Most Repeated GK MCQs from Past Papers MCQs with Answers & Explanations (Page 118)

Explanation I am indebted to you for your help میں آپ کی مدد کے لیے آپ کا مقروض ہوں۔ In the sentence the word "to" is used as a preposition to indicate the recipient of the indebtedness.

Explanation The central layer is made very thin and lightly doped as compared with the two outer layers and is called the base. The outer sections are called emitter and collector.

Explanation Remember that water has 2 lone pairs on oxygen. Hence, according to VSEPR theory, the water molecule arrives at a bent or a V-shape Due to the presence of lone pair-lone pair , lone pair-bond pair and bond pair-bond pair repulsions

Explanation The molality (m) of a solution is the moles of solute divided by the kilograms of solvent. A solution that contains 1.0mol of NaCl dissolved into 1.0kg of water is a "one-molal" solution of sodium chloride. The symbol for molality is a lower-case m written in italics.

Explanation A black body is both an ideal absorber and an ideal radiator of radiation. It absorbs all incident radiation perfectly and emits radiation at the maximum possible rate for any given temperature.

Explanation Methane molecule is sp3 hybridized and has a perfec t tetrahedral geometry

Explanation Bulk modulus of elasticity is defined as ratio of hydraulic stress to the corresponding the volumetric strain within the elastic limit. Bulk modulus K= FVAΔV=Δp⋅VΔV.

Explanation Light glare can be reduced by the process of polarization . Polarization is a process that involves filtering out light waves that are oscillating in certain directions. Glare occurs when light waves from a source, such as the sun or a bright artificial light, are scattered in various directions, leading to a harsh and uncomfortable brightness.

Explanation The current produced in a coil due to electromagnetic induction is called an induced current. The induced current can be positive or negative depending on the direction of the change in magnetic flux and the orientation of the coil However, the term " induced current " is used to refer to the current that flows As a result of electromagnetic induction, regardless of its direction being positive or negative

Explanation Bremsstrahlung or braking radiation is an example of a continuous spectrum. The spectrum of Bremsstrahlung radiatio n is continuous Because the energy of the emitted photons can vary continuously depending on the degree of deceleration of the charged particles. This leads to a continuous range of wavelengths or frequencies in the emitted radiation, forming a continuous spectrum. Bremsstrahlung radiation is commonly encountered in X-ray tubes Where high-energy electrons are decelerated by a target material Producing X-rays with a continuous spectrum of energies

Explanation Compression is a region in l ongitudinal waves that occurs in high pressure and rarefaction is also a region in longitudinal waves That occurs where there is extra space or where particles are far away from each other Both waves are longitudinal waves of sound waves

Explanation In a series RLC circuit, when the value of inductive reactance (XL) is equal to (XC) it is the condition of series resonance. Under such conditions, the impedance of the circuit is minimum and equal to the value of resistance (R). Since the resistance is minimum . So, the value of the current at resonance is maximum.

Explanation Electrons typically have greater kinetic energy compared to protons and neutrons because of thei r significantly lower mass.

Explanation Indicate high-frequency electromagnetic waves: Adiabatic Process: An adiabatic process is one in which there is no heat exchange with the surroundings. When a tire bursts suddenly, the air inside the tire expands rapidly without any heat transfer to or from the surroundings. This rapid expansion without heat exchange is characteristic of an adiabatic process. Expansion: The bursting of the tire leads to a sudden increase in volume, which is an expansion process.

Explanation if the phase of vibration Θ = π/ z radians , and you are saying that a quarter of the cycle is completed Then we can equate these two conditions to find the value of z. In Simple Harmonic Motion (SHM), one complete cycle corresponds to 2π radians. Therefore, if Θ = π/ z radian represented a quarter of the cycle, then we can write: Θ = π/ z = 1/ 4 x 2 π simplifying π/ z = π/ 2 Now, to find the value of z, w e can cross-multiply z = 2 So, when the phase of vibration Θ = π/ z radians and a quarter of the cycle is completed , the value of z is 2.

Explanation To find the resultant magnitude of two forces acting at right angles (90°), use the Pythagoras' theorem: Resultant (R) = √(F₁² + F₂²) Given: - F₁ = 6 N - F₂ = 8 N R = √(6² + 8²) = √(36 + 64) = √100 = 10 N

Explanation To determine the fraction of the pizza that remains after 4 slices are eaten from a pizza divided into 10 equal slices, we can follow these steps: 1. Total slices in the pizza: 10 equal slices 2. Slices eaten: 4 slices 3. Slices remaining: Subtract the slices eaten from the total slices to find the slices that remain: 10 - 4 = 6 4. Fraction of the pizza remaining: The fraction of the pizza that remains after 4 slices are eaten out of 10 slices can be calculated as: slices remaining / total slices = 6/10 = 3/5

Explanation The range of a data set is defined as the difference between the maximum and minimum values in the data set. It provides a measure of the spread or variability of the data.

Explanation Given the information that the sum of two numbers is 35 and one number is 8 more than the other, we can set up a system of equations to solve for the numbers. Let's denote the two numbers as and , where: = one of the numbers = the other number Given : 1. The sum of the two numbers is 35: x + y = 35 2. One number is 8 more than the other : x = y + 8 Substitute the value of from the second equation into the first equation: y + y + 8 = 35 2y + 8 = 35 2y + 8 = 35 2y = 27 y = 13.5 Now, substitute the value of y back into: x = y +8 x = 13.5 + 8 x = 21.5

Explanation Given : Total pages in the book = 300 Total days to finish the book = 10 Calculate the number of pages the student should read per day: 300 pages / 10 days = 30 pages per day