If the velocity of a body is doubled-

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RRB ASSISTANT LOCO PILOT (Patna) 2013 click here to view all questions

If the velocity of a body is doubled-

AIts Kinetic Energy is doubled

BIts potential Energy is doubled

CIts Momentum is doubled

DIts Acceleration is doubled

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Which of the following is a scalar quantity?

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RRB ASSISTANT LOCO PILOT (Patna) 2013 click here to view all questions

Which of the following is a scalar quantity?

AElectric Field

BAverage Velocity

CPower

DMagnetic Momentum

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Which one of the following longitudes determines the Indian Standard Time?

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RRB ASSISTANT LOCO PILOT (Patna) 2013 click here to view all questions

Which one of the following longitudes determines the Indian Standard Time?

A85.5°E

B86.5 °E

C84.5 °E

D82.5 °E

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An athlete runs 200 metres in 24 seconds. What is her speed in kilometres per hour?

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KPTCL Assistant Exam (Mescom) SLOT1 2017 click here to view all questions

An athlete runs 200 metres in 24 seconds. What is her speed in kilometres per hour?

A30

B15

C8.3

D2.3

rakesh ? Jan 4 '2020 at 10:56

Correct answer is : 30

Explanation:

Speed of athlete,

\(= \frac{200 \text{ m}}{24 \text{ secs}}\)
\(= \frac{200 \times 185}{24}\)

\(=30 \text{ km}/ \text{hour}\)

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At what temperature do both Centigrade and Fahrenheit thermometers show the same reading?

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RRB ASSISTANT LOCO PILOT (Allahabad) 2010 click here to view all questions

At what temperature do both Centigrade and Fahrenheit thermometers show the same reading?

A−20°

B−40°

C42°

D0°

dinesh ? Dec 23 '2019 at 19:56

Correct answer is: −40°

Explanation:

Let F is Fahrenheit and C is Celsius.

The conversion formula is:

\(F = C \times \frac{9}{5} + 32\)

given that F and C is equal.

so,

\(F = F \times \frac{9}{5} +32\)

\(F- \frac{9F}{5} =32\)
\(\frac{5F-9F}{5}=32\)

\(\frac{-4F}{5}=32\)

\(-4F = 32 \times 5\)

\(F = - \frac{160}{4}\)

\(F = -40\)

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