How many rectangular surfaces are there in a prism?
A prism has 3 rectangular surfaces.
Question ID: 188
Uploaded on: September 18, 2024
Give an example of a semiconductor.
Silicon is a common example of a semiconductor.
Question ID: 189
Uploaded on: September 18, 2024
A thin wire and a thick wire of the same conducting material have the same length. Which one of them will carry more current when connected to the same potential difference? [1]
The thick wire will carry more current when connected to the same potential difference.
Question ID: 190
Uploaded on: September 18, 2024
Mention one misuse of the nuclear fission reaction. OR Which law explains the release of huge amounts of energy in nuclear fusion?
Misuse of Nuclear Fission Reaction:
One misuse of nuclear fission reactions is in the creation of nuclear weapons.
OR
The release of a huge amount of energy in nuclear fusion is explained by Einstein’s mass-energy equivalence principle, which is given by the equation:
E=mc2
Question ID: 191
Uploaded on: September 18, 2024
Match the right column with the left column: [1 × 4 = 4]
Left Column
Right Column
1. The oxide layer protects from attack by the water vapour
a) Cu
2. Group-1 element of the long periodic
table having the least reduced powerb) Be
3. When the metal remains exposed
to air, the metal slowly develops green patches on its surfacec) Al
4. Group 2 element of the long periodic table having the least atomic radius
d) Li
Question ID: 192
Uploaded on: September 18, 2024
Draw the Lewis dot structure of the N2 molecule, (N = 7).
Lewis dot structure of the N2 molecule
Question ID: 193
Uploaded on: September 18, 2024
Which kind of electricity is used in electrolysis? OR Write down the cathode reaction in the electrolysis of acidulated water using platinum electrodes.
Direct current (DC) electricity is used in electrolysis.
OR
Cathode Reaction in the Electrolysis of Acidulated Water Using Platinum Electrodes:
2H2O + 2e- → H2 + 2OH-
This reaction produces hydrogen gas at the cathode.
Question ID: 194
Uploaded on: September 18, 2024
In electroplating gold on brass, what is the electrolyte used?
In electroplating gold on brass, the electrolyte used is typically a gold chloride solution or gold cyanide solution.
Question ID: 195
Uploaded on: September 18, 2024
What colour is formed in the reaction of ammonia with Nessler’s reagent?
The reaction of ammonia with Nessler’s reagent forms a yellow or brown colour.
Question ID: 196
Uploaded on: September 18, 2024
Write down the formula of the precipitate formed when H2S gas is passed through an aqueous solution of silver nitrate. [1] OR Write the name of the compound which is formed by the reaction of nitrogen with magnesium metal at a high temperature.
The formula of the precipitate formed when H₂S gas is passed through an aqueous solution of silver nitrate is Ag2S (silver sulfide).
OR
The compound formed by the reaction of nitrogen with magnesium metal at a high temperature is magnesium nitride.
Question ID: 197
Uploaded on: September 18, 2024
What is the value of the H-C-H bond angle in methane? OR Write the IUPAC name of CH3CH2COOH.
The H-C-H bond angle in methane is 109.5°.
OR
The IUPAC name of CH3CH2COOH is propanoic acid.
Question ID: 198
Uploaded on: September 18, 2024
What is the industrial source of CNG?
The industrial source of CNG (Compressed Natural Gas) is natural gas, which primarily consists of methane (CH4)
Question ID: 199
Uploaded on: September 18, 2024