class 11th Physics

Q.1

1) d) [M^0L^0T^0]
2) d) 180^0
3) c) 1.5
4) d) the pole of the earth
5) d) mg/2πr^2
6) b)35∘C to 42∘C.
7) a)longitudinal progressive waves
8) a)4 * 10^-11 second.
9) c) Two parallel plates.
10)

Q.3

Following are the seven fundamental quantities:
Length (metre)
Mass (kilogram)
Time (second)
Electric current (ampere)
Thermodynamic temperature (kelvin)
Amount of substance (mole)
Luminous intensity (candela)

Q.4

Q.5

1. Acceleration: Acceleration is the rate of change of velocity with respect to time. It is a vector quantity. Dimension: [M0L1T-2] If a particle moves with constant velocity, its acceleration is zero. 2. Average acceleration: Average acceleration is the change in velocity divided by the total time required for the change. If ⟶ V 1 V1⟶ and ⟶ V 2 V2⟶ are the velocities of the T particle at time t1 and t2 respectively, then the change in velocity is and the time required for this change is ∆t = t2 – t1