Matter and its Nature NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Matter and its Nature MCQ Questions


7.
An electron is accelerated through a potential difference of 10,000 V. Its de-Broglie wavelength is approximately:

NEET - 2020

A.
12.2 × 10⁻¹² m
B.
12.2 × 10⁻¹⁴ m
C.
12.2 nm
D.
12.2 × 10⁻¹³ m
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ANSWER :
A. 12.2 × 10⁻¹² m
8.
Which of the following is a pure substance?
A.
Air
B.
Bronze
C.
Milk
D.
Water
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ANSWER :
D. Water
9.
Which state of matter has a definite shape and definite volume?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
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ANSWER :
A. Solid
10.
An electron with initial velocity enters a uniform electric field E₀. If λ₀ is the initial de-Broglie wavelength, its wavelength at time t is:

NEET - 2016

A.
λ₀ / (1 + eE₀t/mv₀)
B.
λ₀
C.
λ₀ (1 + eE₀t/mv₀)
D.
λ₀ / (1 - eE₀t/mv₀)
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ANSWER :
A. λ₀ / (1 + eE₀t/mv₀)
11.
Which type of change does not alter the chemical composition of a substance?
A.
Physical change
B.
Chemical change
C.
Nuclear change
D.
Atomic change
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ANSWER :
A. Physical change
12.
Which of the following is an example of a chemical change?
A.
Melting of ice
B.
Rusting of iron
C.
Breaking of glass
D.
Evaporation of alcohol
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ANSWER :
B. Rusting of iron