1777 + Mcqs in Science Page 31 McqOptions

1501.	Which labelled cell is found in the nervous system?
A.	Only P
B.	Only Q
C.	Only R
D.	Only S
Answer» B. Only Q

Discussion

1502.	Which one of the following organelles is not present in animal cells?
A.	Nucleus
B.	Mitochondria
C.	Plastids
D.	Centrioles
E.	None of these
Answer» D. Centrioles

Discussion

1503.	The husk of the coconut is made up of which type of tissues?
A.	Collenchyma
B.	Sclerenchyma
C.	Apical meristem
D.	Intercalary meristem
E.	None of these
Answer» C. Apical meristem

Discussion

1504.	Which one of the following cell organelles is known as suicidal bag?
A.	Ribosome
B.	Lysosome
C.	Golgi apparatus
D.	Mitochondria
E.	None of these
Answer» C. Golgi apparatus

Discussion

1505.	A given sample of sulphur contains 0.25 mol of sulphur molecules. The number of moles of sulphur atoms, number of sulphur molecules and number of sulphur atoms present in the given sample are respectively
A.	\[\text{6}\text{.023}\times \text{1}{{\text{0}}^{\text{23}}}\text{, 3 and 3}\text{.2}\times \text{1}{{\text{0}}^{\text{23}}}\]
B.	\[\text{2, 3}\text{.2}\times \text{1}{{\text{0}}^{\text{23}}}\text{ and 6}\text{.02}\times \text{1}{{\text{0}}^{\text{23}}}\]
C.	\[\text{2, 1}\text{.5}\times \text{1}{{\text{0}}^{\text{23}}}\text{ and 1}\text{.2}\times \text{1}{{\text{0}}^{\text{24}}}\]
D.	\[\text{1}\text{.2}\times \text{1}{{\text{0}}^{\text{24}}}\text{, 3}\text{.2}\times \text{1}{{\text{0}}^{23}}\text{ and 2}\]
Answer» D. \[\text{1}\text{.2}\times \text{1}{{\text{0}}^{\text{24}}}\text{, 3}\text{.2}\times \text{1}{{\text{0}}^{23}}\text{ and 2}\]

Discussion

1506.	Which one of the following meristematic tissue causes the elongation of roof and stem?
A.	Apical meristems
B.	Lateral meristems
C.	Intercalary meristems
D.	All the above
E.	None of these
Answer» B. Lateral meristems

Discussion

1507.	Which one of the following meristematic tissue causes the organ to increase in diameter and girth?
A.	Apical meristems
B.	Lateral meristems
C.	Intercalary meristems
D.	All the above
E.	None of these
Answer» C. Intercalary meristems

Discussion

1508.	Which of the following is NOT a divalent ion?
A.	Sulphate
B.	Nitrate
C.	Hydrogen phosphate
D.	Carbonate
Answer» C. Hydrogen phosphate

Discussion

1509.	Calculate the number of iron atoms in a piece of iron weighing 2.8 g.(Atomic mass of iron\[=56\])
A.	\[30.11\times {{10}^{23}}\]atoms
B.	\[3.11\times {{10}^{23}}\]atoms
C.	\[3.0115\times {{10}^{22}}\]atoms
D.	\[301.1\times {{10}^{23}}\]atoms
Answer» D. \[301.1\times {{10}^{23}}\]atoms

Discussion

1510.	Symbol of nucleus with atomic number 18 and mass number 40 is written as:
A.	\[_{18}^{40}R\]
B.	\[_{18}^{40}Ar\]
C.	\[_{40}^{18}Ar\]
D.	40 Ar 18
E.	None of these
Answer» C. \[_{40}^{18}Ar\]

Discussion

1511.	What is the full form of IUPAC?
A.	International Union of Pure and Applied Chemistry
B.	International Union Power of Applied Chemistry
C.	Internal Union of Pure Applied Chemistry
D.	International Universal Pure and Applied Chemistry
E.	None of these
Answer» B. International Union Power of Applied Chemistry

