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MBBS QUESTION #10285

Accommodation of the eye for near vision involves parasympathetically-mediated contraction of the ciliary muscle. This causes which change, allowing the eye to focus on nearby objects?

The lens flattens and becomes thinner, reducing its refractive power
Ciliary muscle contraction relaxes tension on the zonular (suspensory) fibers, allowing the elastic lens to become more spherical/convex and increase its refractive power✔️
The pupil dilates maximally, with no change in lens shape
Corneal curvature alone increases, with the lens remaining unchanged

Correct Answer Logic:

Parasympathetic stimulation contracts the ciliary muscle, which reduces tension on the zonular fibers suspending the lens; the inherently elastic lens then becomes more rounded (convex), increasing its refractive power to focus on near objects — a process that weakens with age (presbyopia) as the lens loses elasticity.

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English QUESTION #2733

Question 6702

Which sentence is in the PASSIVE VOICE?

She cleaned the room.
He is writing a letter.
The book was written by him.✔️
They will finish the work.

Correct Answer Logic:

Passive voice uses 'be + past participle'. 'The book was written by him' has 'was written' (was + past participle)

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Physics QUESTION #1041

Question 6703

De-Broglie wavelength of an electron in $n=2$ state of hydrogen atom is close to (Bohr radius $= 0.052\ \text{nm}$):

1.67 nm
2.67 nm
0.067 nm
0.67 nm✔️

Correct Answer Logic:

In Bohr model: $2\pi r_n = n\lambda$. For $n=2$: $r_2 = 4r_0 = 4\times0.052 = 0.208\ \text{nm}$. $\lambda = \frac{2\pi r_2}{2} = \pi r_2 = \pi\times0.208\times10^{-9}\approx0.653\ \text{nm}\approx0.67\ \text{nm}$.

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Physics QUESTION #7320

Question 6704

A stone in free fall covers distances $h_1$, $h_2$, $h_3$ in successive 5-second intervals. The correct relation is:

$h_1 = h_2 = h_3$
$h_1 = 2h_2 = 3h_3$
$h_1 : h_2 : h_3 = 1 : 3 : 5$✔️
$h_2 = 3h_1$ and $h_3 = 3h_2$

Correct Answer Logic:

Distances in successive equal time intervals from rest are in the ratio of odd numbers: $1:3:5:7\ldots$

So $h_1 : h_2 : h_3 = 1 : 3 : 5$, i.e., $\mathbf{h_1 = \dfrac{h_2}{3} = \dfrac{h_3}{5}}$

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Psychology QUESTION #11356

Question 6705

The term 'phenomenology' refers to:

the science of perception
a detailed analysis of our sensations
the scientific study of odd occurrences
a 'naive' description of our recent experiences✔️

Correct Answer Logic:

Phenomenology refers to a 'naive' description of our recent experiences.

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Chemistry QUESTION #4359

Question 6706

The order of ease of reduction of $H^{+1}$, $Cu^{+2}$, and $Ag^{+1}$:

$H^{+1} > Cu^{+2} > Ag^{+1}$
$H^{+1} > Ag^{+1} > Cu^{+2}$
$Ag^{+1} > Cu^{+2} > H^{+1}$✔️
$H^{+1} > Cu^{+2} = Ag^{+1}$

Correct Answer Logic:

Ease of reduction follows the standard reduction potential (SRP): $Ag^{+}/Ag = +0.80\ V$, $Cu^{2+}/Cu = +0.34\ V$, $H^{+}/H_2 = 0.00\ V$. Higher SRP = easier to reduce. Order: $Ag^{+1} > Cu^{+2} > H^{+1}$.

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Tourism & Hospitality Management QUESTION #1600

Question 6707

According to the Cultural Tourism course, the 'International Cultural Tourism Charter' primarily serves which purpose in the management of heritage tourism?

To set hotel star-rating standards for heritage destinations
To provide a guiding framework of principles for managing the relationship between tourism and cultural heritage sites responsibly✔️
To regulate the pricing of entry tickets to UNESCO World Heritage Sites
To establish immigration rules for cultural tourists

Correct Answer Logic:

The International Cultural Tourism Charter (ICOMOS) is covered in Module 1 of the Cultural Tourism course as a foundational guiding document that establishes principles for responsibly managing the interaction between tourism and cultural heritage — balancing conservation with access and interpretation.

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English QUESTION #8338

Question 6708

We must respect the views of our _______ in this matter, even though we cannot agree with them.

enemies
foes
opponents✔️
adversaries

Correct Answer Logic:

'Opponents' is neutral and appropriate for disagreement.

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Boilers Mechanical Engineering QUESTION #4008

Question 6709

In an 'Oil-Fired' boiler, 'Atomization' of the fuel is necessary to:

Make the fuel smell better
Increase the surface area of the fuel for rapid and complete combustion✔️
Cool the fuel down
Change the color of the flame

Correct Answer Logic:

Turning liquid oil into a fine mist allows it to mix thoroughly with air.

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Accounting & Finance QUESTION #1228

Question 6710

The discount rate at which two projects have identical _________ is referred to as Fisher's rate of intersection.

Present values
Net present values✔️
IRRs
Profitability indexes

Correct Answer Logic:

Fisher's rate of intersection (or Fisher's rate) is the discount rate at which the NPVs of two mutually exclusive projects are equal — the crossover rate. At this rate, both projects have identical Net Present Values. Below this rate, one project is preferred; above it, the other is preferred. It is used to resolve conflicts between NPV and IRR rankings.

