MCQs

Explanation
Lever, pulley, wedge, wheel, inclined plane, and screw are examples of simple machines. These are basic machines that change the direction or magnitude of a force, making it easier to lift, move, or apply force to an object. There are six types of simple machines : Inclined Plane Lever Wheel and Axle Pulley Wedge Screw

Explanation
The correct answer is: Simple machines magnify the force you use. This statement is true for many simple machines, such as levers, pulleys, and wheel and axle systems. Which are designed to multiply the force you apply, making it easier to lift, move, or apply force to an object.

Explanation
To find the speed, we can use the formula : Speed = Distance / Time Given: Distance = 150 meters Time = 5 seconds Speed = 150 / 5 Speed = 30 m/s So, the cycling speed of the girl is 30 meters per second.

Explanation
Force is the only option that can change an object's speed. According to Newton's second law of motion , force is directly related to an object's acceleration, which is the change in speed over time.

Explanation
Clinical thermometers, also known as medical thermometers . It typically have a narrow range of 35°C to 42°C. Which covers the normal body temperature range of humans (37°C ± 2°C). This allows for accurate measurements of body temperature in medical settings.

Explanation
Laboratory thermometers typically have a range of 10°C to 110°C. It allowing for precise temperature measurements in a variety of laboratory settings.

Explanation
Bacteria are unicellular organisms. They have cell wall but don't have proper nucleus. It doesn't contain chlorophyll . It is used to make medicines, yogurt and cheese. Algae are unicellular with proper cell wall and nucleus. It contain chlorophyll . It causes diseases: Cutleria, Ulva and Volvox.

Explanation
In 1969, Whittaker proposed a system of classification that divided all living organisms into five kingdoms: Monera (bacteria and cyanobacteria) Protista (protozoa, algae, and slime molds) Fungi (mushrooms, molds, and yeasts) Plantae (plants) Animalia (animals)

Explanation
The freezing point of water is 0°C (zero degrees Centigrade).  The boiling point of water is 100°C (one hundred degrees Centigrade).

Explanation
The temperature range of the clinical thermometer is 94°F to 108°F. A clinical thermometer is a device that measures the temperature of the body. A mercury bulb is located at the end of a long, narrow glass tube. The average body temperature is 37° C , but it can range between 35 and 42° C.