Explore topic-wise InterviewSolutions in Current Affairs.

Balanced force keeps the body at rest.

Correct option is: (a) velocity

Correct option is: (b) speed

Scalars are physical quantities having magnitude only whereas, vectors are physical quantities having both magnitude and direction.

Correct option is: (a) Distance

Correct option is: (b) 3 x 10⁸

Newton’s second law of motion gives the measure of force.

Correct option is: (c) positive

Correct option is: (c) uniform circular

Correct option is: (d) its speed and direction both remain the same

(a) Distances measured may be of different lengths depending on the path taken.

(b) Dotted line shows the shortest way of reaching from A to B.

(c) If we increase the number of sides of the polygon and make it infinite, then we will have to change the direction an infinite number of times. The shape of the path thus obtained will be a circle.

Correct option is: (a) uniform acceleration

Correct option is: (c) Sir Issac Newton

Correct option is: (a) uniform, distances 

The two states that have rich mineral deposits are Jharkhand and Orissa. These states are backward in spite of rich mineral deposits because of the required technology, economy and facilities for development lack in these areas. There is a lack of quality support and human resources in the utilization of the resources. The factors which contribute to the lack of development is the unstable government in the case of Jharkhand. There have been frequent changes in the government due to fewer chief ministers, their short reigns and the failure of political parties in achieving majority vote from the people contribute to the formation of an unstable government. Thus, there is no progress.

Correct option is: (a) deceleration or retardation

Correct option is: (a) negative

Developed resources are those resources which are suitable for utilisation after a careful survey of their quantity and quality. The conditions under which resources can become developed are that they need to have the technology to utilize the resources to their full potential. Sufficient manpower, economy and sufficient knowledge of limitations and availability of the resource is required to develop them.

Correct option is: (D) zero

Correct option is: (D) \(\sqrt{2mE}\)

\(E = \frac{1}{2} mv^2\)

\(v = \sqrt \frac{2E}{m}\)

\(P = mv\)

\(P = m \sqrt \frac{2E}{m}\)

\(P = \sqrt{2mE}\)

Correct option is: (D) \(\sqrt{2mE}\)

Correct option is: (A) 90°

Torque = \(\overrightarrow r \times \overrightarrow F\)

\(\tau = r \ F sin \ \theta\)

.\(\because \ \theta = 90^\circ \)

\(\tau_{max} = r \ F \ sin 90^\circ\)

Correct option is: (A) 90°

Answer is (a) objective function

A series in which each term is the product of corresponding terms of an A.P. and a G.P. is called an Arithmetico-Geometric series.

The general or standard form of such a series is

a + (a + d)^r + (a + 2d)r² + (a + 3d)r³ + ..... + {a + (n – 1) d}rⁿ – 1 + .... where each term is formed by multiplying the corresponding terms of the two series.

A.P. : a + (a + d) + (a + 2d) + ..... + (a + (n – 1)d) + ..... and 

G.P. : 1 + r + r² + ..... + rⁿ – 1 + .....

Answer is (c) constant function

(i) The A.P. and G.P. corresponding to the given series

\(\frac{1}{3}\) + \(\frac39\) + \(\frac5{27}\) + \(\frac{7}{81}\) + ............ are respectively

1, 3, 5, 7, .............. and  \(\frac{1}{3}\), \(\frac39\), \(\frac5{27}\), \(\frac{7}{81}\),...........

nth term of A.P. = (1 + (n – 1)2) = (2n – 1)

nth term of G.P. = \(\frac{1}{3}\). \(\big(\frac{1}{3}\big)^{n-1}\) = \(\big(\frac{1}{3}\big)^{n}\)

∴ nth term of the given series = (2n - 1)\(\big(\frac{1}{3}\big)^{n}\).

(ii) The given arithmetico-geometric series is

1 – 2x + 3x² – 4x³ + ..... 

where corresponding A.P. and G.P. are respectively 1, 2, 3, 4, .... and 1, – x, (– x)², (– x)³, ..... 

nth term of A.P = (1 + (n – 1) 1) = n 

nth term of G.P = 1 . (– x)^{n – 1} = (– 1)^{n – 1} (x)^{n – 1}.

∴ nth term of the given series = n . (– 1)^{n – 1} x^{n – 1} = (– 1)^{n – 1} nx^{n – 1}.

The space between the retina and eye lens is filled with another fluid called vitreous humour. The light coming from an object enters the eye through cornea and pupil.

