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Science M.C.Q. [I MARKS]

Some Natural Phenomena · Jharkhand Board (JAC) STD 8 (Jharkhand - English Medium). 21 questions.

Questions

M.C.Q. [I MARKS]

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21 questions · auto-graded multiple-choice test.

MCQ 11 Mark
The waves generated by the earthquake tremors are called:
  • A
    Ultrasonic waves.
  • B
    Rhythmic waves.
  • C
    Systemic waves.
  • ✓
    Seismic waves.
Answer
Correct option: D.
Seismic waves.
Explanation:
The tremors produce waves on the surface of the earth. These are called seismic waves. These waves are recorded by the seismograph.
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MCQ 21 Mark
When an object gets negatively charged by the process of friction, then:
  • A
    The object loses some electrons.
  • B
    The object loses some protons.
  • ✓
    The object gains some electrons.
  • D
    The object gains some protons.
Answer
Correct option: C.
The object gains some electrons.
Explanation:
The electric charges generated by rubbing are static electric charges. There are two types of charges: Positive charge and negative charge.
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MCQ 31 Mark
When a plastic comb is rubbed with dry hair, the hair get positively charged by friction. In this porcess:
  • A
    The hair loses some positive protons.
  • ✓
    The hair gain some positive protons.
  • C
    The hair loses some negative electrons.
  • D
    The hair gain some negative electrons.
Answer
Correct option: B.
The hair gain some positive protons.
Explanation:
The combing of hair make the comb negatively charged. It is able to attract tiny pieces of paper which are neutral.
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MCQ 41 Mark
The magnitude of an earthquake is measured on:
  • A
    Celsius scale.
  • B
    Kelvin scale.
  • C
    Decibel scale.
  • ✓
    Richter scale.
Answer
Correct option: D.
Richter scale.
The magnitude (or intensity) of an earthquake is expressed in terms of Richter scale. The destructive earthquakes have magnitudes higher than $7$ on the Richter scale.
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MCQ 51 Mark
The device used for detecting charge (positive or negative) on an object is called:
  • A
    Stethoscope.
  • B
    Telescope
  • C
    Kaleidoscope.
  • ✓
    Electroscope.
Answer
Correct option: D.
Electroscope.
Explanation:
Electroscope is the device which is used to detect charge on a body. It is used for detecting, measuring and finding the nature of a charge.
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MCQ 61 Mark
The tremendous electric charges in the atmosphere which produce sheet lightning in the clouds are produced by the process of:
  • ✓
    Friction.
  • B
    Induction.
  • C
    Conduction.
  • D
    Convection.
Answer
Correct option: A.
Friction.
Explanation:
The process of electric discharge between clouds and the earth or between different clouds causes lightning.
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MCQ 71 Mark
An earthquake of magnitude $2$ on Richter scale is:
  • A
    Two times as strong as an earthquake of magnitude $1.$
  • B
    Four times as strong as an earthquake of magnitude $1.$
  • ✓
    Ten times as strong as an earthquake of magnitude $1.$
  • D
    Hundred times as strong as an earthquake of magnitude $1.$
Answer
Correct option: C.
Ten times as strong as an earthquake of magnitude $1.$
The magnitude (or intensity) of an earthquake is expressed in terms of Richter scale. The destructive earthquakes have magnitudes higher than $7$ on the Richter scale.
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MCQ 81 Mark
The place inside the earth's crust where the earthquake is generated is called:
  • A
    Seismic zone of the earth.
  • B
    Epicentre of the earthquake.
  • C
    Fault zone of the earth.
  • ✓
    Focus of the earthquake.
Answer
Correct option: D.
Focus of the earthquake.
Explanation:
Focus of an earthquake is located deep under the ground. Focus is the point inside the crust where the pressure is released. The point on the earth's surface above the focus is called the epicenter.
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MCQ 91 Mark
Lightning can even burn up a tree. Lightning contains a tremendous amount of:
  • A
    Heat energy.
  • ✓
    Electric energy.
  • C
    Chemical energy.
  • D
    Nuclear energy.
Answer
Correct option: B.
Electric energy.
Explanation:
Lightening is the name given to the flash of light which occurs in the sky during the rainy season. The process of electric discharge between clouds and the earth or between different clouds causes lightning.
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MCQ 101 Mark
Lightning can even burn up a tree. Lightning contains a tremendous amount of:
  • A
    Heat energy.
  • ✓
    Electric energy.
  • C
    Chemical energy.
  • D
    Nuclear energy.
Answer
Correct option: B.
Electric energy.
Explanation:
Lightening is the name given to the flash of light which occurs in the sky during the rainy season. The process of electric discharge between clouds and the earth or between different clouds causes lightning.
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MCQ 111 Mark
Which of the following cannot be charged by friction, if held by hand?
  • A
    Plastic scale.
  • ✓
    A copper rod.
  • C
    An inflated balloon.
  • D
    A woollen cloth.
Answer
Correct option: B.
A copper rod.
Explanation:
