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Q:

Find the resistance (in mega Ω) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200 Ωm.

A) 40 B) 4000
C) 80 D) 2000
 
Answer & Explanation Answer: A) 40

Explanation:
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3 1862
Q:

Radiocarbon dating technique is used to estimate the age of

A) fossils B) rocks
C) monuments D) soil
 
Answer & Explanation Answer: A) fossils

Explanation:

Radiocarbon dating also referred to as carbon dating or carbon-14 dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.

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12 1860
Q:

Which of the following never occurs singly in nature?

A) Inertia B) Momentum
C) Force D) Velocity
 
Answer & Explanation Answer: C) Force

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2 1859
Q:

Rate of change of displacement is known as ............

A) Acceleration B) Velocity
C) Speed D) Distance
 
Answer & Explanation Answer: B) Velocity

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4 1858
Q:

In spherical polar coordinates (l, q, a), q denotesthe polar angle around z-axis and a denotes the azimuthal angle raised from x-axis . Then the y-component of P is given by

A) Psinq sina B) Psinq cosa
C) Pcosq sina D) Pcosq cosa
 
Answer & Explanation Answer: A) Psinq sina

Explanation:

The Cartesian Coordinates can be retrieved from spherical coordinates (l,q,a) by:

X = r.sinq.cosa

Y = r.sinq.sina

Z = r.sinq

Using the same we get for P,

Y = P.sinq.sina

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0 1856
Q:

What is the unit of the physical quantity "Jerk"?

A) meter second B) meter per second cube
C) meter per second square D) meter per second
 
Answer & Explanation Answer: B) meter per second cube

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0 1847
Q:

What is the unit of the physical quantity "Inductance"?

A) weber B) farad
C) henry D) tesla
 
Answer & Explanation Answer: C) henry

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2 1843
Q:

Liquids and gases never show

A) diamagnetic property B) paramagnetic property
C) ferromagnetic property D) electromagnetic property
 
Answer & Explanation Answer: C) ferromagnetic property

Explanation:

On the basis of magnetic properties, substances are classified into three groups namely diamagnetic, paramagnetic and ferromagnetic.

As solids diffuse and reorder very slowly under ambient conditions, the net, directionally dependent (anisotropic) magnetic moment can persist. Conversely, liquids and gases freely tumble and reorder: water rearranges every few pico seconds (10^12 times per second).

Hence liquids and gases can never show ferromagnetic properties.

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