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Quiz 4
Mdcat-past-papers - NMDCAT - Physics Quiz
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Board: NMDCAT | Subject: Physics |
61. Magnetic flux through Earth is:
Strong
Weak
Zero
100
62. The magnetic field of Earth at its surface is:
2 Gauze
½ Gauze
¼ Gauze
2.5 Gauze
63. Magnetic force depends upon:
Current
Length
Magnetic field
All of above
64. Magnetic flux is maximum when angle between magnetic field and vector area:
0°
90°
180°
45°
65. Transformer is a device which steps up or down the input:
Current
Voltage
Energy
Power
66. Lenz's law is used to find the direction of:
Induced current
Induced emf
Both
Can't find direction
67. In step-up transformer, current across the secondary:
Increases
Decreases
Remain constant
Does not produce at all
68. Which is correct relation related to transformer?
Ns/Np = Vs/Vp
NsNp = Vs/Vp
Ns/Np = Vp/Vs
VsIp = VpIs
69. Ripple factor of full wave rectifier is:
1
1.21
0.48
0.51
70. There are initially 400 atoms in a radioactive substance. What would be the number of atoms after 3 half-lives?
25
50
200
400
71. Alpha particle has same electrons as:
H
H⁺
He
H₂
72. Positive rays are also called:
X-rays
Gamma rays
Alpha rays
Beta rays
73. High speed beta rays are:
Electron
Positron
Electron & Positron
Proton
74. While using radiation therapy, cancerous thyroid is treated with:
Carbon
²³⁵Uranium
Thorium
Iodine-131
75. Proton is made up of ----- quarks:
1 up, 2 down
2 up, 1 down
2 up, 2 down
1 up only
76. What is the value of up quark?
0.666666667
0.333333333
-0.666666667
-0.333333333
77. Number of quarks in hydrogen atom are:
1
3
5
7
78. Number of quarks are:
2
4
6
8
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