In which year was the Doppler effect discovered by Austrian scientist Christian Doppler, which describes the change in frequency of any kind of sound or light wave produced by a moving source with respect to an observer?
(A) 1846
(B) 1844
(C) 1842
(D) 1840
The Doppler effect was discovered by Austrian scientist Christian Doppler in 1842, describing the change in frequency of any type of sound or light wave produced by a moving source with respect to an observer.
Which among the following instruments is used to measure either direct or alternating electric current?
(A) Wattmeter
(B) Hygrometer
(C) Ammeter
(D) Pyrometer
1. The device which is used to measure electric current in an electric circuit is called ammeter.
2. The resistance of an ideal ammeter is always zero and the electric circuit is always connected in series.
The induced current is the highest when the direction of motion of the coil is:
(A) not at right angles to the magnetic field
(B) at right angles to the electricity
(C) at right angles to the electric source
(D) at right angles to the magnetic field
1. Induced current is highest when the direction of motion of the coil is perpendicular to the magnetic field.
Which of the following is correct about uniform acceleration?
(A) An object moving on friction-less surface can gain uniform acceleration.
(B) An object under free fall is an example of uniform acceleration.
(C) An object moving with constant speed is an example of uniform acceleration.
(D) Motion of a spring is an example of uniform acceleration.
1. The change in velocity of an object at equal time intervals is called uniform acceleration.
2. A freely falling object is an example of uniform acceleration.
Identify the correct statement.
(A) Newton is a unit of force.
(B) Newton is a unit of power.
(C) Joule is a unit of force.
(D) Joule is a unit of power.
1. Newton is the SI unit of force. It is a unit force that causes an acceleration of one meter per second on one kilogram of mass.
- Force can be defined as:
Force =Mass x Acceleration
2. Joule is the SI unit of energy and work. It is the unit work done by one Newton force over a distance of one meter.
- Energy can be defined as:
Energy = Work x Time
Refraction of light is responsible for:
(A) Shadow formation
(B) Twinkling of stars
(C) Blue color of the sky
(D) Rainbow
The amount of work done in moving a charge of 4C across two points having a potential difference of 6V is ______.
(A) 48 J
(B) 12 J
(C) 36 J
(D) 24 J
The splitting of white light into its component colours is called ______.
(A) refraction
(B) reflection
(C) scattering
(D) Dispersion
According to Dalton’s atomic theory, atoms combine in the ratio of small whole numbers to form ______.
(A) Neutrons
(B) Molecules
(C) Protons
(D) Compounds
1. According to Dalton's atomic theory, atoms combine in small whole-number proportions to form compounds.
Match the columns.
Column - A Column-B
I. Electric current a. Henry
II. Potential difference b. Farad
III. Gapacitance c. Volt
IV. inductance d. Ampere
(A) i-a, ii-b, iii-c, iv-d
(B) i-b, ii-a, iii-c, iv-d
(C) i-d, ii-c, iii-b, iv-a
(D) i-a, ii-c, iii-b, iv-d
The columns are a correct match.
I. Electric current - Ampere
II. Potential difference - c. Volt
III. Gapacitance - b. Farad
IV. inductance - a. Henryd.
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