4721. What melted rock eventually becomes lava?
✅ C. Magma
Everyday Science MCQs – Page 237
4722. Magnalium is an alloy of________?
✅ C. Aluminium and Magnesium
4723. Who invented the safety pin?
✅ C. Walter Hunt
4724. Sedimentary rocks are_____?
✅ B. Porous
4725. Sun revolves around milky way in about _____ million years.
✅ A. 230
4726. At what temperature does silver melt?
✅ C. 961.8 °C
4727. Which of the following has not involuntary muscles?
✅ D. Brains
4728. Which of the following is a Non Metal that remains Liquid at room temperature?
✅ A. Bromine
4729. Which one of the following is a non-metallic mineral?
✅ C. Gypsum
4730. One Joule is equal to_____?
✅ C. 107 ergs
4731. The best conductor of heat among liquid is______?
✅ A. Mercury
4732. Magnifying power of a simple microscope can be increased by ?
✅ A. Decreasing focal length of the lens
4733. The Big Dipper is part of which constellation?
✅ A. Ursa Minor
4734. What type of a mirror is used in anti-shop-lifting-devices?
✅ B. Convex mirror
4735. The rear view mirror of a motor vehicle is ___?
✅ C. Convex
4736. Which is the heaviest metal?
✅ D. Osmium
4737. The yellow colour in photochemical smog is due to the presence of_______?
✅ C. Nitrogen dioxide
4738. Which of the following atmospheric layers help in radio communication?
✅ A. Ionosphere
4739. The Continent Antarctica lies at the_____?
✅ A. South pole
4740. The study of cancer is called________?
✅ D. Oncology