The NDST (National Defense Science and Technology) exam is designed to assess students’ knowledge in various subjects. This guide offers a comprehensive collection of questions and answers across all subjects covered in the NDST exam, helping students prepare effectively by understanding the type of questions that appear in the exam.

**NDST Question Paper and Answers**

**Question**

What is the acceleration due to gravity on Earth?

**Answer**

The acceleration is $9.8m/s_{2}$.

**Question**

State Newton’s third law of motion.

**Answer**

For every action, there is an equal and opposite reaction.

**Question**

What is the formula for calculating force?

**Answer**

Force is calculated as $F=ma$, where $m$ is mass and $a$ is acceleration.

**Question**

What is the unit of electrical resistance?

**Answer**

The unit is Ohm (Î©).

**Question**

Define kinetic energy.

**Answer**

Kinetic energy is the energy of an object due to its motion.

**Question**

What is the speed of light in a vacuum?

**Answer**

The speed of light is $3Ã—1_{8}m/s$.

**Question**

How does the pressure of a gas change with temperature?

**Answer**

The pressure increases as the temperature increases, provided the volume is constant.

**Question**

State the law of conservation of energy.

**Answer**

Energy cannot be created or destroyed; it can only be transformed from one form to another.

**Question**

What is the relationship between wavelength and frequency?

**Answer**

Wavelength and frequency are inversely proportional to each other.

**Question**

Define momentum.

**Answer**

Momentum is the product of an object’s mass and its velocity.

**Question**

What is the formula for potential energy?

**Answer**

Potential energy is $PE=mgh$, where $m$ is mass, $g$ is gravitational acceleration, and $h$ is height.

**Question**

What is Ohm’s law?

**Answer**

Ohm’s law states that $V=IR$, where $V$ is voltage, $I$ is current, and $R$ is resistance.

**Question**

What happens when light passes through a prism?

**Answer**

The light is dispersed into its constituent colors, forming a spectrum.

**Question**

What is the first law of thermodynamics?

**Answer**

The first law states that the total energy in a system is conserved.

**Question**

How is pressure related to force and area?

**Answer**

Pressure is force divided by area: $P=AFâ€‹$.

**Question**

What is the unit of power?

**Answer**

The unit of power is Watt (W).

**Question**

What is the Doppler effect?

**Answer**

The Doppler effect is the change in frequency of a wave in relation to an observer moving relative to the source of the wave.

**Question**

What is refraction?

**Answer**

Refraction is the bending of light as it passes from one medium to another with a different density.

**Question**

What is the SI unit of energy?

**Answer**

The SI unit of energy is the joule (J).

**Question**

What is a black hole?

**Answer**

A black hole is a region of space where the gravitational pull is so strong that nothing, not even light, can escape from it.

**Chemistry**

**Question**

What is the atomic number of carbon?

**Answer**

The atomic number of carbon is 6.

**Question**

Define a covalent bond.

**Answer**

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.

**Question**

What is the chemical formula for water?

**Answer**

The chemical formula for water is $H_{2}O$.

**Question**

What is the pH of a neutral solution?

**Answer**

The pH of a neutral solution is 7.

**Question**

What is the periodic table?

**Answer**

The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties.

**Question**

Define an acid.

**Answer**

An acid is a substance that donates protons (H+ ions) and has a pH of less than 7.

**Question**

What is the molecular weight of sulfuric acid?

**Answer**

The molecular weight of sulfuric acid (H2SO4) is 98 g/mol.

**Question**

What is a catalyst?

**Answer**

A catalyst is a substance that speeds up a chemical reaction without being consumed.

**Question**

State the law of conservation of mass.

**Answer**

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction.

**Question**

What is the valency of oxygen?

**Answer**

The valency of oxygen is 2.

**Question**

What are noble gases?

**Answer**

Noble gases are inert elements in group 18 of the periodic table, such as helium, neon, and argon.

