VFA Mixed Practice Test #312

Question 1

The lens formula relates image distance v, object distance u, and focal length f as:

Accepted Answer

1/f = 1/v − 1/u — Cartesian sign convention: 1/v − 1/u = 1/f for lenses.

Answer

1/f = 1/v + 1/u

Answer

f = v − u

Answer

f = v + u

Question 2

Biopesticide Bacillus thuringiensis (Bt) produces:

Accepted Answer

Cry toxins — kills larvae of moths/butterflies — Specific to insect gut. Bt cotton, Bt brinjal use transgenic Bt gene. Safe for humans (no receptors in our gut).

Answer

Antibiotics

Answer

Virus

Answer

Enzymes

Question 3

Which teaching aid is most effective for demonstrating complex scientific processes in a high school classroom?

Accepted Answer

B. Interactive simulations — Interactive simulations are most effective for demonstrating complex scientific processes as they allow students to engage dynamically with the content. Static posters, chalkboard diagrams, and printed handouts are less effective for complex processes due to their lack of interactivity and limited ability to convey dynamic information.

Answer

A. Static posters

Answer

C. Chalkboard diagrams

Answer

D. Printed handouts

Question 4

'___ rose is the loveliest of all flowers.'

Accepted Answer

The — Definite article 'The' before a noun used as representative of a class.

Answer

A

Answer

An

Answer

None

Question 5

When is World Environment Day observed?‌​‍

Accepted Answer

5 Jun — 5 June.‌​‍

Answer

22 Mar

Answer

22 Apr

Answer

16 Sep

Question 6

Kerala cabinet Chief Secretary (top bureaucrat):

Accepted Answer

IAS officer — Senior-most IAS officer of state.

Answer

Political

Answer

Elected

Answer

Judge

Question 7

Great Barrier Reef length:‌​‍

Accepted Answer

2300 km — World's largest coral system.‌​‍

Answer

3000 km

Answer

500 km

Answer

1000 km

Question 8

A teacher wants to demonstrate a complex biological process, such as photosynthesis, with real-time animations and allow students to interactively label parts and answer questions directly on the display. Which teaching aid would be most effective for this purpose?

Accepted Answer

C. Smartboard (Interactive Whiteboard) — A Smartboard offers interactive multimedia capabilities, allowing for dynamic animations, real-time annotations, and direct student engagement. Traditional whiteboards, overhead projectors, and chart papers are primarily static and lack the interactivity required for such a dynamic demonstration.

Answer

A. Overhead Projector

Answer

B. Traditional Whiteboard with markers

Answer

D. Large printed chart paper

Question 9

Electronic configuration of Cr (Z=24):

Accepted Answer

[Ar] 3d⁵ 4s¹ — Half-filled d (3d⁵) is extra-stable. Cu similarly [Ar] 3d¹⁰ 4s¹ — exception to aufbau.

Answer

[Ar] 3d⁴ 4s²

Answer

[Ar] 3d⁶

Answer

[Ar] 4s² 4p⁴

Question 10

Kerala Assembly 2021 winner:‌​‍

Accepted Answer

LDF — LDF retained power.‌​‍

Answer

BJP

Answer

None

Answer

UDF

VFA Mixed Practice Test #312