Both the light and heavy subject reach the ground at the same time
The light object get to the ground first before the heavy object
The heavy object to the ground first before the light object
None get to the ground first
Correct answer is A
(Neglect of Air resistance)
Note: Both objects reach the ground at the same time
For a best result using temperature to achieve an accurate measurement, it is best to use
Mercury thermometer
gas thermometer
clinical thermometer
alcohol thermometer
Correct answer is B
A gas thermometers are more besting use to achieve an accurate temperature than others, such as liquid in glass thermometers such as mercury, clinical and alcohol thermometer
If the mechanical advantage of a machine is 4. What is its ratio for LOAD to EFFORT?
4:01
1:04
5:01
2:01
Correct answer is A
Mechanical advantage (M.A) of a machine is the ratio of its load to effort
Mathematically
Mechanical advantage (M.A) = Load (L) ÷ Effort (E)
In symbol M.A = L/E
Note:Mechanical (advantages has no S.I unit)
If M.A = 4 then,
L/E = 4/1
The ratio of load to effort = 4 : 1 respectively
If the velocity ratio of a machine is 5. What is its ratio of x and y?
2 : 5
1 : 5
5 : 1
3 : 1
Correct answer is C
Velocity Ratio (V.R) = distance moved by the effort (x)÷ distance moved by the load (y)
i.e. V.R = x/y
v. R = 5, x/y = ?
i.e x/y = 5/1; , where x = 5, y = 1
x : y = 5 : 1
2sec
3sec
35sec
2.4sec
Correct answer is A
Using the equation
S = ut + ½ gt2
H = s = 20m, t = ?
G =10m/s2, u = 0m/s
20 = 0 × t × ½ × 10 t
20 = 5t
i.e 5t2 = 20
t = 20/5 = 4
t = 4 (squaring both sides)
√ t2 = √4
= 2sec
∴ t = 2sec