If \(u_1\) and \(u_2\) are the units selected in two systems of measurement and \(n_1\) and \(n_2\) are their numerical values, then:

1. \(n_1u_1=n_2u_2\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \)
2. \(n_1u_1+n_2u_2=0\)
3. \(n_1n_2=u_1u_2\)
4. \((n_1+u_1)=(n_2+u_2)\)

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eV is 

1. Same as one joule

2. 1.6×1019J

3. 1 V

4. 1.6×1019C

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 75%
From NCERT
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1kWh=

1. 1000W

2. 36×105J

3. 1000J

4. 3600J

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 65%
From NCERT
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Universal time is based on :

1. Rotation of the earth on its axis

2. Earth's orbital motion around the Sun

3. Vibrations of cesium atom

4. Oscillations of quartz crystal

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From NCERT
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Unit of moment of inertia in MKS system 

1. kg×cm2

2. kg/cm2

3. kg×m2

4. Joule×m

Subtopic:  Dimensions |
 67%
From NCERT
PMT - 1984
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Unit of stress is: 
1. \(\frac{\text{N}}{\text{m}}\)
2. \(\text{N-m}\)
3. \(\frac{\text{N}}{\text{m}^2}\)
4. \(\text{N-m}^2\)

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 74%
From NCERT
PMT - 1984
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Unit of magnetic moment is

1. Amperemetre2

2. Amperemetre

3. Webermetre2

4. Weber​​/metre

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 54%
From NCERT
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Curie is a unit of 

1. Energy of γ-rays

2. Half life

3. Radioactivity

4. Intensity of γ-rays

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 72%
From NCERT
PMT - 1992
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Hertz is the unit of

1. Frequency

2. Force

3. Electric charge

4. Magnetic flux

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 92%
From NCERT
PMT - 1999
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One pico Farad is equal to

1. 1024F

2. 1018F

3. 1012F

4. 106F

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 78%
From NCERT
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