Welcome, Guest
General Science MCQ Practice
Practice General Science questions with instant scoring, correct answer highlighting, detailed solutions and first-click AI explanation caching for missing explanations.
π Questions: 553
π§ Page: 32 / 56
π― 10 per page
Correct: 0/10
Wrong: 0/10
Correct
Wrong
Accuracy
Q. 1987
π 0 views
An F1 car is mostly made up of which material ?
Preparing explanation...
Q. 1986
π 1 views
Through the fused sodium chloride, electric
current can pass out due to the presence of:
Correct answer: B
- Reason: In fused (molten) NaCl, ions are mobile. Free ions (Na+ and Clβ) carry charge, allowing electrical current to pass through the liquid.
- Key concept: Ionic conduction in electrolytes; charge carriers are ions, not electrons in this state.
- Formula hint: Conductivity Ο β Ξ£ ci zi ei ΞΌi, showing ionsβ concentration and mobility drive current.
- Why other options are incorrect: Free electrons conduct in metals, not in molten salts; free molecules are neutral; hence, only free ions enable conduction.
- Exam tip: Remember: molten salts conduct via ions, not electrons.
Q. 1985
π 0 views
Which one among the following is strong
smelling agent used in LPG cylinder to help in
the detection of gas leakage?
Preparing explanation...
Q. 1984
π 1 views
The mountaineers carry oxygen with them because:
Correct answer: B
- Why: At higher altitudes, the air is thinner, so there is less air (lower density) for gas exchange. This means less oxygen reaches the lungs, so mountaineers carry supplemental oxygen.
- Key concept: Air density and partial pressure of oxygen decrease with altitude; effective O2 intake depends on atmospheric pressure.
- Formula/idea: Oxygen availability β ambient pressure Γ O2 fraction; both drop with height.
- Why others are wrong: A is incorrectβthere is still air above 5 km, just thinner. C is not the primary reason. D is falseβair pressure decreases, not increases, with altitude.
- Exam tip: Remember: thinner air at high elevations, not absolute absence of air.
Q. 1983
π 1 views
Which of the following is an example of static
electricity ?
Correct answer: D
- Static electricity is the buildup of electric charge on surfaces due to processes like friction, contact, or induction.
- Glass rod rubbed with silk (A) and Ebonite rod rubbed with wool (B) both create static charges on the surfaces.
- Lightning (C) is a rapid discharge of accumulated static charges in the atmosphere, but the underlying phenomenon is static electricity.
- Therefore, all the above (D) are examples of static electricity.
Q. 1982
π 0 views
Sound-waves from a loud speaker is caused by:
Preparing explanation...
Q. 1981
π 0 views
Magnetic effect of current gives rise to which
force ?
Preparing explanation...
Q. 1980
π 1 views
Quality of petrol is expressed in:
Correct answer: D. Octane number
- Reason: Octane number measures petrolβs resistance to knocking in engines. Higher octane means smoother, more efficient performance.
- Key concept: It quantifies anti-knock tendency; often represented as AKI = (RON + MON)/2 for fuel rating.
- Other options: A Gold number is unrelated; B Cetane number is for diesel ignition delay; C Methane number is for methane/NG fuels.
- Exam tip: Remember petrol rating = octane; diesel = cetane.
Q. 1979
π 1 views
What is the rarest blood type in the world ?
Correct option: C β AB-
- Reason: AB negative is the rarest blood group worldwide, with about 1% of people having it. It is universal for AB donors but rare as a recipient due to Rh- negativity.
- Key concept: Blood type combines ABO (A/B) and Rh factor (positive/negative).
- Why others are incorrect: A, B, AB (without negative) are more common; O+ is very common, not rare.
Q. 1978
π 0 views
Which of the following is not a biofertilizer ?
Preparing explanation...
Correct: 0/10
Wrong: 0/10
Correct
Wrong
Accuracy
0%