A Level Competitive Quiz First Edition

61 Questions

Quiz Description

A Level Competitive Quiz First Edition with 15 Questions each in Physics, Mathematics, Chemistry, and Biology. 

Have fun !!!

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15:

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16:

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?


<p>Cubes of hard-boiled egg white are placed in test-tubes containing 5 cm 3 of water. Other<br> substances are added to each tube as shown in the chart. The tubes are left for eight hours and<br> then tested for amino acids.<br> <br> <br> Which tubes show that pepsin is an enzyme?</p>
Correct
  • 1:
    1 and 6
  • 2:
    2 and 7
  • 3:
    4 and 5
  • 4:
    5 and 6
17:

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


<p>Which graph shows the effect of temperature on enzyme-controlled reactions?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
18:

Force exerted on a body changes it's


Correct
  • 1:
    Direction of motion
  • 2:
    Momentum
  • 3:
    Kinetic energy
  • 4:
    All the above
19:

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


<p>Protease breaks down proteins into amino acids.<br> In the ‘lock and key’ hypothesis, what is the lock and what is the key?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
20:

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.


<p>In an experiment to investigate the effects of heat on germinating barley grains, three petri<br> dishes were set up as shown in diagram 1 and left for 3 days. A solution of iodine in potassium<br> iodide was then added to the starch-agar substrate. The results are shown in diagram 2, in which<br> the shaded areas went blue / black, indicating the presence of starch.</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
21:

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


<p>Enzyme action can be explained by the lock and key hypothesis.<br> Where is the active site and which acts as the lock or key?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
22:

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?


Correct
  • 1:
    A only
  • 2:
    B only
  • 3:
    Both A and B are correct
  • 4:
    Both A and B are wrong
23:

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


Correct
  • 1:
    amino acids
  • 2:
    fatty acids
  • 3:
    glucose
  • 4:
    glycerol
24:

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?


Correct
  • 1:
    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?
  • 2:
    Distance traveled by car is shorter then truck before coming to rest
  • 3:
    Distance traveled depends on individual velocity of both the vehicles
  • 4:
    Both will travel same distance before coming to rest
25:

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
26:

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
27:

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.
28:

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


<p>The diagrams represent an enzyme molecule and its substrate.<br> Which diagram shows these molecules after they are heated to 100 o C?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
29:

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
30:

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


Correct
  • 1:
    Benedict’s
  • 2:
    biuret
  • 3:
    ethanol emulsion
  • 4:
    iodine solution
31:

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


<p>Which graph shows how an enzyme catalysed reaction in the alimentary canal varies with<br> temperature?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
32:

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


<p>The diagram represents stages in the breakdown of starch to maltose by the enzyme amylase.</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
33:

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
34:

Which of the following connects with the word growth?


Correct
  • 1:
    embryo cells rapidly dividing
  • 2:
    the joining of the two nuclei from a sperm cell and an ovum (egg cell)
  • 3:
    minerals passing through the placenta to the foetus
  • 4:
    oxygen passing through the placenta to the foetus
35:

Which of the following connects with the word respiration?


Correct
  • 1:
    the joining of the two nuclei from a sperm cell and an ovum (egg cell)
  • 2:
    oxygen passing through the placenta to the foetus
  • 3:
    minerals passing through the placenta to the foetus
  • 4:
    embryo cells rapidly dividing
36:

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
37:

Which part corresponds to the cervix?


<p>Which part corresponds to the cervix?</p>
Correct
  • 1:
    part R
  • 2:
    part Z
  • 3:
    part U
  • 4:
    part N
38:

Where does the embryo develop into the foetus?


<p>Where does the embryo develop into the foetus?</p>
Correct
  • 1:
    oviduct
  • 2:
    ovary
  • 3:
    vagina
  • 4:
    uterus
39:

Which of the following connects with the word nutrition?


Correct
  • 1:
    oxygen passing through the placenta to the foetus
  • 2:
    the joining of the two nuclei from a sperm cell and an ovum (egg cell)
  • 3:
    the joining of the two nuclei from a sperm cell and an ovum (egg cell)
  • 4:
    embryo cells rapidly dividing
40:

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
41:

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
42:

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


Correct
  • 1:
    Fixed points
  • 2:
    Temperature scales
  • 3:
    The stream points
  • 4:
    The thermodynamic scale
43:

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


Correct
  • 1:
    The heat or energy given to a system
  • 2:
    The external work done
  • 3:
    The mean kinetic energy
  • 4:
    The change in internal energy
44:

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


Correct
  • 1:
    The rate of fall of temperature
  • 2:
    Has no physical significance
  • 3:
    The rate of heat lost
  • 4:
    The rate of energy transferred per second
45:

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.


Correct
  • 1:
    8W
  • 2:
    10W
  • 3:
    12W
  • 4:
    14W
46:

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
47:

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
48:

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


Correct
  • 1:
    600Jkg-1K-1
  • 2:
    600JKg-1Kg-1K-2
  • 3:
    600J2Kg-1K-1
  • 4:
    600JKg-1K-3
49:

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


Correct
  • 1:
    Reproducible
  • 2:
    Sensitive
  • 3:
    Should have a wide range
  • 4:
    Should not be short.
50:

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
51:

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


Correct
  • 1:
    Mechanical
  • 2:
    Thermal process
  • 3:
    Electrical
  • 4:
    Internal energy
52:

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
53:

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?


Correct
  • 1:
    potassium chloride, 72 counts/min
  • 2:
    sodium chloride, 35 counts/min
  • 3:
    copper sulphate, 52 counts/min
  • 4:
    calcium carbonate, 39 counts/min
54:

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?


Correct
  • 1:
    alpha radiation is too penetrating and passes through the detector screen
  • 2:
    alpha radiation cannot penetrate the body to reach the detector screen
  • 3:
    alpha radiation is biologically the most harmful
  • 4:
    alpha radiation produces unwanted side-effects on the patient
55:

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
56:

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?


Correct
  • 1:
    72 days
  • 2:
    48 days
  • 3:
    120 days
  • 4:
    96 days
57:

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


Correct
  • 1:
    μB/μm > M/m
  • 2:
    μB/μm > m/M
  • 3:
    μB/μm < M/m
  • 4:
    μB/μm < m/M
58:

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


Correct
  • 1:
    ultraviolet
  • 2:
    radiowave
  • 3:
    gamma
  • 4:
    infrared
59:

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


Correct
  • 1:
    (Wcosθ)/sinα, [Wcos(α - θ)]/cosθ
  • 2:
    (Wsinα)/cosθ, [Wcos(α + θ)]/cosθ
  • 3:
    (Wsinα)/cosθ, [Wsin(α + θ)]/cosθ
  • 4:
    none of the above
60:

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?


<p>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?</p>
Correct
  • 1:
    Source W
  • 2:
    Source Y
  • 3:
    Source Q
  • 4:
    Source Z
61:

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


Correct
  • 1:
    alpha and beta emitting source
  • 2:
    beta emitting source
  • 3:
    gamma emitting source
  • 4:
    alpha emitting source

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A Level Competitive Quiz First Edition
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