Physics Test 65

Result

Physics Test 65

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Weekly Quiz Competition

Question 1
4 / -1

Choose INCORRECT statement :-

A
A vector may have more than 2 components

B
Component of vector may be equal or lesser to it

C
Component of vector must be greater than the vector itself

D
Sum of two vectors can't be greater the sum of their magnitude
Question 2
4 / -1

If force in a physical event is given by F = ae^-bt / r²where r is radius and t is time then dimension of a and b are :-

A
M²L³T^–2, T

B
ML³T^–2, T^–1

C
MLT^–2, T^–1

D
ML³T^–2, T⁰

Solution

[a] = [Fr²] = [MLT^–2] [L²] = ML³T^–2,

[b] = [1 / t] = T^–1
Question 3
4 / -1

The resistance R = V / iwhere V = 100 ± 5 volts and i = 10 ± 0.2 amperes. What is the total error in R

A
5%

B
7%

C
52%

D
5/2%
Question 4
4 / -1

A nonconducting solid sphere of radius R is charged uniformly. The magnitude of the electric field due to the sphere at a distance r from its centre :–

(a) increases as r increases, for r < R

(b) decreases as r increases, for 0 < r < ∞

(c) decreases as r increases, for R < r < ∞

(d) is discontinuous at r = R

A
a, c

B
c, d

C
a, b

D
b, d

Solution

r < R, E ∝ r

r > R, E ∝ 1 / r²