Discussion

1512.	Which of the following is the chemical formula of sodium chloride?
A.	\[C{{l}_{2}}\]
B.	\[NaCl\]
C.	\[FeCl\]
D.	\[CaCl\]
E.	None of these
Answer» C. \[FeCl\]

Discussion

1513.	How many moles are present in \[540\,\,g\] of glucose\[({{C}_{6}}{{H}_{12}}{{O}_{6}})\]?
A.	\[2\]moles
B.	\[3\]moles
C.	\[4\]moles
D.	\[1\]mole
Answer» C. \[4\]moles

Discussion

1514.	Calculate the mass of water which contains the same number of molecules as are contained in 60 g of oxygen.
A.	60.8 g
B.	30.75 g
C.	33.75 g
D.	76.5 g
E.	None of these
Answer» D. 76.5 g

Discussion

1515.	Quicklime contains:
A.	Sodium and hydrogen only
B.	Calcium and oxygen
C.	Oxygen and hydrogen only
D.	Potassium and sulphur
E.	None of these
Answer» C. Oxygen and hydrogen only

Discussion

1516.	In which of the following types of chromosome the centromere occupies one end of the chromosome?
A.	Metacentric
B.	Telocentric
C.	Acrocentric
D.	Submetacentric
E.	None of these
Answer» C. Acrocentric

Discussion

1517.	Name the remaining fluid which is left when protein fibrinogen is removed from plasma.
A.	Lymph
B.	Blood
C.	Serum
D.	Plasma complex
E.	None of these
Answer» D. Plasma complex

Discussion

1518.	Read the given statements and select the correct option. Statement 1: If a rocket explodes in mid air, its kinetic energy increases. Statement 2: Chemical energy of the fuel provides additional kinetic energy to the fragments.
A.	Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B.	Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C.	Statement 1 is true but statement 2 is false.
D.	Both statements 1 and 2 are false.
Answer» C. Statement 1 is true but statement 2 is false.

Discussion

1519.	Consider the following statements and select the correct option which identifies true (T) and false (F).(i) When a body thrown up, its kinetic energy gradually changes into potential energy.(ii) When a body falls from a certain height, its potential energy remains the same.(iii) If two unequal masses have the same momentum, then the heavier body possesses lesser kinetic energy.
A.	(i)(ii)(iii)TFT
B.	(i)(ii)(iii)FTF
C.	(i)(ii)(iii)TTF
D.	(i)(ii)(iii)FFT
Answer» B. (i)(ii)(iii)FTF

Discussion

1520.	A body moves under a variable force. For the body a plot of velocity versus time is shown in figure. The correct statement is
A.	In moving from C to D, work done by the force on the body is positive
B.	In moving from 6 to C, work done by the force on the body is positive
C.	In moving from A to B, the body does work on the system
D.	In moving from O to A, work done by the body and is negative.
Answer» B. In moving from 6 to C, work done by the force on the body is positive

Discussion

1521.	Potential energy of an object at a height h is\[{{E}_{p}}=mgh\]. This equation is true only if(i) The acceleration due to gravity is constant.(ii) The potential energy is path dependent.
A.	Only (i) is true.
B.	Only (ii) is true.
C.	Both (i) and (ii) are false
D.	Both (i) and (ii) are true.
Answer» B. Only (ii) is true.

Discussion

1522.	A mass of M kg is suspended by a weightless string. The horizontal force that is required to displace it until the string making an angle of \[45{}^\circ \] with the initial vertical direction is
A.	\[Mg(\sqrt{2}-1)\]
B.	\[Mg(\sqrt{2}+1)\]
C.	\[Mg\sqrt{2}\]
D.	\[\frac{Mg}{\sqrt{2}}\]
Answer» B. \[Mg(\sqrt{2}+1)\]

Discussion

1523.	A skier of mass 50 kg stands at point P at the top of the ski jump and moves from P to Q and takes off his jump at Q as shown in figure. If 50% of the change in the gravitational potential energy of the skier between points P and Q becomes the kinetic energy at Q then the speed at which the skier arrives at Q is
A.	\[10\text{ m }{{\text{s}}^{-1}}\]
B.	\[20\text{ m }{{\text{s}}^{-1}}\]
C.	\[30\text{ m }{{\text{s}}^{-1}}\]
D.	\[40\text{ m }{{\text{s}}^{-1}}\]
Answer» C. \[30\text{ m }{{\text{s}}^{-1}}\]

