Question # 1

Right atrium receives.

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Oxgynated blood

Deoxygenated blood

BOth types of blood

no blood

Dolphins can hear sound underwater from up to ............ away

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15 km

20 km

25 km

30 km

The particles of an element having different mass numbers.

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Proton

Neutrons

Isotopes

Atoms

The mass of an atom is almost due to the.

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Electron

Proton

Nucleus

Neutrons

The products of respiration are carbon dioxide and.

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Water

Oxygen

Mitochondria

Chloroplast

The part of the heart which receives blood from lungs.

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Left atrium

Right atrium

Left ventricle

Right ventricle

Which of the following features of a wave is the number of waves that pass by each second.

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Loudness

Amplitude

Frequency

Wave speed

The negetively charged particle arod nucleus are called.

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Electron

Proton

Atom

Neutron

Chlorophyll is present in.

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Mesophyll cells

Upper epidermis

Lower epidermis

Endodermis

------------ waves are produced in stretched string.

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Longitudinal wave

Elecromagnetic wave

Transverse wave

None of these

An element with fifteen protons in its atomic nucleus has atomic numebr.

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5

10

15

20

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