CBSE 11TH PHYSICS - Online Test
Q1. The specific gravity of a material is
Answer : Option C
Explaination / Solution:
The specific gravity of an object is the ratio between the density of an object to a reference liquid. Usually, this reference liquid is water, which has a density of 1 g/mL or 1 g/cm3.
Water has a specific gravity equal to 1. Materials with a specific gravity less than 1 are less dense than water, and will float on the pure liquid; substances with a specific gravity more than 1 are more dense than water, and will sink.
Q2. Kinetic theory relates measurable properties.
Answer : Option D
Explaination / Solution:
Kinetic theory explains the behaviour of gases based on the idea that the gas consists of rapidly moving atoms or molecules. It also relates measurable properties of gases such as viscosity, conduction and diffusion with molecular parameters, yielding estimates of molecular sizes and masses.
Q3.
The ice and steam point have values 32 F and 212 F respectively, on the Fahrenheit scale. Corresponding values on the Centigrade scale are
Answer : Option D
Explaination / Solution:
C5=F−329
Q4. Fundamental or base quantities are arbitrary. In SI system these are
Answer : Option A
Explaination / Solution:
A base quantity is chosen and arbitrarily defined, rather than being derived from a combination of other physical quantities. The 7 base quantities are:
| PHYSICAL QUANTITY | BASE SI UNIT |
|---|---|
| Mass (m) | Kilogram (Kg) |
| Length (ll) | Metre (m) |
| Time (t) | Second (s) |
| Current (II) | Ampere (A) |
| Temperature (T) | Kelvin (K) |
| Amount of sub. (n) | Molar (mol) |
| Luminous Intensity (L) | Candela (cd |
Q5. How can you describe a periodic motion
Answer : Option D
Explaination / Solution:
A motion of a body that repeats itself at regular intervals of time on the same path like rotation of earth around sun in 365.25 days
Q6. According to Kepler’s Law of periods, The _______________ of the time period of revolution of a planet is proportional to the cube of the ___________ of the ellipse traced out by the planet
Answer : Option B
Explaination / Solution:
Kepler's 3rd Law: T2 = a3. Kepler's 3rd law is a mathematical formula. It means that if you know the period of a planet's orbit (T = how long it takes the planet to go around the Sun), then you can determine that planet's distance from the Sun (a is the length of the semimajor axis of the planet's orbit)
Q7. Path length is defined as.
Answer : Option B
Explaination / Solution:
Path length is defined as the total length of the path traversed by an object.
Unlike displacement, which is the total distance an object travels from a starting point, path length is the total distance travelled, regardless of where it travelled.
Q8. Electromagnetic waves are different from sound waves in that
Answer : Option C
Explaination / Solution:
Electromagnetic waves are transverse waves, they move perpendicular to the direction of propagation of wave ( the direction in which energy is transferred) and EM waves( Electromagnetic waves) can travel in vacuum, thus doesn't require any medium also.
Q9. In rotation of a rigid body about a fixed axis is that in which
Answer : Option A
Explaination / Solution:
When a rigid body rotates about a fixed axis, all particles of the body except those which lies on the axis of rotation, move along circular paths in a plane perpendicular to the axis.
Q10. The scientific method is
Answer : Option A
Explaination / Solution:
The scientific method is a body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. To be termed scientific, a method of inquiry is commonly based on empirical or measurable evidence subject to specific principles of reasoning.
