IBA STS MDCAT Past Paper 08-12-2024

Q121: Viruses are called non-cellular infectious entities because _______?

وائرس کو غیر سیلولر متعدی ہستی کہا جاتا ہے کیونکہ _______؟

They are pathogens and cause infections

They cause infections, and can only replicate inside living cells

They can replicate inside as well as outside the living cells

None of these

Q122: Identify the tense of the given sentence: The sick child has been sleeping for three hours.

Past Perfect Tense

Present Perfect Tense

Present Perfect Continous Tense

None of these

Q123: The fireman took several hours to "put out" the fire. The word out out means?

Extinguish

Produce

Broadcast

None of these

Q124: Since she believed _ her abilities, she didn't ask _ any help.

An, For

At, For

In, For

None of these

Q125: A battery is charging with an EMF of 12 V, internal resistance of 20 Ω, and current of 0.1 A. What is the terminal potential difference?

14 V

10 V

12 V

None of these

Explanation

Terminal potential difference (V) during charging is given by $V = E + Ir$ , where $E$ is EMF, $I$ is current, and $r$ is internal resistance.

Substituting values:

V = 12 + (0.1 times 20) = 12 + 2 = 14 , text{V}.

Q126: Speed of sound is maximum in ______?

آواز کی رفتار ______ میں زیادہ سے زیادہ ہے؟

Air

Water

Copper

None of these

Q127: Ethyl alcohol reacts with SOCl₂ to form?

Ethyl chloride

Ethyl bromide

Ethyl acetate

None of these

Explanation

Ethyl alcohol ( $C_2H_5OH$ ) reacts with thionyl chloride ( $SOCl_2$ ) to produce ethyl chloride ( $C_2H_5Cl$ ) along with $SO_2$ and $HCl$ as by-products.

This reaction is commonly used for converting alcohols into alkyl chlorides.

Q128: In the Haber's process, hydrogen gas and nitrogen gas are mixed in the ratio of ______ according to volume?

ہیبر کے عمل میں، ہائیڈروجن گیس اور نائٹروجن گیس کو حجم کے مطابق ______ کے تناسب میں ملایا جاتا ہے؟

1:2

1:3

3:1

None of these

Explanation

In the Haber's process, the balanced chemical equation is $N_2 + 3H_2 rightarrow 2NH_3$

This indicates that 1 volume of nitrogen reacts with 3 volumes of hydrogen gas.

Q129: In diamond, each carbon atom is covalently bonded with four other carbon atoms at an angle of ______?

ہیرے میں، ہر کاربن ایٹم ______ کے زاویہ پر چار دیگر کاربن ایٹموں کے ساتھ ہم آہنگی سے جڑا ہوا ہے؟

90°

109.5°

120°

None of these

Q130: The oxygen transported through blood plasma is about _____?

خون کے پلازما کے ذریعے منتقل ہونے والی آکسیجن تقریباً _____ ہے؟

5%

1%

3%

None of these