LGS Mixed Practice Test #258

Question 1

Which chemical is used in fire extinguishers?‌​‍

Accepted Answer

Sodium bicarbonate — Sodium bicarbonate releases CO₂ to smother flames.‌​‍

Answer

Potassium bicarbonate

Answer

Sodium chloride

Answer

Sodium nitrate

Question 2

Kerala state fish:‌​‍

Accepted Answer

Karimeen (Pearl spot) — Pearl spot (Etroplus suratensis).‌​‍

Answer

Tilapia

Answer

Sardine

Answer

Mackerel

Question 3

Which is the French intelligence agency?‌​‍

Accepted Answer

DGSE — DGSE (Direction Générale de la Sécurité Extérieure) is France's external intelligence agency.‌​‍

Answer

CSIS

Answer

CIRO

Answer

MI6

Question 4

Hitler became German Chancellor in:

Accepted Answer

1933 — Adolf Hitler appointed Chancellor 30 January 1933. Enabling Act March 1933 gave dictatorial powers. Became Führer 1934.

Answer

1918

Answer

1923

Answer

1939

Question 5

Mattupetty dam:‌​‍

Accepted Answer

Munnar (Idukki) — Munnar hills.‌​‍

Answer

Palakkad

Answer

Silent Valley

Answer

Wayanad

Question 6

Black soil is found in ___ district of Kerala.

Accepted Answer

Palakkad — Black soil patches exist in Chittur taluk of Palakkad.

Answer

Kannur

Answer

Kollam

Answer

Wayanad

Question 7

'Entomology' deals with:‌​‍

Accepted Answer

Insects — Entomology = scientific study of insects.‌​‍

Answer

Birds

Answer

Animals

Answer

Human beings

Question 8

Moment of inertia of a thin uniform rod (mass M, length L) about centre is:

Accepted Answer

ML²/12 — I_centre = ML²/12. About end: ML²/3 (parallel-axis theorem: I_end = I_centre + M(L/2)²).

Answer

ML²/3

Answer

ML²/2

Answer

ML²

Question 9

The presence of which functional group in a drug molecule typically increases its water solubility?

Accepted Answer

A. Hydroxyl group (-OH) — The hydroxyl group (-OH) increases water solubility by forming hydrogen bonds with water molecules. Methyl groups are hydrophobic, while halogen and nitro groups generally do not enhance water solubility to the same extent.

Answer

B. Methyl group (-CH3)

Answer

C. Halogen group (-Cl, -Br)

Answer

D. Nitro group (-NO2)

Question 10

During the 'Explain' phase of a 5E model lesson on Newton's laws of motion, a teacher observes students are still confused about the concept of inertia. What is the most constructivist approach for the teacher to address this?

Accepted Answer

B. Ask students to share their current understanding and guide them to correct misconceptions through questioning. — Option B reflects constructivist teaching by addressing misconceptions through student-led discussion and scaffolding. Option A is teacher-centered, C is passive, and D avoids addressing the learning gap—all inconsistent with constructivist principles.

Answer

A. Provide a detailed lecture with diagrams and examples to clarify the concept.

Answer

C. Assign additional textbook readings on the topic for independent study.

Answer

D. Move on to the next topic and revisit inertia in the next lesson.

LGS Mixed Practice Test #258