Discussion

1524.	Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine? \[(g=10\text{ }m/{{s}^{2}})\]
A.	12.3 kW
B.	7.0 kW
C.	8.1 kW
D.	10.2 kW
Answer» D. 10.2 kW

Discussion

1525.	A body of mass 2 kg is thrown up vertically with a kinetic energy of 490 J. If the acceleration due to gravity is \[9.8\text{ }m\text{ }{{s}^{-2}}\], the height at which the kinetic energy of the body becomes half of the original value is
A.	50 m
B.	25 m
C.	12.5 m
D.	10 m.
Answer» D. 10 m.

Discussion

1526.	Read the given statements and select the correct option. Statement 1: If a light body and a heavy body possess the same momentum, the lighter body will possess more kinetic energy. Statement 2: The kinetic energy of a body varies as the square of its velocity.
A.	Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B.	Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C.	Statement 1 is true but statement 2 is false.
D.	Both statements 1 and 2 are false.
Answer» C. Statement 1 is true but statement 2 is false.

Discussion

1527.	When a light and a heavy body have equal K.E, then which one has a greater momentum?
A.	light body
B.	heavy body
C.	both have equal momentum
D.	uncertain
Answer» C. both have equal momentum

Discussion

1528.	The mass of a body is increased by \[100%\] and velocity of a body is decreased by\[50%\]. What is the percentage change in its kinetic energy?
A.	\[50%\]
B.	\[-50%\]
C.	\[75%\]
D.	\[150%\]
Answer» C. \[75%\]

Discussion

1529.	A 1 kg mass falls from a height of 10 m into a sand box. What is the speed of the mass just before hitting the sand box? If it travels a distance of 2 cm into the sand before coming to rest, what is the average retarding force?
A.	12 m/sec and 3600N
B.	14 m/sec and 4900N
C.	16 m/sec and 6400N
D.	18 m/sec and 8100N
Answer» C. 16 m/sec and 6400N

Discussion

1530.	A lorry and a car with the same kinetic energy are brought to rest by the application of brakes which provide equal retarding forces. Which of them will come to rest in a shorter distance?
A.	Lorry
B.	Car
C.	Both will stop at the same distance
D.	Car stops first but takes longer distance.
Answer» D. Car stops first but takes longer distance.

Discussion

1531.	What energy does the person possess while climbing a hill?
A.	Only\[P.E.\]
B.	Only\[K.E.\]
C.	Only muscular energy
D.	Both [a] and [b]
Answer» E.

Discussion

1532.	1 hp is equal to
A.	0.746 kW
B.	7.46 kW
C.	74.6 kW
D.	746 kW
Answer» B. 7.46 kW

Discussion

1533.	In which of the following applications is work NOT done?
A.	Shopping in the supermarket
B.	Standing with a basket of fruits on the head
C.	Climbing a tree to pluck fruits
D.	Pushing a wheelbarrow of bricks
Answer» C. Climbing a tree to pluck fruits

Discussion

1534.	Find the kinetic energy of a ball of mass\[200\,\,g\] moving at a speed of\[20\,\,cm\,\,{{s}^{-1}}\].
A.	\[0.4\,\,J\]
B.	\[0.004\,\,J\]
C.	\[0.001\,\,J\]
D.	\[0.01\,\,J\]
Answer» C. \[0.001\,\,J\]

Discussion

1535.	A \[20\,\,kg\] ball is thrown upwards with a speed of\[6\,\,m\,\,{{s}^{-1}}\]. Find the maximum height it reaches\[(g=9.8\,\,m\,\,{{s}^{-2}})\].
A.	\[2.86\,\,m\]
B.	\[1.88\,\,m\]
C.	\[3.82\,\,m\]
D.	\[1.84\,\,m\]
Answer» E.

