IBA STS MDCAT Past Paper 08-12-2024

Q21: ATP is best defined as _____?

اے ٹی پی کی بہترین تعریف _____ کے طور پر کی جاتی ہے؟

The molecule that releases energy when the phosphate molecule is removed

The molecule that has no role in muscle contraction

The molecule that releases energy when phosphate molecule is added

None of these

Q22: Common characteristics of Hirudinaria are: 1. Setae & parapodia absent 2. Setae are present but parapodia absent 3. Blood suckers are present

1 & 3

1, 2 & 3

1 & 2

None of these

Q23: What is the heat transfer when internal energy decreases by 200 J and the work done by the system is 50 J?

100 J

50 J

150 J

None of these

Q24: A disulphide bridge is found in which biomolecule?

ایک ڈسلفائیڈ پل کس بایو مالیکیول میں پایا جاتا ہے؟

Protein

Enzyme

Carbohydrates

None of these

Q25: In which of the following combinations is the current maximum?

مندرجہ ذیل میں سے کون سے مجموعوں میں موجودہ زیادہ سے زیادہ ہے؟

Series

Parallel

Mixed combination

None of these

Q26: Grignard's reagent forms carboxylic acid when it reacts with?

گرگنارڈ کا ری ایجنٹ کاربو آکسیلک ایسڈ بناتا ہے جب اس کے ساتھ رد عمل ہوتا ہے؟

H₂O

CO₂

NH₃

None of these

Explanation

Grignard reagents (

R - M g X

) react with carbon dioxide to produce carboxylic acids after hydrolysis.

The reaction involves the nucleophilic addition of the Grignard reagent to CO₂.

It forming an intermediate carboxylate salt, which is then protonated to yield the carboxylic acid.

Q27: In circular motion, what is the direction of angular velocity and angular acceleration to each other?

سرکلر حرکت میں، کونیی رفتار اور کونیی سرعت ایک دوسرے کی سمت کیا ہے؟

Opposite

Perpendicular

Parallel

None of these

Q28: If a pendulum completes one cycle in half seconds, its frequency is ______?

اگر پینڈولم ایک چکر آدھے سیکنڈ میں مکمل کرتا ہے تو اس کی فریکوئنسی ______ ہے؟

2 Hz

3 Hz

4 Hz

None of these

Q29: The Magnetic quantum number for 4f orbital would be _____?

-3, -2, -1, 0, +1, +2, +3

-2, -3, -1, 0, +2, +3, +1

-3, -4, -2, -1, 0, +3, +2, +1

None of these

Explanation

The magnetic quantum number ( $m_l$ ) defines the orientation of orbitals and ranges from $-l$ to $+l$

For the 4f orbital, $l = 3$ , so $m_l$ values are -3, -2, -1, 0, +1, +2, +3.

Q30: Identify the correct spelling: Grievous, Grievious, Grieviyous, Grieviouss

Grievous

Grievious

Grieviyous

Grieviouss