541. Electron was discovered by?
✅ D. J.J Thomson
Everyday Science MCQs – Page 28
542. Periodontics deals with ________?
✅ D. Dentistry
543. A moderator is used in nuclear reactor in order to ?
✅ A. Slow down the speed of the neutrons
544. 746 watts are equivalent to________?
✅ C. 1HP
545. Sericulture is the study of which discipline ?
✅ B. silk production
546. Which of the following are the ingredients of gun metal?
✅ D. Copper, Tin and Zinc
547. The most dense and heaviest planet is______?
✅ A. Earth
548. When a warm air is lifted off the surface in temperature depression it is called ___?
✅ B. An occlusion
549. The large dark patches on the Moon’s surface are known as______?
✅ A. Maria, or seas, even though there is no water on the Moon
550. NASA scientists have recently detected water vapor on which Jupiter’s moon?
✅ A. Europa
551. Vitamin A is found in the_______?
✅
552. The chemical name of quartz is:
✅ B. Silicon Dioxide
553. Brass gets discoloured in air because of the presence of which of the following gases in air ___ ?
✅ D. Hydrogen sulphide
554. What kind of weathering takes place on the valley side above the surface of the glacier?
✅ D. Frost shattering
555. Water vapor is ____?
✅ B. A gas
556. speed of sound in dry air at 20 °C is______?
✅ C. 343 m/s
557. Which of the following is commonly called a polyamide ?
✅
558. For water purification, we use?
✅ B. Chlorine
559. What is the weight of the average human brain?
✅ B. 1.2 to 1.4 Kg
560. Tesla is the unit of__________?
✅ B. Magnetic Field Strength