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All Grades / Science (1553 questions)
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by GIANSH GUPTA KHUNDKER
· Class 9
Which process causes a red blood cell to shrink and crenate when placed in a hypertonic salt solution?
Science
Atoms and Molecules
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by GIANSH GUPTA KHUNDKER
· Class 9
What structure fails to form during plant cell cytokinesis if the Golgi apparatus is chemically inhibited?
Science
Cell � The Fundamental Unit of Life
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by GIANSH GUPTA KHUNDKER
· Class 9
A particle moves along a straight line so that its displacement s (in metres) at time t (in seconds) is s = t³ - 6t² + 9t + 4. What is the velocity of the particle when its acceleration becomes zero?
Science
Motion
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by RAJANYA MONDAL
· Class 7
What is known as the guardian of genome?
Science
Other
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by GIANSH GUPTA KHUNDKER
· Class 9
An astronaut on a newly discovered planet drops a small 2 kg sphere from a height of 20 m. It takes exactly 4 seconds to hit the ground. The planet is perfectly spherical with a radius equal to half of the Earth's radius. Assuming no air resistance, what is the ratio of the mass of the planet to the mass of the Earth? (Take g on Earth = 10 m/s²)
Science
Other
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by RAJANYA MONDAL
· Class 7
What is another name for an intrinsic membrane protein?
Science
Other
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by RAJANYA MONDAL
· Class 7
What is the main function of the Smooth Endoplasmic Reticulum (SER)?
Science
Other
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by RAJANYA MONDAL
· Class 7
What is the main function of the Rough Endoplasmic Reticulum (RER)?
Science
Other
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by GIANSH GUPTA KHUNDKER
· Class 9
Two bodies with masses M1 and M2 are separated by a distance R, and the gravitational force between them is F. If the mass of the first body is doubled, the mass of the second is halved, and the distance between their centres is reduced to R/2, what will be the new gravitational force?
Science
Atoms and Molecules
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by GIANSH GUPTA KHUNDKER
· Class 9
A sonar device on a submarine sends an ultrasound signal into the ocean. The signal reflects off an underwater reef and is detected by the submarine's receiver exactly 2.4 seconds later. If the speed of sound in seawater is 1500 m/s, how far away is the reef from the submarine?
Science
Gravitation
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by GIANSH GUPTA KHUNDKER
· Class 9
An element has an atomic number of 13 and a mass number of 27. How many neutrons are present in the nucleus of this atom?
Science
Structure of Atom
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by GIANSH GUPTA KHUNDKER
· Class 9
An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a frictionless horizontal table. What is the net force required to keep the object moving with the same velocity?
Science
Force and Laws of Motion
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by GIANSH GUPTA KHUNDKER
· Class 9
The value of the Universal Gravitational Constant (G) was first experimentally determined by:
Science
Gravitation
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by GIANSH GUPTA KHUNDKER
· Class 9
A ball is thrown vertically upwards. At the highest point of its trajectory, its velocity and acceleration are:
Science
Gravitation
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by GIANSH GUPTA KHUNDKER
· Class 9
The gravitational force between two objects depends on the product of their masses and:
Science
Gravitation
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by GIANSH GUPTA KHUNDKER
· Class 9
An object weighs 60 N on Earth. What will be its approximate weight on the Moon?
Science
Gravitation
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by GIANSH GUPTA KHUNDKER
· Class 9
The value of acceleration due to gravity (g):
Science
Gravitation
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by GIANSH GUPTA KHUNDKER
· Class 9
If the distance between two masses is doubled, the gravitational force between them becomes:
Science
Gravitation
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by JOSEPH PREM ZURISHADDAI RAJ
· Class 4
Select the odd one out: ovary, style, stigma, anther
Science
Plants
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by RAJANYA MONDAL
· Class 7
Suppose the cell membrane suddenly stopped controlling what enters and leaves the cell. What would be the most serious consequence?
Science
Other
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