LGS Mixed Practice Test #654

Question 1

Iguazu Falls between:‌​‍

Accepted Answer

Argentina-Brazil — Argentina-Brazil border.‌​‍

Answer

Brazil-Paraguay

Answer

Peru-Chile

Answer

Colombia-Venezuela

Question 2

Reynolds number > ~2000 indicates:‌​‍

Accepted Answer

Turbulent flow — Re = ρvd/η. ‌​‍Low Re → laminar (viscous dominant); high Re → turbulent (inertial dominant).

Answer

Static

Answer

Laminar flow

Answer

No flow

Question 3

Ozone layer protects by:‌​‍

Accepted Answer

Absorbing UV-B/C radiation — Stratospheric O₃. ‌​‍Depletion by CFCs. Dobson Units (DU) measure. ‌​‍Antarctic 'hole' discovered 1985. Montreal Protocol 1987.

Answer

Producing O₂

Answer

Cooling Earth

Answer

Blocking all light

Question 4

The horizontal transfer of heat through wind is called:‌​‍

Accepted Answer

Advection — Advection = horizontal heat transfer via wind.‌​‍

Answer

Convection

Answer

Radiation

Answer

Conduction

Question 5

ICC Cricket World Cup 2023 winner:‌​‍

Accepted Answer

Australia — Australia beat India in the final at Ahmedabad.‌​‍

Answer

South Africa

Answer

England

Answer

India

Question 6

Malala was awarded the Nobel Peace Prize at the age of:

Accepted Answer

17 — Born July 1997; awarded December 2014 at age 17 — youngest Nobel laureate ever.

Answer

14

Answer

15

Answer

16

Question 7

A common pitfall observed when integrating new ICT tools into the classroom is:

Accepted Answer

B. Using ICT merely as a substitute for traditional methods without pedagogical transformation. — A significant pitfall in ICT integration is using technology merely to replicate traditional teaching methods (e.g., using a projector to display a textbook page) instead of leveraging its unique capabilities for transformative learning experiences. True integration requires a shift in pedagogy to harness ICT's potential for interactive, collaborative, and personalized learning.

Answer

A. Over-reliance on the teacher for technical support.

Answer

C. Students becoming overly engaged and motivated by the technology.

Answer

D. Increased administrative burden for the school management.

Question 8

CoWIN was for:‌​‍

Accepted Answer

COVID vaccination — COVID vaccination registration platform.‌​‍

Answer

Census

Answer

Cricket

Answer

Banking

Question 9

In an aseptic processing area for sterile product manufacturing, which ISO classification represents the highest level of cleanliness (i.e., fewest particles allowed)?

Accepted Answer

C. ISO 5 — ISO classification systems rank cleanrooms by the number of particles allowed per cubic meter of air, with lower ISO numbers indicating a higher level of cleanliness. ISO 5 (equivalent to Class 100 or Grade A) is the highest standard for critical operations where sterile products are exposed, such as filling zones. ISO 7 and ISO 8 represent progressively less stringent cleanliness levels for surrounding areas.

Answer

A. ISO 7

Answer

B. ISO 8

Answer

D. ISO 9

Question 10

Isoelectronic species have:

Accepted Answer

Same number of electrons — e.g., Na⁺, Mg²⁺, O²⁻, F⁻, Ne all have 10 e⁻. Sizes differ with nuclear charge.

Answer

Same mass

Answer

Same neutrons

Answer

Same protons only

LGS Mixed Practice Test #654