Physics 2015 | Study Mode

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Question 41
A
Proton 
B
Neutron 
C
Electrons 
D
Atoms 
Explanation.
Share Answer Electron: A subatomic particle haring a negative charge and orbiting the nucleus (note: the symbol 01e represent the particle of an electrons.)

Correct Option:
C
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Question 42
A
2 1018HZ 
B
3 10 19HZ 
C
3 1021HZ 
D
3 10-19HZ 
Explanation.
Share Answer

\(Wavelength (\lambda) = 10^{-13}m\)

Speed of X-ray = speed of light \(C = 310^{8}m/s\)

Frequently (f) = ?

\(Using V = f\lambda (or ( f for electromagnetic wave)\)

\(f = \frac{c}{\lambda} = 3 \times 10^{8} 10^{-13} = 3 \times 10^{8} \times 10^{13}\)

= \(3 \times 10^{8} \times 10^{13}\)

= \(3 \times 10^{21}Hz\)


Correct Option:
C
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Question 43
A
Increase in the number of turn of the coil 
B
Decrease in current with the coil 
C
Increase in the distance between the pole 
D
Increase in current without the coil 
Explanation.
Share Answer Note: the strength of an electromagnet increase with a decrease in the number of turns of the coil other are(ii) increase in current with in the coil

Correct Option:
A
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Question 44
A
15C 
B
40C 
C
20C 
D
10C 
Explanation.
Share Answer R0 = 7 , R1 = 7.2 , R2 = 7.5 , Tx = ?

[(X T100C) (R1 - R0)] = [(T100C T0C) (R2 - R0)]

[(Tx 0) (72 7)] = [(100 0) (7.5 7)]

Tx/0.2 = (100 0.5)

Tx = [(0.2 100)] 0.5

= 20/0.5 = 40C

Correct Option:
B
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Question 45
A
I only 
B
III & IV only 
C
II & III only 
D
II only 
Explanation.
Share Answer

The simplest way to change the boiling point of a liquid is to change the surrounding pressure. (a) Using a closed system to artificially increase that pressure will raise the boiling point of a liquid. (b) Boiling point is dependent upon the strength of the bonds between its molecules. For this reason, adding a solute to the liquid will create stronger bonds between molecules, raising the solutions boiling point without increasing pressure.


Correct Option:
C
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Question 46
A
15Nm 
B
25Nm 
C
3Nm 
D
4Nm 
Explanation.
Share Answer

No official Explanation yet!


Correct Option:
D
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Question 47
A
I & II only 
B
II only 
C
I, II, & III only 
D
III only 
Explanation.
Share Answer Fig (I) (II) (III) are they in which a transformer was designed to reduce an energy loses by reducing through this collective designed or efforts

Correct Option:
C
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Question 48
A
Mercury only 
B
Alcohol and Water 
C
Mercury and Alcohol 
D
Alcohol only 
Explanation.
Share Answer Mercury and alcohol are often used in THERMOMETER

Note:Water is never allowed to be used in thermometer because, it doesnt expand uniformly

Correct Option:
C
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Question 50
A
27m/s2 
B
2m/s2 
C
4m/s2 
D
7m/s2 
Explanation.
Share Answer For maximum range (Rmax)

Rmax = U2 g where Rmax = 36m, U2 = ?, g = 9.8m/s2

36 = U2 2 8.8

U2 = 36 2 9.8m = 705.8

U = 705.6 = 26.5 (squaring both side)

u= 26.5m/s, U = 27m/s (Approx.)

The speed of projection = 27m/s2

Correct Option:
A
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