Explore topic-wise InterviewSolutions in Current Affairs.

Correct answer is (a) Absolute error

Strain, refractive index.

(a) Unit: An arbitrarily chosen standard of measurement of a quantity, which is accepted internationally is called unit of the quantity. The units in which the fundamental quantities are measured are called fundamental or base units and the units of measurement of all other physical quantities, which can be obtained by a suitable multiplication or division of powers of fundamental units, are called derived units. 

(b) Rounding – off: In no case should the result have more significant figures than die figures involved in the data used for calculation. The result of calculation with numbers containing more than one uncertain digit should be rounded off. The rules for rounding off are given below.

(c) Dimensionless quantities: On the basis of dimension, dimensionless quantities are classified into two categories.

(i) Dimensionless variables: 

Physical quantities which have no dimensions, but have variable values are called dimensionless variables. Examples are specific gravity, strain, refractive index etc.

(ii) Dimensionless Constant:

Quantities which have constant values and also have no dimensions are called dimensionless constants. Examples are π, e, numbers etc.

(d) Relative velocity

Correct answer is (b) chance error

Correct answer is (b) Gross

(c) arithmetic mean

Correct answer is (c) \(\frac{∆Z}{Z}\) = \(\frac{∆A}{A}\) + \(\frac{∆B}{B}\)

 (a) \(\frac{∆Z}{Z}\) = \(n \frac{∆A}{A}\)

 Correct answer is (c) \(\frac{∆Z}{Z}\) = \(\frac{∆A}{A}\)+\(\frac{∆B}{B}\)

Correct answer is  (b) ∆Z = ∆A + ∆B

we know that the length of the parallel sides is 55cm and 35cm

Let us consider Height (h) = x cm

Area of trapezium = 1080cm²

By using the formula Area of trapezium = ½ × (sum of parallel sides) × height

1080 = ½ × (55+35) × x

1080 = ½ × 90 × x

1080 = 45x

x = 1080/45

x= 24

∴ The distance between the parallel lines is 24cm.

Correct answer is (d) 0.11s

Correct answer is (b) \(a_m - ∆a_m\, to \, a_m +Δ a_m\) 

Given 

Length of parallel sides is 55cm and 35 cm 

Area of trapezium= 1080 cm² 

Let Height (h) = y cm 

We know that area of trapezium is \(\frac{1}{2}\)× (sum of parallel sides) × height

Therefore Area of trapezium is \(\frac{1}{2}\)× (55 + 35) × y =1080 cm².

\(\therefore \frac{1}{2}\)× (90) × y =1080

⇒ 45 × y =1080

⇒ y \(=\frac{1080}{22}=24\)

∴ Distance between the parallel lines is 24 cm.

Correct answer is (a) error

Correct answer is (c) Systematica

Correct answer is (c)\(\frac{a}{4}\)

Correct answer is (d) \(Δa_n = a_m - a_n\)

(a) Systematic error

Given, 

Given Distance of Jupiter = 824.7 × 10⁶ km = 8.247 × 10¹¹ m 

angular diameter = 35.72 × 4.85 × 10^-6 rad = 173.242 × 10^-6 rad 

= 1.73 × 10^-4 rad 

∴ Diameter of Jupiter D = D × d = 1.73 × 10^-4 rad × 8.247 × 10¹¹ m 

= 14.267 × 10⁷ m = 1.427 × 10⁸ m (or) 1.427 ×10⁵km

Correct answer is (d) [MLT⁻²] and [MLT^-0]

(a) fractional error

Correct answer is (d) [LT^-3 ]

(a) random error

Speed of light in vacuum, c = 1 new unit of length s^-1 

t = 8 min. 20 sec, = 500 s 

x = ct= 1 new unit of length s^-1 × 500s 

x = 500 new unit of length

percentage relative error in measurement of length is 2%.

The unit of left hand side is metre so the units of ct² should also be metre. 

Since t² has unit of s² , so the unit of c is m/s²

Correct answer is (d) 7%

(i) Mass of box = 2.3 kg 

Mass of gold pieces = 20.15 + 20.17 = 40.32 g = 0.04032 kg. 

Total mass = 2.3 + 0.04032 = 2.34032 kg 

In correct significant figure mass = 2.3 kg (as least decimal) 

(ii) Difference in mass of gold pieces = 0.02 g 

In correct significant figure (2 significant fig. minimum decimal) will be 0.02 g

Correct answer is (d) 4%

(a) The unit of λ is same as that of x and A

(c) angular momentum

A) Both statement are true

A) red colour on the outermost layer

The correct option is (A) red colour on the outermost layer 

Red, Orange, Yellow, Green, Blue, Indigo and Violet 

Solution : 

(a) Red 

(b) Violet

(b), (c), (d)

(b) can be zero at specific points. 

(c) can be positive or negative. 

(d) is bounded.

By using two identical prisms, one placed inverted with respect to the other we get a narrow beam of white light incident on one prism emerges out of the second prism as white light.

When a ray of ordinary light is passed through a triangular glass prism, it splits to form a band of seven colours.

original length, will (d) remain same.

The Young’s modulus of elasticity 

(d) will decrease.

1. Young’s modulus (Y): It is the modulus of elasticity related to change in length of an object like a metal wire, rod, beam, etc., due to the applied deforming force.

2. Bulk modulus (K): It is the modulus of elasticity related to change in volume of an object due to applied deforming force.

3. Shear modulus or Modulus of rigidity (n): The modulus of elasticity related to change in shape of an object is called modulus of rigidity.

Correct Answer is: (B) Synergids 

Male gamete migrates towards the secondary nucleus and fuses with it. This phenomenon is known as triple fusion and results in the formation of a triploid primary endosperm mother cell which forms the endosperm.

Correct Answer is: (C) Both A and B 

There are two types of food chains, namely grazing food chain and detritus food chain. Grazing food chain starts with producer followed by herbivores followed by primary carnivore and secondary carnivore. 

It ends with decomposers. It is the major conduit of energy for aquatic ecosystem.

(C) Both A and B

D) all of the above