Physics 2015 | Study Mode

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Question 31
A
Radio waves 
B
infrared rays 
C
Visible light 
D
Gamma rays 
Explanation.
Share Answer Infrared rays are easily detected by special photographic films and it can be used for taking picture in haze

Correct Option:
B
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Question 32
A
2 sec 
B
3 sec 
C
4sec 
D
3.2sec 
Explanation.
Share Answer From S = ut + gt2

u = 0ms-1

50 = (0 t) + (10)(t2)

50 = 5.0t2

t2 =50/5

t = 10

t = 3.2sec

Correct Option:
D
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Question 33
A
0.11kg 
B
0.12kg 
C
0.13kg 
D
0.14kg 
Explanation.
Share Answer Heat capacity (o) = mass (kg) specific heat of a substance (C2)

i.e Q = MC

where Q = 40 J/L, m = ?(380 J/Kgk)

40 = m 380

m = 0.11kg (Approx)

Correct Option:
A
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Question 34
A
2sec 
B
3sec 
C
35sec 
D
2.4sec 
Explanation.
Share Answer Using the equation

S = ut + gt2

H = s = 20m, t = ?

G =10m/s2, u = 0m/s

20 = 0 t 10 t

20 = 5t

i.e 5t2 = 20

t = 20/5 = 4

t = 4 (squaring both sides)

t2 = 4

= 2sec

t = 2sec

Correct Option:
A
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Question 35
A
2 : 5 
B
1 : 5 
C
5 : 1 
D
3 : 1 
Explanation.
Share Answer 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

Correct Option:
C
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Question 36
A
4:01 
B
1:04 
C
5:01 
D
2:01 
Explanation.
Share Answer 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

Correct Option:
A
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Question 37
A
Mercury thermometer 
B
gas thermometer 
C
clinical thermometer 
D
alcohol thermometer 
Explanation.
Share Answer 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

Correct Option:
B
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Question 38
A
Bothe light and heavy subject reach the ground at the same time 
B
he light object get to the ground first before the heavy object 
C
he heavy object to the ground first before the light object 
D
None get to the ground first 
Explanation.
Share Answer (Neglect of Air resistance)

Note: Both objects reach the ground at the same time

Correct Option:
A
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Question 39
A
4 rads1 
B
1rads11 
C
31rads1 
D
4rads11 
Explanation.
Share Answer M= 3kg, r = 0.7m, v = 2m/s

v = wr

w = angular velocity

r = radius in an tangential circular

v = speed of an object

W = V/ = 2/ 0.7 = 2.85

W = 2.853rads1 (total interest whole number)

W = &approx.; 3rads1Angular velocity (w) = 3rads1

Correct Option:
C
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