All of the above substances are insulators whereas Copper rod is a conductor. As soon as we charge a copper rod by rubbing with another material, the electric charge flow through our hand and body and flows into the earth. As a result, the copper rod remains uncharged.
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MCQ 121 Mark
A charged object attracts an uncharged object by producing opposite charges in the nearer end of the uncharged object by the process of:
  • A
    Electric potential.
  • B
    Electric induction.
  • ✓
    Friction.
  • D
    Electromagnetic induction.
Answer
Correct option: C.
Friction.
Explanation:
The electric charges generated by rubbing are static electric charges. These electric charges remain bound on the surface of the charged object.
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MCQ 131 Mark
Which of the following are transferred from one object to another when these two objects are charged by friction?
  • A
    Atoms.
  • B
    Protons.
  • ✓
    Neutrons.
  • D
    Electrons.
Answer
Correct option: C.
Neutrons.
Explanation:
The electric charges generated by rubbing are static electric charges. There are two types of charges: Positive charge and negative charge.
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MCQ 141 Mark
When a glass rod is rubbed with a piece of silk cloth, then:
  • A
    The glass rod and silk cloth both acquire positive charge.
  • ✓
    The glass rod becomes positively charged while the silk cloth has a negative charge.
  • C
    The glass rod and silk cloth both acquire negative charge.
  • D
    The glass rod becomes negatively charged while the silk cloth has a positive charge.
Answer
Correct option: B.
The glass rod becomes positively charged while the silk cloth has a negative charge.
Explanation:
After rubbing the glass rod with silk cloth, the glass rod becomes positively charged. The silk cloth becomes negatively charged. The electric charges generated by rubbing are static electric charges. These electric charges remain bound on the surface of the charged object.
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MCQ 151 Mark
Which of the following area of India is not the most threatened by earthquakes?
  • A
    North-East.
  • B
    Kashmir.
  • ✓
    West Bengal.
  • D
    Rajasthan.
Answer
Correct option: C.
West Bengal.
Explanation:
The states in India where earthquakes are most likely to occur are Kashmir, Western and Central Himalayas, the whole of North-East, Rann of Kutch, Rajasthan and the Indo Gangetic Plane.
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MCQ 161 Mark
A plastic comb is rubbed with dry hair whereas a glass rod is rubbed with a piece of silk cloth. Which of these will get negatively charged?
$A.$ Plastic comb.
$B.$ Glass rod.
$C.$ Dry hair.
$D.$ Silk cloth.
  • A
    $A$ and $B$
  • B
    $B$ and $C$
  • ✓
    $A$ and $D$
  • D
    $B$ and $D$
Answer
Correct option: C.
$A$ and $D$
After rubbing the glass rod with silk cloth, the glass rod becomes positively charged. The silk cloth becomes negatively charged. When a plastic comb is dry hair, it becomes negatively charged. The negatively charged comb induces a positive charge on the pieces of paper which are neutral in nature.
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MCQ 171 Mark
The electric nature of lightning was established by a scientist named:
  • A
    Isaac Newton.
  • B
    Robert Hooke.
  • ✓
    Benjamin Franklin.
  • D
    Thales.
Answer
Correct option: C.
Benjamin Franklin.
Explanation:
Benjamin Franklin is the scientist who showed that lightening is electric in nature. He discovered many things about lightening and was the first to show that a thunderstorm lets out electricity.
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MCQ 181 Mark
An inflated rubber balloon is rubbed with a woollen cloth whereas a ballpoint pen refill is rubbed with a polythene bag. Which of these will get positively charged?
$A.$ Inflated rubber balloon.
$B.$ Woollen cloth.
$C.$ Ballpoint pen refill.
$D.$ Polythene bag.
  • A
    $A$ and $B$
  • ✓
    $B$ and $C$
  • C
    $A$ and $D$
  • D
    $B$ and $D$
Answer
Correct option: B.
$B$ and $C$
A ballpoint pen refill can be charged by rubbing it against the wool cloth. It becomes negatively charged.
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MCQ 191 Mark
A lightning conductor is a device which transfers:
  • A
    Electric energy.
  • ✓
    Light energy.
  • C
    Solar energy.
  • D
    Photoelectric energy.
Answer
Correct option: B.
Light energy.
Explanation:
Lightening conductor is a device which is used to protect a tall building from lightening. A metallic rod, taller than the building, is installed in the walls of the building during its construction.
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MCQ 201 Mark
The epicentre of an earthquake is:
  • ✓
    Deep under the crust of earth.
  • B
    In the mantle of earth.
  • C
    On the surface of earth.
  • D
    In the core of earth.
Answer
Correct option: A.
Deep under the crust of earth.
Explanation:
Focus of an earthquake is located deep under the ground. Focus is the point inside the crust where the pressure is released. The point on the earth's surface above the focus is called the epicenter.
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MCQ 211 Mark
Which of the following part of the earth is made up of molten iron?
  • A
    Mantle.
  • ✓
    Inner core.
  • C
    Outer core.
  • D
    Crust.
Answer
Correct option: B.
Inner core.
Explanation:
The outer core is the layer surrounding the inner core. It is a liquid layer. It is also made up of iron and nickel.
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