Plus 2 Lecturer Mixed Practice Test #729

Question 1

During muscle contraction, which ion is released from the sarcoplasmic reticulum and binds to troponin, initiating the sliding filament mechanism?

Accepted Answer

C. Calcium (Ca2+) — Calcium ions (Ca2+) are essential for muscle contraction. Upon nerve stimulation, Ca2+ is released from the sarcoplasmic reticulum and binds to troponin, causing a conformational change that exposes myosin-binding sites on the actin filaments, allowing the sliding filament mechanism to proceed. Sodium and potassium are crucial for nerve impulse transmission and muscle action potentials, and chloride helps maintain membrane potential.

Answer

A. Sodium (Na+)

Answer

B. Potassium (K+)

Answer

D. Chloride (Cl-)

Question 2

Kerala Tourism slogan:‌​‍

Accepted Answer

God's Own Country — 'God's Own Country' — coined 1989.‌​‍

Answer

Gods Own

Answer

Kerala the Land

Answer

Paradise

Question 3

Silent Valley declared NP in:

Accepted Answer

1984 — 1984 — declared National Park.

Answer

1980

Answer

1990

Answer

1996

Question 4

The Gutenberg printing press was invented around:‌​‍

Accepted Answer

1450 — Johannes Gutenberg's movable-type printing press (c. ‌​‍1450) in Germany. Revolutionised book production, spread of Reformation, literacy.

Answer

1500

Answer

1600

Answer

1300

Question 5

DNA fingerprinting was developed by:

Accepted Answer

Alec Jeffreys (1984) — Based on VNTRs. Used in forensics, paternity, conservation. Indian version — Lalji Singh (CCMB Hyderabad).

Answer

Watson

Answer

Mendel

Answer

Darwin

Question 6

India G20 presidency:‌​‍

Accepted Answer

2023 — India hosted G20 Summit in New Delhi, September 2023.‌​‍

Answer

2025

Answer

2024

Answer

2022

Question 7

Which is the hardest mineral?‌​‍

Accepted Answer

Diamond — Diamond = 10 on Mohs scale (hardest). Corundum = 9. Topaz = 8.‌​‍

Answer

Quartz

Answer

Topaz

Answer

Corundum

Question 8

The SI unit of acceleration is:

Accepted Answer

m/s² — Acceleration = change in velocity / time; SI unit is m/s².

Answer

m/s

Answer

km/h

Answer

N/kg

Question 9

Which acid is found in tomato, apple and unripe fruits?

Accepted Answer

Malic acid — Malic acid gives tart flavour to apples, grapes; lactic in milk; tartaric in tamarind.

Answer

Lactic acid

Answer

Citric acid

Answer

Formic acid

Question 10

Kerala's first railway station:‌​‍

Accepted Answer

Tirur (1861) — Beypore-Tirur line first.‌​‍

Answer

Palakkad

Answer

Kochi

Answer

Thiruvananthapuram

Plus 2 Lecturer Mixed Practice Test #729