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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.
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Q. 3851
π 2 views
'Shock βabsorbers' are usually made of steel as it:
Correct answer: C
- Reason: Shock absorbers must deform and absorb energy but return to shape. Steel has a high modulus of elasticity, meaning it can handle large elastic deformation and efficiently store and release energy, useful for damping vibrations.
- Key concept: Elasticity (modulus of elasticity, E) governs how much a material deforms under stress and how well it recovers after deformation.
- Formula (brief): Stress = E Γ Strain. Higher E gives good elastic response in damping systems.
- Exam tip: Focus on material properties: elasticity, ductility, brittlenessβthese determine suitability for shock absorption.
- Why others are incorrect: A is irrelevant; B says lower elasticity (false for steel in this use); D wrongly asserts no ductile property.
Q. 3850
π 2 views
The function of ball bearing in a wheel is:
Correct option: B
- The ball bearing converts sliding (kinetic) friction into rolling friction. This happens when the wheel rotates on small balls, allowing smooth rolling with much lower resistance.
- Key concept: rolling friction is much smaller than kinetic (sliding) friction because contact is rolling, not sliding, and deformation losses are reduced.
- Tip: In mechanisms, bearings dramatically reduce friction versus bare surfaces.
- Why others are wrong: A increases friction; C static to kinetic is not the mechanism here; D is inaccurate as bearings optimize friction, not just convenience.
Q. 3849
π 4 views
The time period of a pendulum when taken to the Moon would:
Answer: D β increase
- Concept: For a simple pendulum, period T β 2Οβ(L/g).
- On the Moon, gravitational acceleration g is smaller than on Earth, so β(L/g) is larger.
- Thus T becomes longer (slower oscillations) when g decreases.
- Numerical logic: if g decreases, T increases proportional to 1/βg.
Q. 3848
π 3 views
The longest bone in the human body is:
- Correct answer: C. Femur
- The femur is the longest and strongest bone, extending from hip to knee. Its length is about one quarter of body height and it bears much of the body's weight.
- Other options are shorter bones: Ulna (forearm), Humerus (upper arm), Tibia (leg below knee). They are long but not as long as the femur.
- Exam tip: Remember βFemur = longest boneβ for quick recall in anatomy questions.
Q. 3847
π 2 views
Saliva helps in the digestion of:
Correct answer: B - starch
- Key concept: Saliva contains salivary amylase, an enzyme that digests starch in the mouth.
- Process: Starch + H2O --amylase--> maltose (and glucose in small amounts).
- Other options:
- A fats: lipase acts mainly in the small intestine; saliva has minimal fat digestion.
- C proteins: proteases (like pepsin) start in the stomach, not saliva.
- D vitamins: vitamins are absorbed, not digested by saliva.
Q. 3846
π 1 views
Ringworm is a ___________ disease.
Answer: D. fungal
- Reason: Ringworm is caused by fungal dermatophytes that infect the skin, hair, and nails. It is not a worm or parasite.
- Key concept: Fungi have cell walls with chitin and grow as hyphae; diseases are fungal infections like tinea (ringworm).
- Why others are incorrect: A (bacterial), B (protozoan), and C (viral) do not cause ringworm.
- Exam tip: Remember βring = fungal infection of skinβ to distinguish from parasitic worms.
Q. 3845
π 4 views
If all bullets could not be removed from gun shot injury of a man, it may cause poisoning by:
Explanation
- Correct option: Lead
- Why: Bullets are often made of lead. When not removed, lead fragments can slowly leach toxic lead into the body, causing lead poisoning.
- Key concept: Heavy metal toxicity and bioaccumulation from retained foreign bodies.
- Note: If in the body, lead interferes with enzymes and nerve function; there is no chemical that rapidly neutralizes it.
- Exam tip: Retained bullet fragments are a common source of chronic poisoning; always assess for lead exposure in such injuries.
- Why others are incorrect: Mercury, iron, or arsenic are not typical components of standard bullets; arsenic is a poison but not from bullets.
Q. 3844
π 3 views
What happens to a person who receives the wrong type of blood?
Correct answer: C
- Reason: Incompatible blood types trigger antibodies in the recipientβs plasma to bind to foreign RBC antigens, causing RBCs to agglutinate (clump together). This can block vessels and rupture cells.
- Key concept: ABO/Rh blood group incompatibility and agglutination reaction.
- Why others are wrong: Blood vessels do not universally constrict/dilate due to a mismatch (A, B). The spleen/lymph nodes do not deteriorate acutely from a mismatch (D).
- Exam tip: Remember βagglutinationβ is the hallmark of incorrect transfusion.
Q. 3843
π 2 views
Angle of friction and angle of repose are:
Answer: A
- Explanation: For granular materials, the angle of repose (ΞΈ) at which sliding begins equals the angle of friction (Ο) opposing motion. They represent the same limiting slope under static conditions.
- Key concept: Limiting friction angle; tan(Ο) = ΞΌ, and Ο β‘ ΞΈ for cohesionless grains.
- Formula: ΞΈ = Ο; in some texts, tanΟ = ΞΌ, linking friction to the critical slope.
- Exam tip: Remember: βrepose = friction angleβ for powders/grains.
- Why others are wrong: B: not unequal; C: not proportional; D: not none of the above.
Q. 3842
π 3 views
Which of the following is not a nucleon?
Explanation:
- A nucleon is a particle inside the atomic nucleus. Protons and neutrons are nucleons.
- Electrons and positrons are leptons, not nucleons; they do not reside in the nucleus.
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