Subject: Physics (Checkpoint) Class: 8th Total Marks: 20
Name:
_______________________
1)
Substances
having specific shapes and volumes are called.
(a) solids (b) liquids
(c) gases (d) plasma
2) Pressure is
quantity: (a) Scalar (b) Vector (c) Constant
(d)Dependent
3) As we go up the value of atmospheric pressure is:(a) Decreased (b) Increased (c) constant (d) None
4) SI unit of
pressure is Pascal, which is equal to: (a) 104 Nm-2 (b) 103Nm-2 (c) 1Nm 2 (d) 1Nm-2
5) In SI system,
unit of density is: (a) kgm-1 (b) kgm-3 (c) kgm (d) kgm-2
6)
The resistance of voltmeter is: (a) zero (b) low (c) 10 W (d) very
high
7)
The unit of potential
difference is: (a) joule (b) coulomb (c) ampere (d)
volt
8)
In SI the unit of charge is: (a) Joule (b) Volt (c)
Watt (d) Coulomb
9) Battery is one of the sources of (a) Heat (b) Light (c) Sound (d) Current
10)
Which device is used to store charge? (a) resistor (b)
dielectric (c) fuse (d) capacitor
11) In solids, heat
is transferred by: (a)radiation (b)
absorption (c) convection (d) conduction
12) Heat
transfer in rod depends upon
(a) Length (b) cross-sectional Area (c) mass (d)
material of rod
13) In gases, heat is mainly transferred by:
(a) Free electrons (b) conduction (c) radiation (d) convection
16) The ampere is a unit of:
(a) energy (b)
potential difference (c) electric
potential (d) electric current
17) The rate of flow of charge through any
cross-sectional area is called:
(a) electric current (b) energy (c) charge (d) Potential difference
18) The current used in houses is:
(a) Alternating current (b)
Conventional current (c) Direct current (d) None of these
19) In electrostatic all charges are in:
(a) the same direction (b) friction (c) motion (d) fixed state
20)
The substances
which have free electrons are called:
(a)
Insulators (b) Conductors (c) capacitors (d) None of these
Subjective Part
Class: 8 (Physics Checkpoint) Marks: 30
Part.1
(Attempt
any Ten (10) questions.) (10×2=20)
1. The mass of 200 cm3 of stone is 500 g. Find its density.
2. What is atmospheric pressure? Give an experiment example
3. Why the supporting wall of the dam is built very broad at the bottom?
4. State Pascal’s law with unit and symbol. Give some applications in
our daily life.
5. A student presses her palm by her thumb with a force of 75 N. How much
would the pressure under her thumb have a contact area of 1.5 cm2?
6. The head of a pin is a square of a side of 10mm. Find the pressure on it due
to the 20N force.
7. How Pressure works in Aerosols?
8. What is meant by a moment of a force? Write the
factors on which it depends.
9. What measures should be taken to save energy in our houses?
10. Define these with proper
diagram symbol and unit: Current, Resistance, and Amperes,
11. write five names of each conductor and insulator present in your
classroom.
12. Give an idea about fuse and Write its importance?
Part.2
(Attempt
any Two (2) questions.) (5×2=10)
1) Explain all methods of heat transfer with the help of proper Diagrams.
2) Define
Voltage and how we can measure it with the help of Voltmeter Explain with a circuit diagram.
3) A
wooden block measuring 40 cm, 10 cm, and 5 cm has a mass of 850 g. Find the density of the wood.
