Which one of the following is an SI base unit? (a) gram (b) slug (c) newton (d)

Question

Which one of the following is an SI base unit? (a) gram (b) slug (c) newton (d) centimeter (e) kilogram Complete the following statement Today, the standard meter is defined to terms of (a) the distance from the earth's equator to the north pole. (b)the wavelength of light emitted from a krypton atom. (c)the wavelength of light emitted from a sodium atom. (d)a platinum-iridium bar kept in France. (e)the speed of light. Complete the following statement Today, Ac standard unit of mass b defined in terms of(a) a specified volume of water at 4 degreeC. (b) a standard platinum-lridium cylinder. (c)a specified number of cesium atoms. (d) a standard platinum bar. (e) the speed of light. Complete the following statement: Today, the standard unit of time b defined n terms of (a) the electromagnetic waves emitted by cesium atoms. (b)the motion of the moon around (be earth. (c)(he motion of a precision pendulum. (d)the average solar day. (e) the speed of light. Which one of the following pairs of units may not be added together, even after die appropriate unit^conversions have been made? (a)grams and millingrams (c) miles and kilometers (e) kilograms and (b)slags and kilograms (d) centimeters and yards kilometers The mathematical relationship between Arte physical quantities is given by a = b^2/c. if the dimension of b is [L]/[T]; and the dimension of c is [L]. Which one of the following choices is the dimension of a? (a)[L] (b)[T] (c)[L]/[T] (d)[L]/[T]^2 (e)[L]^2 (7) A 2_5-m ladder leans against a wail and makes an angle with the wall of 32degree as shown in the figure. What is the height A above the floor where the ladder nukes contact with the wall? (a) 2.1 m (b) 1.3 m (c) 2.4 m (d) 1.6 m (e) 1.9 m

Explanation / Answer

(1) ans

Newtron is derived by Si units

the correct option is C

(2) ans

metre is the length of the path travelled by light in vacuum in [1/299792458] part of second

so the correct option is E

((3) ans

a kilogram is equal to the mass of cylinder of platinum irridium alloy kept in the international bureau of weights and measures at sevres near pairs of france

so the correct option is B

(4) ans

a second is equal to the duration of 9192631770 periods of the radiation corresponding to the unperturbed transition b/w the two hyperfine levels of ground state of cesium atom

the correct option is A

(5) ans

kilogram and kilometre is not combained beecause they are different units

so the correct option is E

(6) ans

given a=b^2/c

so =>b=L/T , c=L

now a=[L/T]^2/L=L/T^2

so the correct option is D

(7) ans

ladder length AB=2.5 m

angle =32

now we find the height of the wall

so we asume the fig is right angle triangle

cos (theta)=BC/AB

now the height of the wall H=cos(theta)*AB

=2.1 m

so the correct option is A

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