Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 19

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Choose the incorrect statement :

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Important Questions on Physics and Measurement

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 20

The dimensional equation for the electrical resistance of a conductor is

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 21

A force

F

is given by,

F = a t + b t^{2}

, where

t

is time. What are the dimensions of

a

and

b

?

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 22

If

A = B + \frac{C}{D + E},

the dimensions of

B

and

C

are

[M^{0} {LT}^{- 1}]

and

[M^{0} {LT}^{0}],

respectively. Find the dimensions of

A, D

and

E

.

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 23

If

E =

energy,

G =

gravitational constant,

I =

impulse and

M =

mass, the dimension

\frac{G I^{2} M}{E^{2}}

is same as that of,

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 24

In a vernier callipers, the least count of main scale is $1 mm .$ $20$ division of vernier scale are matching with $19$ divisions of main scale. The thickness of the object measured by the vernier callipers will be :

Question Image

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 25

The vernier of a circular scale is divided into

50

divisions which coincides with

49

main scale divisions. Each main scale division is

0.5 ° .

The least count of the instrument is

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 26

A public park, in the form of a square, has an area of

(100 \pm 0.2) m^{2}

. The side of park is

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Physics Crash Course JEE Main>Chapter 1 - Physics and Measurement>Level 1>Q 27

An object falls for a time of

0.25 s

. The acceleration of free fall is

9.81 m s^{- 2}

. The displacement is calculated. Which of the following gives the correct number of significant digits for the calculated value of the displacement of the object?