THE EFFICIENCY OF A MACHINE IS ALWAYS LESS THAN 100% BECAUSE THE
A. work output is always greater than the work input B. load lifted is always greater than the effort applied C. effort applied is always greater than the load lifted ✓ D. velocity ratio is always greater than the mechanical advantage The answer…
THE RESULTANT OF TWO FORCES ACTING ON AN OBJECT IS MAXIMUM IF THE ANGLE BETWEEN THEM IS
A. 45° B. 0° ✓ C. 90° D. 180° The answer to the question is: B. 0° The resultant of two forces acting on an object is maximum when the angle between them is 0°. This can be explained using the concept…
STEAM CHANGES THE COLOUR OF ANHYDROUS COBALT (II) CHLORIDE FROM
A. blue to pink ✓ B. white to red C. white to green D. blue to white The answer to the question is: A. blue to pink Anhydrous cobalt (II) chloride, also known as cobaltous chloride or cobalt dichloride, is a chemical compound with…
THE PROPERTY WHICH MAKES ALCOHOL SOLUBLE IN WATER IS THE
A. boiling point B. hydrogen bonding ✓ C. ionic character D. covalent nature The answer to the question is: B. hydrogen bonding The property which makes alcohol soluble in water is hydrogen bonding. Hydrogen bonding is a type of intermolecular force that occurs when…
THREE DROPS OF A 1.0 MOL DM-3 SOLUTION OF NAOH ARE ADDED TO 20 CM3 OF A SOLUTION OF PH 8.4. THE PH OF THE RESULTING SOLUTION WILL
A. Close to that of pure water B. Unaltered C. Greater than 8.4 ✓ D. Less than 8.4 The answer to the question is: C. Greater than 8.4 When three drops of a 1.0 mol dm-3 solution of NaOH are added to…
THE PRODUCT OF THE ELECTROLYSIS OF DILUTE SODIUM HYDROXIDE USING PLATINUM ELECTRODES ARE
A. Hydrogen and oxygen gases ✓ B. Water and hydrogen gas C. Water and sodium metal D. Sodium metal and oxygen gas The answer to the question is: A. Hydrogen and oxygen gases When dilute sodium hydroxide (NaOH) is subjected to electrolysis using platinum…
WHEN DISSOLVED IN WATER, NAOH FLAKES SHOW
A. An endothermic change B. An exothermic change ✓ C. A slow reaction D. A rapid reaction The answer to the question is: B. An exothermic change When sodium hydroxide (NaOH) flakes are dissolved in water, they undergo an exothermic change. This means that…
THE CHROMATOGRAPHY SEPARATION OF INK IS BASED ON THE ABILITY OF THE COMPONENTS TO
A. React with solvent B. React with each other C. Dissolve in each other in the column D. Move at different speeds in the column ✓ The answer to the question is: D. Move at different speeds in the column Chromatography is a laboratory…
THE CARNASSIAL TEETH OF A CARNIVOROUS ANIMAL CONSIST OF THE
A. last upper premolar and the first lower molar ✓ B. last upper molar and the last lower molar C. first upper premolar and the lower molar D. first upper molar and the first lower molar The answer to the question is: A. last…
THE ADDITION OF LIME TO CLAYED SOIL SERVES TO
A. aid water retention B. close up the texture C. prevent water logging D. improve capillary action ✓ The answer to the question is: D. improve capillary action The addition of lime to clayed soil serves to improve capillary action. Lime, also known as…
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