The root pressure phenomenon in plants is primarily due to which of the following?

The correct answer is C: Active transport of mineral ions into xylem, creating osmotic gradient. Root pressure is generated by active transport of mineral ions into the xylem sap, creating a concentration gradient that draws water in osmotically. This is distinct from transpiration pull and is a key concept in plant physiology.

A car accelerates from rest at 2 m/s². How long does it take to reach 20 m/s?

The correct answer is B: 10 seconds. **This problem uses the kinematic equation relating velocity, acceleration, and time for motion starting from rest.** **Step 1: Identify the Given Values** We are given the initial velocity (starting from rest), final velocity, and acceleration. We need to find the time taken. $$v_i = 0 \text{ m/s},

A car moving at 72 km/h applies brakes and comes to rest in 8 seconds. What is the deceleration?

The correct answer is A: 2.5 m/s². First convert 72 km/h = 20 m/s. Using v = u + at: 0 = 20 + a(8), so a = -20/8 = -2.5 m/s². Magnitude of deceleration is 2.5 m/s².

When a spring is compressed by 0.1 m, the elastic potential energy stored is 5 J. What is the spring constant?

The correct answer is B: 1000 N/m. Elastic potential energy E = (1/2)kx². 5 = (1/2)k(0.1)². 5 = 0.005k. k = 1000 N/m.

The phenomenon of leaf fall in deciduous plants before winter is regulated by which hormone?

The correct answer is A: Abscisic acid. Abscisic acid (ABA) accumulates during water stress and environmental changes, promoting abscission layer formation and leaf fall.

Home

Home › Subjects › General Science

General Science

Physics, Chemistry, Biology and more

74 Q 8 Topics Take Mock Test

Difficulty: All Easy Medium Hard 71–74 of 74

Topics in General Science

All Physics 106 Chemistry 9 Biology 2 Botany 78 Human Body 4 Disease & Health 2 Space & Astronomy 5 Environment 1

Q.71 Easy Human Body

Organ that pumps blood?

A Liver

B Kidney

C Heart

D Lungs

Correct Answer: C. Heart

EXPLANATION

Heart pumps blood.

Test

Q.72 Easy Chemistry

Chemical formula of water?

A HO

B H2O

C H2O2

D HO2

Correct Answer: B. H2O

EXPLANATION

Water = H₂O.

Test

Q.73 Easy Space & Astronomy Space Science

Which celestial phenomenon occurs when the Moon passes between the Earth and the Sun, blocking the Sun's light and casting a shadow on Earth?

A Solar Eclipse

B Lunar Eclipse

C Penumbral Eclipse

D Annular Eclipse

Correct Answer: A. Solar Eclipse

EXPLANATION

A solar eclipse happens when the Moon's orbit places it directly between Earth and the Sun, creating a shadow on Earth's surface.

This is distinct from a lunar eclipse where Earth blocks sunlight from reaching the Moon, and from penumbral or annular eclipses which are specific types with different characteristics.

Test

Q.74 Easy Chemistry

Which of the following elements has the highest electronegativity value on the Pauling scale?

A Fluorine

B Oxygen

C Chlorine

D Nitrogen

Correct Answer: A. Fluorine

EXPLANATION

Fluorine has the highest electronegativity value of 3.98 on the Pauling scale, making it the most electronegative element.

This is because it has the smallest atomic radius and the highest effective nuclear charge among all elements, causing it to attract electrons most strongly in a chemical bond.

Test

1…6 7 8

All Subjects & Topics

Govt. Exams

Entrance Exams

Teacher Exams

Subjects

Quick Links

General Science