Brain Blitz

What is a polynomial?

• An algebraic expression with only one term

• An algebraic expression with two terms

• An algebraic expression with one or more terms, where each term consists of variables and exponents.

• An algebraic expression with no terms

What is the degree of the polynomial 4x^3 + 2x^2 - x + 7?

• 3

• 2

• 1

• 0

Answer explanation

Degree is the highest power of the variable in an expression.

Which of the following is an example of uniform motion?

• A car accelerating from rest

• A ball falling freely under gravity

• A pendulum swinging back and forth

• A bicycle moving on a rough road

Answer explanation

Uniform motion refers to an object moving at a constant speed in a straight line without changing its direction. In the case of the pendulum, although it is swinging back and forth, its motion is periodic and repeats at a constant rate. The pendulum's speed remains constant throughout its motion, making it an example of uniform motion.

Select the sentence with a correct subject-verb agreement:

• The amount of money were not enough.

• The amount of money is not enough.

• The amount of money are not enough.

• The amount of money is not enoughs.

Answer explanation

In this sentence, the subject "amount of money" is singular, and the verb "is" agrees with it by also being singular.

A car starts from rest and accelerates uniformly at a rate of 4 m/s². How much time will it take for the car to reach a speed of 36 m/s?

• 6

• 9

• 12

• 10

Answer explanation

To solve this problem, we can use the formula of motion:

v=u+at

Where:

• v is the final velocity (36 m/s),

• u is the initial velocity (0 m/s since the car starts from rest),

• a is the acceleration (4 m/s²),

• t is the time we want to find.

An object is thrown vertically upwards with an initial velocity of 20 m/s. What is the maximum height reached by the object? (Neglect air resistance and take acceleration due to gravity as 10 m/s²)

• 40 Meter

• 80 Meter

• 120 Meter

• 100 Meter

Answer explanation

To find the distance covered by the car during this time, we can use the equation for distance covered during uniform acceleration:

d=ut+1/2at^2

Where:

• u is the initial velocity (0 m/s since the car starts from rest),

• a is the acceleration (2 m/s²),

• t is the time (10 seconds).

Which organelle contains the genetic material of a cell?

• Vacuole

• Nucleus

• Lysosome

• Mitochondria

Rationalize the denominator of the following expression: (√13 - √5) / (√13 + √5)

• (√13 + √5) / (√13 + √5)

• (√13 - √5) / (√13 - √5)

• 1

• 0

Which of the following is an example of a compound?

• Hydrogen gas (H2)

• Oxygen gas (O2)

• Water (H2O)

Which subatomic particle has a positive charge?

• Proton

• Electron

• Neutron

Answer explanation

Protons are positively charged particles found in the nucleus of an atom. They have a charge of +1 elementary charge. Neutrons, on the other hand, have no charge (neutral), and electrons have a negative charge.