Discussion

1536.	A machine, which is 75 percent efficient uses 12 joules of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through that distance. What will its velocity be at the end of its fall?
A.	\[\sqrt{\text{32}}\text{ m}/\text{s}\]
B.	\[\sqrt{\text{24}}\text{ m}/\text{s}\]
C.	\[\sqrt{\text{l8}}\text{ m}/\text{s}\]
D.	\[\sqrt{\text{9}}\text{ m}/\text{s}\]
Answer» D. \[\sqrt{\text{9}}\text{ m}/\text{s}\]

Discussion

1537.	Three different stones \[P,\,\,Q\] and \[R\] of different weights are lifted from the ground level to different heights on different planets as given below: P: A 250 g stone is lifted to 10 m on the Earth. Q: A 800 g stone is lifted to 2 m on Saturn. R: A 1kg stone is lifted to 1 m on Jupiter. Which of the following statements is true? (Given that the acceleration due to gravity on the Earth, the Saturn and the Jupiter are \[10\,\,m\,\,{{s}^{-2}},\,\,15\,\,m\,\,{{s}^{-2}}\] and \[25\,\,m\,\,{{s}^{-2}}\] respectively).
A.	More energy is required to lift stone \[Q\] than stone\[P\].
B.	More energy is required to lift stone \[P\] than stone\[R\].
C.	Stone \[P\] and stone \[Q\] require the same amount of energy.
D.	Stone \[P\] and stone \[R\] require the same amount of energy.
Answer» E.

Discussion

1538.	In question No. 50, the potential energy of the balloon
A.	decreases by \[mgh\]
B.	increases by \[mgh\]
C.	increases by \[mg(1-h)\]
D.	increases by \[mgl\]
Answer» C. increases by \[mg(1-h)\]

Discussion

1539.	A neutron travelling with a velocity v and kinetic energy E collides perfectly elastically head on with the nucleus of an atom of mass number A at rest. The fraction of total energy retained by the neutron is
A.	\[{{\left( \frac{A-1}{A+1} \right)}^{2}}\]
B.	\[{{\left( \frac{A+1}{A-1} \right)}^{2}}\]
C.	\[{{\left( \frac{A-1}{A} \right)}^{2}}\]
D.	\[{{\left( \frac{A+1}{A} \right)}^{2}}\]
Answer» B. \[{{\left( \frac{A+1}{A-1} \right)}^{2}}\]

Discussion

1540.	When speed of the moving object is doubled its
A.	acceleration is doubled
B.	momentum becomes four times more
C.	K. E. is increased to four times
D.	potential energy is increased
Answer» D. potential energy is increased

Discussion

1541.	The kinetic energy acquired by a mass m after travelling a fixed distance from rest under the action of constant force is
A.	directly proportional to\[\sqrt{m}\]
B.	directly proportional to m
C.	independent of m
D.	directly proportional to \[\frac{1}{\sqrt{m}}\]
Answer» D. directly proportional to \[\frac{1}{\sqrt{m}}\]

Discussion

1542.	A chain is held on a frictionless table with one third of its length hanging over the edge. The total length of the chain is 1 and its mass is m. The work required to pull the hanging part back to the table is
A.	\[2mgl\]
B.	\[\frac{mgl}{5}\]
C.	\[\frac{mgl}{9}\]
D.	\[\frac{mgl}{18}\]
Answer» E.

Discussion

1543.	A man has fallen into a ditch of width d and two of his friends are slowly pulling him out using a light rope and two fixed pulleys as shown in the figure. What is the force (assumed equal for both the friends) exerted by each friends on the slope?
A.	\[\frac{mg}{4h}\sqrt{{{d}^{2}}+4{{h}^{2}}}\]
B.	\[\frac{mg}{4h}\times d\]
C.	\[\frac{mg}{4h}\times \sqrt{{{d}^{2}}+4{{h}^{2}}}\]
D.	\[\frac{mgh}{d}\]
Answer» B. \[\frac{mg}{4h}\times d\]

