Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
5 ms-2
15 ms-2
3 ms-2
9 ms-2
Correct answer is A
Normal reaction R = 3 kg x 10 = 30N
coefficient of friction , μ = 0.5
∴ acting frictional force = μR = 30 x 0.5
Pulling/sliding force F = 6kg x 10 = 60N.
∴ Net downward force = ma = 60 - 15.0
=> (3 + 6)a = 45
∴ 9a = 45
a = 5m/s2
The value of F in the figure above when in equilibrium is
10N
12N
20N
27N
Correct answer is C
F = \(\frac{17}{sin 60} = \frac{17}{0.866}\)
= 20N
20o
18o
35o
25o
Correct answer is D
No explanation has been provided for this answer.
When a pentavalent impurity is added to a pure semiconductor, it becomes?
a p-type semiconductor
an n-type semiconductor
an insulator
an intrinsic semi-conductor
Correct answer is B
When a pentavalent (5 outer electron)atom is added to a pure semiconductor, there is an extra electrons which does not take part in the covalent bonding resulting in an n-type semiconductor.
Which of the following can conduct electricity owing to the presence of free mobile electrons?
germanium
silicon
grapefruit
copper
Correct answer is D
Metals are good conductors due to the presence of free electrons.