Dr Dalal Chemistry for Class 8 Solutions. We covered all the Dr Dalal Chemistry for Class 8 Solutions in this post for free so that you can practice well for the exam.
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Dr Dalal Chemistry for Class 8 Objective with Solutions for Students
The soft silvery metallic element that ionizes easily when heated or exposed to light and is present in atomic clocks is:
(a) Californium
(b) Cesium
(c) Calcium
(d) Cerium
Option b – Cesium
The green color seen in firework displays is due to the chloride salt of:
(a) Calcium
(b) Barium
(c) Sodium
(d) Strontium
Option b – Barium
Catalytic converters are generally made from:
(a) Hydrogen
(b) Carbon
(c) Transition metals
(d) Alkali metals
Option c – Transition metals
Burns caused by steam are much more severe than those caused by boiling water because:
(a) Steam pierces through the pores of the body quickly
(b) The temperature of steam is higher
(c) Steam is a gas that engulfs the body quickly
(d) Steam has latent heat
Option d – Steam has latent heat
The atomic theory of matter was first proposed by:
(a) John Dalton
(b) Rutherford
(c) J.J. Thomson
(d) Niels Bohr
Option a – John Dalton
Which one of the following minerals contains mostly silica?
(a) Mica
(b) Quartz
(c) Olivine
(d) Pyroxene
Option b – Quartz
Sodium metal should be stored in:
(a) Alcohol
(b) Kerosene oil
(c) Water
(d) Hydrochloric acid
Option b – Kerosene oil
Which of the following particles has the dual nature of particle-wave?
(a) Proton
(b) Meson
(c) Neutron
(d) Electron
Option d – Electron
Which among the following is the sweetest sugar?
(a) Lactose
(b) Maltose
(c) Glucose
(d) Fructose
Option d – Fructose
Muddy water is treated with alum in the purification process, it is termed:
(a) Adsorption
(b) Coagulation
(c) Emulsification
(d) Absorption
Option b – Coagulation
Ultra-purification of a metal is done by:
(a) Smelting
(b) Leaching
(c) Zone melting
(d) Slagging
Option c – Zone melting
We covered all the dr dalal chemistry for class 8 solutions above in this post for free so that you can practice well for the exam.
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