graph shows how an enzyme catalysed reaction in the alimentary canal varies with
temperature?

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Question 32 of 61

The diagram represents stages in the breakdown of starch to maltose by the enzyme amylase.

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Question 33 of 61

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?

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Question 34 of 61

Which of the following connects with the word growth?

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Question 35 of 61

Which of the following connects with the word respiration?

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Question 36 of 61

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?

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Question 37 of 61

Which part corresponds to the cervix?

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Question 38 of 61

Where does the embryo develop into the foetus?

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Question 39 of 61

Which of the following connects with the word nutrition?

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Question 40 of 61

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?

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Question 41 of 61

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?

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Question 42 of 61

Regions in a thermometer defined or specified and clearly separated by the stated/standard point

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Question 43 of 61

Consider the equation ΔQ = ΔU + ΔW where the symbols represent their usual meanings. ΔU represents

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Question 44 of 61

The Gradient of a cooling curve at a point p represents:

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Question 45 of 61

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.

What is the rate of loss of heat to the surroundings at the constant temperature of 45 degree Celsius.

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Question 46 of 61

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?

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Question 47 of 61

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?

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Question 48 of 61

What us the specific heat capacity of the metal, taking into account the loss of heat to the surrounding

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Question 49 of 61

Which of these is NOT a characteristic of a good thermometer?

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Question 50 of 61

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?

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Question 51 of 61

Which of these processes is closely associated with the formula ΔQ = mass x S.H.C x temp rise

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Question 52 of 61

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?

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Question 53 of 61

One gram of each of the following chemicals was placed at a distance of 2 cm from a Geiger-Muller tube and counter. The results are given below. The background count was found to be 34 counts/minute. Which chemical has a radioactivity of 18 counts/min?

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Question 54 of 61

Radioactive tracers can be used in medicine to help diagnose problems with for example, blood supply, liver and lung function. The patient is injected with an aqueous solution containing a small amount of the radioisotope (in the case of lungs, air containing a little radioactive gas). The location and movement of the tracer can followed by standing the patient against a detection screen. Why is an alpha emitting radioisotope NOT suitable as a tracer?

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Question 55 of 61

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?

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Question 56 of 61

The half-life of radioactive thorium-234 is 24 days. A sample contains 8g of thorium-234. After how many days will it contain only 0.25g of thorium-24?

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Question 57 of 61

ii) What is the condition required to move the block without slipping

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Question 58 of 61

Which of the following radiations is given out by radioactive substances?

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Question 59 of 61

A particle of weight W resting a smooth(frictional less) inclined plain AB with the help of force F acting on the particle at angle θ with the line AB find the force F and normal reaction

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Question 60 of 61

The emissions from four different radioactive sources where tested to see which materials would absorb and stop the radiation. The amount of radiation passing through was measured with a Geiger Counter in counts/second (c/s). From the data, which source gives out mainly ALPHA radiation?

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Question 61 of 61

Which of the following radioactive sources would need the greatest thickness of lead to prevent harmful radiation escaping into the environment?

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