# RRB JE Exam: Physics (Unit & Dimensions) Quiz | 18th February

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Q1.[ML-1T-2] is the dimensional formula of
[ML-1T-2] किसका आयामी सूत्र है?
(a) Force/बल
(b) Coefficient of friction/ घर्षण गुणांक
(c) Modulus of elasticity/ लोच के मापांक
(d) Energy/ ऊर्जा

Ans(c)
Sol. Modulus of elasticity is defined as the ratio of tangential stress to the shearing strain, within the elastic limit. Its unit is N/m2 or Pascal and its dimensional formula is [ML-1T-2].

Q2. The dimensional formula of coefficient of viscosity is
श्यानता के गुणांक का आयामी सूत्र क्या है?
(a) [MLT-1]
(b) [M-1L2T-2]
(c) [ML-1T -1]
(d) None of these/ इनमें से कोई नहीं

Ans(c)
Sol. [ML-1T -1] is the dimensional formula of coefficient of viscosity.

Q3. What is the correct sequence in which the lengths of the following units increase?
वह सही क्रम क्या है जिसमें निम्नलिखित इकाइयों की लंबाई बढ़ती है?
1. Angstrom/ एंग्स्ट्रॉम
2. Micron/ माइक्रोन
3. Nanometer/ नैनोमीटर
(a) 1, 2, 3
(b) 3, 1, 2
(c) 1, 3, 2
(d) 2, 3, 1

Ans (c)
Sol. The multiplier for the given units are as follows:
1 Angstrom = 10-10m.
2 Micron = 10-6m
3 Nanometer = 10-9m
Hence, the order in which the lengths of the given units increase is given by
Angstrom, Nanometer, Micron
Therefore, the correct sequence is 1, 3, 2.

Q4. The dimensional formula of couple
कपल का आयामी सूत्र क्या है?
(a) ML2T-2
(b)MLT-1
(c) ML-1T-1
(d) M1L1T-2

Ans. (a)
Sol. When two equal yet opposite forces act on a body they said to be forming a couple. The dimensional formula of couple ML2T-2

Q5. Match List-I with List -II and select the correct answer using the codes given below the lists:
सूची-I का सूची-II से मिलान कीजिये और सूचियों के नीचे दिए गए कूट का उपयोग करके सही उत्तर का चयन कीजिये:
List-I / सूची-I List-II/ सूची-II
A. Distance / दूरी 1. Hertz / हर्ट्ज़
B. Energy / ऊर्जा 2. Light Year / प्रकाश वर्ष
C. Intensity of sound / ध्वनी की तीव्रता 3. Joule / जूल
D. Frequency / आवृत्ति 4. Decibel / डेसिबल

Codes:/कूट:
A B C D
(a) 2 3 4 1
(b) 1 2 3 4
(c) 2 3 1 4
(d) 2 1 3 4

Ans.(a)
Sol. Light-year is a unit of length, joule is the unit of energy. Intensity of sound is measured in decibel. Frequency is measured in hertz (Hz).

Q6. Match List-I with List-II and select the correct answer with the help of codes given below:
सूची-I का सूची-II से मिलान कीजिये और सूचियों के नीचे दिए गए कूट का उपयोग करके सही उत्तर का चयन कीजिये:
List-I List-II
A. Temperature/तापमान 1. Kelvin/केल्विन
B. Power/ शक्ति 2. Watt/वाट
C. Pressure/ दबाव 3. Pascal/पास्कल
D. Force/बल 4. Newton/ न्यूटन

Codes:
A B C D
(a) 2 1 3 4
(b) 1 2 4 3
(c) 1 2 3 4
(d) 2 1 4 3

Ans.(c)
Sol. The unit of temperature is kelvin, power is measured in watt, pressure in pascal and force in newton.

Q7. Match List-I with List-II and select the correct answer from the codes given below:
सूची-I का सूची-II से मिलान कीजिये और सूचियों के नीचे दिए गए कूट का उपयोग करके सही उत्तर का चयन कीजिये:
List-I List-II
A. Acceleration/ त्वरण 1. Joule/ जौल
B. Electric current/ विद्युत प्रवाह 2. Newton second/ न्यूटन सेकंड
C. Work done/ किया गया कार्य 3. Ampere/एम्पेयर
D. Impulse/ आवेग 4. Metre per sec²/ मीटर प्रति सेकंड वर्ग
Codes:
A B C D
(a) 1 2 3 4
(b) 2 3 4 1
(c) 4 3 1 2
(d) 3 4 1 2
Ans.(c)
Ans. The unit of acceleration is metre per sec2. The unit of electric current is ampere. The unit of work done is joule. The unit of impulse is newton second.

Q8.Dimensional formula of thermal conductivity is
ऊष्मीय चालकता का आयामी सूत्र है?
(a) ML2T -3θ-1
(b) ML2T -2θ-4
(c) ML2T -2θ-1
(d) MLT -3θ-1

Ans(d)
Sol. The dimension of thermal conductivity is M 1 L 1 T − 3 Θ − 1. These variables are mass (M), length (L), time (T), and temperature (Θ).

Q9. Which of the following is a possible dimensionless quantity?
निम्नलिखित में से कौन सा एक संभव आयामरहित मात्रा है?

Ans (c)
Sol. Displacement gradient is a dimensionless quantity.
Q10. Which of the following is not scalar quantity?
निम्नलिखित में से कौन सी अदिश राशि नहीं है?
(a) Time/ समय
(b) Volume/ आयतन
(c) Density/ घनत्व
(d) Momentum/ संवेग

Ans (d)
Sol. Momentum is a vector quantity. A vector quantity possesses both a magnitude and direction.

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