CDS General Knowledge 2023 Question Paper

A sprinter feels cramps and pain in the thigh muscles after a run. This is due to accumulation of

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 iodine solution. What will be the final colour of the leaf after the test?

If the red blood cells (RBCs) of human blood are isolated and are diluted in normal saline (an isotonic solution to blood), what will happen to the RBCs?

Which one of the following statements regarding bile secreted by liver is not correct?

The blood pressure of a normal human being is found to be $120/80$ mmHg. These 'numbers' represent the blood pressure at

A person burned a firecracker in front of a cliff and heard its echo $5$ s after it burst. The distance of the cliff from the person, if the speed of the sound is $340$ m/s, is close to

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?

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)

The area under the velocity-time graph for a particle moving in a straight line with uniform acceleration gives

The power of a lens of focal length $10$ cm is