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#7863 Medium Sindh University Past Papers and Syllabus SINDH UNIVERSITY PAST PAPERS AND SYLLABUS

The unit of frequency is _____?

The unit of frequency is _____?

A

Hertz

B

Metre

C

Meter Per Second

D

None of these

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The correct answer is A.

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Explanation The hertz is the unit of frequency  of one cycle per second.   symbol: hertz (Hz) Hertz in honor of the German physicist Heinrich Hertz hertz in the International System of Units (SI) frequency i s defined as one cycle per second ***

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#7879 Medium Sindh University Past Papers and Syllabus SINDH UNIVERSITY PAST PAPERS AND SYLLABUS

Change the voice: “Strike off his name.”

Change the voice: “Strike off his name.”

A

Let his name be struck off.

B

Let his name struck.

C

His name will be sticking off.

D

None of these

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The correct answer is A.

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Explanation Imperative sentence → passive voice starts with " Let " Base verb " strike off " → past participle is " struck off " Structure : Let + object + be + past participle Correct passive voice: Let his name be struck off.

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#7864 Medium Sindh University Past Papers and Syllabus SINDH UNIVERSITY PAST PAPERS AND SYLLABUS

Very small and very large quantities are expressed in ______?

Very small and very large quantities are expressed in ______?

A

Significant figure

B

Exponential notation

C

Rounding of data

D

None of these

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The correct answer is A.

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Explanation Exponential notation (scientific notation) is used to express very small (e.g., 0.0000001) or very large (e.g., 1000000000) quantities compactly by representing numbers as powers of 10 . Key Information : Format : a × 10^n, where 1 ≤ a < 10 and n is an integer. Used for very large or very small numbers . Examples: Large number : 6.022 × 10^23 ( Avogadro's number ) Small number : 1.6 × 10^-19 ( Charge of an electron )

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#7865 Medium Sindh University Past Papers and Syllabus SINDH UNIVERSITY PAST PAPERS AND SYLLABUS

Who invented Radio?

Who invented Radio?

A

Graham Bell

B

Thomas Edison

C

Marconi

D

Wright Brothers

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The correct answer is A.

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Explanation Marconi  invented  Radio . Radio was invented in  1895 . Guglielmo Marconi was an  Italian  inventor.  *****

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#7866 Medium Sindh University Past Papers and Syllabus SINDH UNIVERSITY PAST PAPERS AND SYLLABUS

The unit of amount of substance in SI system is _____?

The unit of amount of substance in SI system is _____?

A

Liter (L)

B

Mole (mol)

C

Gram (g)

D

Kilogram (Kg)

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The correct answer is A.

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Explanation The Mole (mol) is the SI unit of amount of substance, representing 6.022 x 10^23 particles. It is used to measure the amount of a substance in a sample.

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#7867 Medium Sindh University Past Papers and Syllabus SINDH UNIVERSITY PAST PAPERS AND SYLLABUS

Louis Pasteur was a ______?

Louis Pasteur was a ______?

A

Microbiologist

B

Chemist

C

Both A and B

D

Physicist

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The correct answer is A.

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Explanation Louis Pasteur (1822–1895) was a pioneering microbiologist and chemist whose work bridged both fields: As a Chemist : Discovered molecular chirality (optical isomers). Studied fermentation, proving it was caused by microorganisms. As a Microbiologist : Developed pasteurization (heat treatment to kill microbes in food). Created vaccines for rabies and anthrax. Disproved spontaneous generation (germ theory of disease).

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#7868 Medium Sindh University Past Papers and Syllabus SINDH UNIVERSITY PAST PAPERS AND SYLLABUS

CH3COOH is a formula of _____?

CH3COOH is a formula of _____?

A

Acetic acid

B

Sulfuric acid

C

Nitric acid

D

None of these

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The correct answer is A.

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Explanation The chemical formula CH₃COOH represents acetic acid , a weak organic acid commonly found in vinegar. Key Information : Common Name : Acetic acid (systematic name: ethanoic acid). Properties : Weak acid (partially dissociates in water). Pungent smell, sour taste (vinegar contains ~4–8% acetic acid).

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#7869 Medium Sindh University Past Papers and Syllabus SINDH UNIVERSITY PAST PAPERS AND SYLLABUS

Xylem and Phloem are the ______ ?

Xylem and Phloem are the ______ ?

A

Conducting tissues

B

Growth tissues

C

Both A and B

D

None of these

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The correct answer is A.

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Explanation Xylem and Phloem are specialized conducting tissues in vascular plants: Xylem : Transports water and minerals from roots to other parts (unidirectional). Phloem : Transports sugars (photosynthates) from leaves to other parts (bidirectional).

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#7870 Medium Sindh University Past Papers and Syllabus SINDH UNIVERSITY PAST PAPERS AND SYLLABUS

Atomic weight of Mercury (Hg) is ____ ?

Atomic weight of Mercury (Hg) is ____ ?

A

300.59 u

B

100.59 u

C

200.59 u

D

None of these

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The correct answer is A.

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Explanation The atomic weight of Mercury (Hg) is 200.59 unified atomic mass units (u), as listed on the periodic table. Key Information : Symbol : Hg (from Latin Hydrargyrum) Atomic Number : 80 Standard Atomic Weight : 200.592 u (often rounded to 200.59 u).

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#7871 Medium Sindh University Past Papers and Syllabus SINDH UNIVERSITY PAST PAPERS AND SYLLABUS

Mass of Earth is _____?

Mass of Earth is _____?

A

6.0 x 10^23 kg

B

6.0 x 10^24 kg

C

6.0 ´ 10^25 kg

D

6.0 ´ 10^26 kg

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The correct answer is A.

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Explanation The mass of Earth is approximately 6.0 x 10^24 kilograms ( 5.98 x 10^24 kg ). This is a widely accepted scientific value , based on various measurements and calculations, including: Gravity measurements Satellite orbits Seismological data Planetary formation models