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Physical Science:

Dr. Sunil Karna

Exercises 1.5 Exercise

1.

Arrange the planets in the order of their distance from the sun.
Answer.
Mercury, Venus, Earth, Mars, Jupyter, Satern, Uranus, and Naptune.

2.

What is the height of a person in centimeter, if he is 5’9" tall ?
Hint.
convert 5’ feet into inch and add them to the 9 inch to get total hight and then use conversion factor 1 inch = 2.54 cm.
Solution.
\(5 ft\cdot\frac{12 in}{1 ft}+9 in = 60 in+9in = 69 in= 175.26 cm\text{.}\)

3.

A meter stick is how much in milimeter (mm)?
Hint.
convert 1 m into cm and then use conversion factor 1 cm = 10 mm.

4.

Find the area of a piece of land in correct significant figures which has 25 m width and 221 m length.
Solution.
empty

5.

Perform the following calculations in correct significant digits.
  1. \(\displaystyle 12.52 m + 349.0 m - 8.24 m\)
  2. \(\displaystyle 8.3 m\times 2.22 m\)
  3. \(\displaystyle 8432 m \div 3 \)
  4. How many significant digits are in 90.009 mm
  5. How many significant digits are in 0.01520 kg
  6. Round the following numbers into given significant digits as shown in paranthesis:
    • 314.721 m (4)
    • 8792 km (2)
    • 0.001775 L (2)
Solution.
empty

6.

Answer these observations in your own understanding.
  1. Write a short note on constelation.
  2. Why do stars always look twinkling?
  3. Why does a star appear to rise 4 minute early in the sky every day?

7.

What is the unit of measurement for luminous intensity?
  1. Candela
  2. Newton
  3. Joule
  4. Pascal
Answer.
a.

8.

What is the SI unit for measuring mass?
  1. Kilogram
  2. Newton
  3. Joule
  4. Meter

9.

What is the conversion factor for converting meters to kilometer?
  1. 100
  2. 1000
  3. 10
  4. 0.1
Answer.
b.

10.

Why do stars appear to rise about 4 minutes earlier each night?
  1. Stars are actually moving closer to Earth.
  2. Earth’s orbit causes stars to shift their positions.
  3. Earth’s rotation causes the celestial object to appear earlier.
  4. Atmospheric refraction affects star visibility.
Answer.
c.
Solution.
The Sun takes about 24 hours to make a complete circle in the sky, while the stars complete a circle in the sky in 4 minutes less time. This causes the positions of the stars at a given time of day or night to change slightly each day.

11.

If a star rises at 9:00 PM tonight, approximately at what time will it rise tomorrow night?
  1. 8:56 PM
  2. 9:00 PM
  3. 9:04 PM
  4. 9:08 PM
Answer.
a.

12.

What are constellations?
  1. Patterns formed by stars in the sky as seen from Earth.
  2. Planets that orbit distant stars.
  3. Groups of comets that share similar orbits.
  4. Temporary phenomena caused by atmospheric conditions.
Answer.
a.

13.

What is the purpose of constellations in astronomy?
  1. They are used to predict weather patterns.
  2. They help astronomers study the Earth’s magnetic field.
  3. They serve as navigation aids for ancient explorers.
  4. They assist in locating and identifying stars and other celestial objects.
Answer.
d.

14.

The zodiac constellations are a group of constellations that lie along the apparent path of what celestial object?
  1. The Moon
  2. The Sun
  3. A comet
  4. Jupiter
Answer.
b.

15.

What primarily causes tides on Earth?
  1. Gravitational interaction between the Earth and the Moon.
  2. Earth’s rotation on its axis.
  3. Solar wind from the Sun.
  4. Atmospheric pressure changes.
Answer.
a.

16.

How many high tides and low tides occur in a typical 24-hour period?
  1. 1 high tide, 1 low tide
  2. 2 high tides, 2 low tides
  3. 1 high tide, 2 low tides
  4. 2 high tides, 1 low tide
Answer.
b.
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