Q. A sprinter feels cramps and pain in the thigh muscles after a run. This is due to accumulation of -
1) lactic acid
2) CO2
3) pyruvic acid
4) ethanol
Q. A leaf was plucked from a plant on a sunny day and kept for 2 minutes in boiling water. It was subsequently immersed in boiling alcohol and treated with an iodine solution. What will be the final colour of the leaf after the test?
1) Colourless
2) Green
3) Blue
4) White
Q. If the red blood cells (RBCs) of human blood are isolated and diluted in normal saline (an isotonic solution to blood), what will happen to the RBCs?
1) The RBCs will swell
2) The RBCs will swell and burst
3) The RBCs will shrink
4) No change in the diameters of the RBCs
Q. Which one of the following statements regarding bile secreted by the liver is not correct?
1) Bile contains enzymes for digestion of lipids
2) Bile facilitates emulsification of fats
3) Bile neutralizes the acidic pH of the food coming from stomach
4) Bile makes the pH of the food alkaline and facilitates the action of pancreatic enzymes
Q. A person burned a firecracker in front of a cliff and heard its echo 5 seconds after it burst. The distance of the cliff from the person, if the speed of the sound is 340 m/s, is close to -
1) 1700 m
2) 170 m
3) 85 m
4) 850 m
Q. Consider the following statements about the microphone and the speaker of a mobile phone -
1. The microphone converts sound to a mechanical signal.
2. The microphone converts sound to an electrical signal.
3. The speaker converts a mechanical signal to sound.
4. The speaker converts an electrical signal to sound.
Which of the statements given above are correct?
1) 1 and 3
2) 1 and 4
3) 2 and 3
4) 2 and 4
Q. A 100 W electric bulb is used for 10 hours a day. How many units of electrical energy are consumed by the bulb in 3 days (1 unit = 1 kWh)?
1) 3.00
2) 1.08
3) 2.16
4) 0.33
Q. The area under the velocity-time graph for a particle moving in a straight line with uniform acceleration gives -
1) its average velocity
2) its net displacement
3) the distance travelled by it
4) its average speed
Q. The power of a lens of focal length 10 cm is -
1) 0.1 dioptre
2) 1 dioptre
3) 10 dioptre
4) 100 dioptre
Q. Consider the following statements regarding the burning of magnesium ribbon in the air -
1. The white powder of MgO is formed.
2. It is an example of a combustion reaction.
3. Heat and light are produced.
Which of the statements given above is correct?
1) Only 1 and 2
2) Only 1 and 3
3) Only 2 and 3
4) All 1, 2 and 3
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