Inertia can be defined as the property of matter by virtue of which it opposes any change in its state of rest or of uniform motion along a straight line.

Inertia is classified as:

• Inertia of rest

• Inertia of motion

• Inertia of direction

• A passenger standing in a bus leans backwards when the bus starts all of a sudden

• Fruits fall down when the branches of a tree are shaken

• Dust particles on a carpet falls when we beat the carpet with a stick

Yes, when a current in coil A changes, magnetic field lines linked with coil B also change. Hence, due to change in number of magnetic field lines, there is an induced current in coil B.

W = F cos θ s 

Where, 

W is the work done 

F is the force applied 

s is the distance travelled by the body 

θ is the angle between the direction of force and the direction of motion of the body

0.5 kg of cotton occupies more space than 0.5 kg of iron. The particles of iron are closely packed while that of cotton is loosely packed. The amount of iron packed in a unit volume is more. This explains as to why iron is heavier than the same volume of cotton.

In Physics, we describe the lightness or heaviness of different substances by using the word density.

The density of a substance is defined as the mass of the substance per unit volume.

Density = mass of the substance/volume of the substance

D = M/v.

Where, 'D' represents the density, 'M' mass and 'V' volume.

SI unit of density is kg/m³.

The density of a substance remains the same under certain specified conditions. Thus the density of a substance is one of its characteristic properties and this property can be used to determine the purity of any substance.

It is used in designing ships and submarines. The lactometers and hydrometers used for measuring the purity of a sample of milk and for determining the density of the liquids are based on this principle.

1. Maxwell’s Right hand rule.

2. Fleming’s Left hand rule.

3. Fleming’s Right hand rule.

Due to growing population and development in different fields, demand and use of traditional energy sources is continuously increasing. The storage of deposits of these resources is limited, a day will come when these deposits would exhaust if their use is done with the same speed and manner. It would result into energy crisis. Hence it is essential that we should use them wisely and try to find alternate sources of energy and increase their use.
Measures of conservation energy:

1. Use electric appliances when needed
2. When no body is in the room electric appliances should be switched off.
3. Use solar cooker, pressure cooker etc to save energy.
4. Avoid wastage of traditional sources of energy.
5. Close the engines of automobiles while waiting of any one or at traffic points.
6. Optimum use of solar energy.
7. Use of biotic energy resources.
8. Such techniques should be used in building construction so they may remain cool in summers and warm in winter so less use for A.C, heater and electricity could be saved’
9. LED bulbs and tube lights should be used in place of ordinary bulbs and tube light to save energy.
10. Regular checkup and servicing of vehicles.

When the velocity of a body is doubled, then its kinetic energy will become 4 times.

Energy stored in burinng objects of hot objects. When this energy is converted from one form into another form, it is called heat energy conversation.
Examples:
(a) Electric heater converts electric energy to heat energy.
(b) Solar cell converts light energy to electric energy.
(c) Electric generator converts mechanical energy to electric energy.

Water in the overhead tanks and striking hammer have potential as well as kinetic energies. Flying bird and running fan have both potential as well as kinetic energies.

Aavro is generally maintained by shroffs and big businessmen.

Aavro is useful for detecting errors and mistakes in all the transactions in the books of accounts and it is also useful as a tool of control.

When the actual cash balance tallies as per Shri Purant Baki, then it is called as ‘Mel Malyo’.

The object of Rojmel is to find cash balance daily.

Correct option is (b) Instalment

The universal gas constant R signifies the workdone by (or on) a gas per mole per kelvin. Its value is R = 8.314 J mol^-1 K^-1

The equation which relates the pressure (P), volume (V) and temperature (T) of the given state of an ideal gas is known as gas equation. 

The total number of independent modes (ways) in which a system can possess energy is called the degree of freedom (f). 

The degree of freedom are of three types : 

(i) Translational degree of freedom 

(ii) Rotational degree of freedom 

(iii) Vibrational degree of freedom

Boltzmann's constant, also called the Boltzmann constant and symbolized k or k_B, defines the relation between absolute temperature and the kinetic energy contained in each molecule of an ideal gas.

Dimension:  [ML²T^–2θ^–1]

k = 1.38 × 10^–23 Joule/kelvin 

Samudragupta. did not annex the south Indian kingdoms because he realized it would not be easy to control such a vast empire without proper transport and communication facilities.

Samudragupta’s empire extended from Bengal in the east to Delhi in the west from the Himalayas in the north to Narmda in the south. His indirect control over the vassal states also.

Chandragupta II