**Question**

What is an isotope?

**Answer**

An isotope is an atom of the same element with the same number of protons but a different number of neutrons.

**Question**

What is the chemical formula for sodium chloride?

**Answer**

The chemical formula for sodium chloride is $NaCl$.

**Question**

What is an electrolyte?

**Answer**

An electrolyte is a substance that produces ions when dissolved in water, allowing the solution to conduct electricity.

**Question**

What is a base?

**Answer**

A base is a substance that accepts protons (H+ ions) and has a pH greater than 7.

**Question**

What is the empirical formula?

**Answer**

The empirical formula is the simplest whole-number ratio of atoms in a compound.

**Question**

What is Avogadro’s number?

**Answer**

Avogadro’s number is $6.022Ã—1_{23}$, the number of atoms or molecules in one mole of a substance.

**Question**

What is the molar mass of carbon dioxide?

**Answer**

The molar mass of carbon dioxide (CO2) is 44 g/mol.

**Question**

What is the common name for $CH_{4}$?

**Answer**

The common name for $CH_{4}$ is methane.

**Question**

What is the process of electrolysis?

**Answer**

Electrolysis is the process of using an electric current to drive a non-spontaneous chemical reaction.

**Mathematics**

**Question**

What is the value of $x$ if $2x+3=11$?

**Answer**

The value of $x$ is $4$.

**Question**

If the area of a circle is 154 square units, what is the radius?

**Answer**

The radius is 7 units.

**Question**

Simplify $(x_{2}+2xâˆ’3)Ã·(xâˆ’1)$.

**Answer**

The simplified form is $x+3$.

**Question**

Find the derivative of $f(x)=3x_{2}+5x$.

**Answer**

The derivative is $f_{â€²}(x)=6x+5$.

**Question**

If the sum of three consecutive numbers is 72, what are the numbers?

**Answer**

The numbers are 23, 24, and 25.

**Question**

Solve $3x_{2}âˆ’12x+9=0$.

**Answer**

The solutions are $x=1$.

**Question**

What is the volume of a cube with side length 4 units?

**Answer**

The volume is 64 cubic units.

**Question**

Find the integral of $âˆ«5x_{3}dx$.

**Answer**

The integral is $4xâ€‹+C$.

**Question**

Solve for $y$ in $2y+5=17$.

**Answer**

$y=6$.

**Question**

What is the slope of a line passing through the points (2, 3) and (4, 7)?

**Answer**

The slope is $2$.

**Question**

Find the area of a triangle with base 10 units and height 8 units.

**Answer**

The area is 40 square units.

**Question**

If $a=5$ and $b=12$, what is the hypotenuse of the triangle?

**Answer**

The hypotenuse is 13 units.

**Question**

Simplify $(x+)(xâˆ’)â€‹$.

**Answer**

The simplified form is $xâˆ’1$.

**Question**

What is the solution to $5x+3=2x+15$?

**Answer**

$x=4$.

**Question**

Find the probability of rolling a 4 on a standard die.

**Answer**

The probability is $61â€‹$.

**Question**

Solve $2x+3y=6$ for $y$.

**Answer**

$y=3âˆ’xâ€‹$.

**Question**

What is the midpoint of the line segment connecting (3, 7) and (9, 11)?

**Answer**

The midpoint is $(6,9)$.

**Question**

Evaluate the determinant of the matrix $[13â€‹24â€‹]$.

**Answer**

The determinant is $âˆ’2$.

**Question**

What is the sum of the first 20 terms of the arithmetic sequence 2, 4, 6, 8…?

**Answer**

The sum is 420.

**Question**

If $f(x)=2x_{2}+3x$, find $f(2)$.

**Answer**

$f(2)=14$.

Studying the NDST question papers can help students develop a better understanding of the subjects and improve their exam performance. The comprehensive questions and answers provided here cover all key areas that are essential for success in the NDST exam, making it easier to prepare effectively

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