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Math Physics Chemistry Biology QUESTION #11274

Question 6711

Fertilization in humans normally occurs in the:

Ovary
Uterus
Fallopian tube (oviduct)✔️
Vagina

Correct Answer Logic:

Fertilization typically occurs in the ampulla (widest part) of the fallopian tube. The fertilized zygote then travels to the uterus over 3-4 days and implants in the endometrium about 6-7 days after fertilization.

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Physics QUESTION #7036

Question 6712

The density of a cube is calculated by measuring its mass and the length of its sides. If the relative error in mass is $1.5\%$ and in length is $1\%$, determine the maximum percentage error in the density.

$4.5\%$✔️
$6\%$
$2.5\%$
$3.5\%$

Correct Answer Logic:

Density ($\rho$) is given by: $\rho = \frac{M}{L^3}$

The relative error formula for density is:

$\frac{\Delta \rho}{\rho} \times 100 = \frac{\Delta M}{M} \times 100 + 3 \left( \frac{\Delta L}{L} \times 100 \right)$

Substitute the given values:

$\text{Max Error} = 1.5\% + 3(1\%) = 4.5\%$

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Dairy Food Science and Technology QUESTION #5872

Question 6713

UHT processing of milk typically involves heating at:

$72^{\circ}\text{C}$ for $15$ seconds
$85^{\circ}\text{C}$ for $30$ minutes
$135\text{–}150^{\circ}\text{C}$ for $2\text{–}5$ seconds✔️
$121^{\circ}\text{C}$ for $15$ minutes

Correct Answer Logic:

UHT processing uses temperatures of $135\text{–}150^{\circ}\text{C}$ for $2\text{–}5$ seconds. This achieves commercial sterility while minimizing heat damage to nutrients and flavor compared to in-bottle sterilization.

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General Ability and Fire Fighting QUESTION #5621

Question 6714

Which class of fire involves cooking oils and fats in a commercial kitchen?

Class A
Class B
Class D
Class K✔️

Correct Answer Logic:

Class K fires involve cooking oils and fats. The 'K' classification was created specifically for the high-temperature grease fires common in commercial kitchens.

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MBBS QUESTION #10341

Question 6715

Endergonic biochemical reactions, which require a net input of free energy to proceed, are frequently made favorable within cells by coupling them to which highly exergonic reaction?

Hydrolysis of ATP to ADP and inorganic phosphate✔️
Synthesis of ATP from ADP and inorganic phosphate
Simple diffusion of ions down their electrochemical gradient, unrelated to ATP
Denaturation of cellular proteins

Correct Answer Logic:

Cells commonly couple an otherwise unfavorable (endergonic) reaction to the highly exergonic hydrolysis of ATP, making the combined (coupled) reaction thermodynamically favorable overall — the fundamental energetic strategy underlying most biosynthetic and active transport processes.

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Accounting Finance and Punjab Sales Tax on Services QUESTION #2579

Question 6716

According to Entry No. 19 of the Offences and Penalties Schedule, where a person fails to declare or conceals any business bank account, or fails to intimate any change in business bank account within fourteen days, the range of penalty is:

Twenty-five thousand to fifty thousand rupees
Fifty thousand to two hundred thousand rupees
One hundred thousand to five hundred thousand rupees✔️
Five hundred thousand to one million rupees

Correct Answer Logic:

Entry No. 19 provides that where any person fails to declare, conceals any business bank account or gives misleading declaration or fails to intimate any change within fourteen days, such person shall be liable to a penalty ranging from ONE HUNDRED THOUSAND TO FIVE HUNDRED THOUSAND RUPEES.

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General Knowledge QUESTION #8851

Question 6717

During an uphill journey, a person bends forward to maintain:

High Speed
Stability✔️
Avoiding fatigue
Avoiding beasts

Correct Answer Logic:

Leaning forward helps maintain stability against gravity.

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General Knowledge QUESTION #8915

Question 6718

Compressed Natural Gas (CNG) has the same chemical composition as:

LPG (liquefied petroleum gas)
Sui Gas (natural gas)✔️
Tear gas
Poison gas

Correct Answer Logic:

CNG is compressed natural gas (mainly methane), same as Sui gas.

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Math Physics Chemistry Biology QUESTION #7749

Question 6719

Sharks belong to which class of vertebrates?

Chondrichthyes✔️
Echinodermata
Osteichthyes
Urochordata

Correct Answer Logic:

Class Chondrichthyes includes cartilaginous fish (sharks, rays). Osteichthyes are bony fish. Echinodermata are starfish etc.; Urochordata are tunicates.

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Physics QUESTION #7070

Question 6720

An ideal gas is contained in an isolated closed chamber. During an adiabatic expansion, the average time between molecular collisions increases as $V^q$, where $V$ is the volume. Determine the value of $q$ in terms of $\gamma = C_p/C_v$.

$\frac{3\gamma+5}{6}$
$\frac{3\gamma-5}{6}$
$\frac{\gamma+1}{2}$✔️
$\frac{\gamma-1}{2}$

Correct Answer Logic:

Average time between collisions $\tau$ is given by $\tau = \frac{\lambda}{v_{rms}}$, where $\lambda$ is the mean free path.

1. $\lambda \propto \frac{1}{n} \propto V$ (where $n$ is number density).
2. $v_{rms} \propto \sqrt{T}$.
3. For an adiabatic process, $TV^{\gamma-1} = \text{constant}$, so $T \propto V^{1-\gamma}$ and $\sqrt{T} \propto V^{\frac{1-\gamma}{2}}$.

Therefore, $\tau \propto \frac{V}{V^{\frac{1-\gamma}{2}}} = V^{1 - \frac{1-\gamma}{2}} = V^{\frac{2-1+\gamma}{2}} = V^{\frac{\gamma+1}{2}}$.
Hence, $q = \frac{\gamma+1}{2}$.

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