# Physics 2015 | Study Mode

Question 1
A
36.2cm3
B
25.7cm3
C
72.8cm3
D
24.3cm3
##### Explanation
General formular of Gas laws

(P1V1) T1= (P2V2) T2

P1 = 800mmHg, V, = 76cm3, Tr = 273 + 27 = 300k

P2 = 760mmHg, V2 = ? T2= 273 + 0 = 273 + 6 = 277k

(800 76) 300 = (760 V2) 273

V2 = (300 76 273) (300 760) = 72.8 cm3

The volume of gas as S.T.P = 72.8 cm3

Question 2
A
P1V1= P2V2
B
V1 = V2 T1T2
C
P1T1 = P2T2
D
P1V1 T1 = P1V1 T2
##### Explanation
Boyles law stats that the volume of a given mass of a gas, at a constant temperature is inversely proportional to us pressure.

Mathematically

V l/p, v = k/p (where k is constant)

K = VP

Let k = k1

Then, if k = k, V and P = V1P1

V1P1 = V2P2

Question 3
A
Locus
B
Lines
C
Ray
D
Beam
##### Explanation
Ray a beam of light or radiation

Question 4
A
100 H
B
0.01H
C
10H
D
1H
##### Explanation
XL = WL = 2FL (w = 2f)

XL = reactance inductor (S.I unit )

L = inductance (L) in Henry

XL = 1, f = 50/, L = ?

1 = 2 50/ L

1 = 100L

i.e. 100L = 1

L = 1/100

0.01H

Inductance (L) of a inductor = 0.01H

Question 5
A
Stationary
B
In motion
C
Dipper
D
Ripple
##### Explanation
Stroboscope is a scientific instrument used to make a wave appears stationary when used

Question 6
A
I only
B
I and IV only
C
II only
D
III only
##### Explanation

In an inelastic collision, linear momentum is conserved and energy is decreased

Momentum and kinetic energy are conserved in elastic collision

Question 7
A
Displaces its own volume of the liquid (fluid)
B
Displaces its own mass of the fluid
C
Displace its own density of the fluid
D
Is no longer subjected to gravity
##### Explanation
Note:The principle of floatation states that a floating body displaces its own weight of the fluid or which its float.

For object to sink weight of the object (W) > upthrust of the fluid (v) i.e. w > u

(i.e. weight of the body (or object) mass of the fluid)

Question 8
A
PV T = a constant
B
PV = a constant
C
v/t = a constant
D
p/T = a constant
##### Explanation
Formula for general gas law

V 1/T P

N [(PV) T] = K is constant

Question 9
A
He saw a flying objects
B
He must be thinking of water and food
C
He was seeing the shadow of the car
D
The sun ray from the sky were passing from a hot air (layer) to cold layer
##### Explanation
The appearance of pool of water on road surfaces is called MIRAGE

His observation show that light from the sun ray refracted through a layer of hot air(layer) which is closed to the ground, passes from a hot air layer to the cold layer

Question 10
A
The sun
B
The moon
C
light candle
D
Star
##### Explanation
Sun are self luminous source
Moon is a non luminous

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