Discussion

1544.	Which one of the following statements is correct? Statement 1: Sound waves are longitudinal waves. Statement 2: Sound waves have low frequency and long wavelength.
A.	Statement 1
B.	Statement 2
C.	Both statements are correct
D.	Both statements are incorrect
Answer» D. Both statements are incorrect

Discussion

1545.	Which of the following is the S.I. unit of force?
A.	Newton
B.	Meter
C.	Joule
D.	Ampere
Answer» B. Meter

Discussion

1546.	A ball weighing \[\frac{1}{2}\] kg has a kinetic energy 1 joule when its speed is:
A.	1 m/s
B.	2 m/s
C.	3 m/s
D.	4 m/s
Answer» C. 3 m/s

Discussion

1547.	What kind of energy is present in a rotating wheel?
A.	Kinetic energy
B.	Electrical energy
C.	Potential energy
D.	Wind energy
Answer» B. Electrical energy

Discussion

1548.	Which among the following is represented by Force \[\times \] Displacement?
A.	Frequency
B.	Work done
C.	Speed
D.	Time
Answer» C. Speed

Discussion

1549.	A man pushing a computer by applying a force of 15 N. Find the work done by this force in displacing the computer through 20 cm along the direction of the push.
A.	300 J
B.	3 N
C.	3.4 J
D.	3 J
Answer» E.

Discussion

1550.	A man of mass 86 kg climbs 40 steps of a staircase, each measuring \[15\,cm\] high. The potential energy gained by the boy is: \[[g=9.8\,m/{{s}^{2}}]\]
A.	5000 J
B.	5056.8 J
C.	6000 J
D.	500 J
Answer» C. 6000 J

Discussion

Explore topic-wise MCQs in 9th Class.

Which labelled cell is found in the nervous system?

Which one of the following organelles is not present in animal cells?

The husk of the coconut is made up of which type of tissues?

Which one of the following cell organelles is known as suicidal bag?

A given sample of sulphur contains 0.25 mol of sulphur molecules. The number of moles of sulphur atoms, number of sulphur molecules and number of sulphur atoms present in the given sample are respectively

Which one of the following meristematic tissue causes the elongation of roof and stem?

Which one of the following meristematic tissue causes the organ to increase in diameter and girth?

Which of the following is NOT a divalent ion?

Calculate the number of iron atoms in a piece of iron weighing 2.8 g.(Atomic mass of iron\[=56\])

Symbol of nucleus with atomic number 18 and mass number 40 is written as:

What is the full form of IUPAC?

Which of the following is the chemical formula of sodium chloride?

How many moles are present in \[540\,\,g\] of glucose\[({{C}_{6}}{{H}_{12}}{{O}_{6}})\]?

Calculate the mass of water which contains the same number of molecules as are contained in 60 g of oxygen.

Quicklime contains:

In which of the following types of chromosome the centromere occupies one end of the chromosome?

Name the remaining fluid which is left when protein fibrinogen is removed from plasma.

Read the given statements and select the correct option. Statement 1: If a rocket explodes in mid air, its kinetic energy increases. Statement 2: Chemical energy of the fuel provides additional kinetic energy to the fragments.

A body moves under a variable force. For the body a plot of velocity versus time is shown in figure. The correct statement is

Potential energy of an object at a height h is\[{{E}_{p}}=mgh\]. This equation is true only if(i) The acceleration due to gravity is constant.(ii) The potential energy is path dependent.

A mass of M kg is suspended by a weightless string. The horizontal force that is required to displace it until the string making an angle of \[45{}^\circ \] with the initial vertical direction is

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine? \[(g=10\text{ }m/{{s}^{2}})\]

A body of mass 2 kg is thrown up vertically with a kinetic energy of 490 J. If the acceleration due to gravity is \[9.8\text{ }m\text{ }{{s}^{-2}}\], the height at which the kinetic energy of the body becomes half of the original value is

Read the given statements and select the correct option. Statement 1: If a light body and a heavy body possess the same momentum, the lighter body will possess more kinetic energy. Statement 2: The kinetic energy of a body varies as the square of its velocity.

When a light and a heavy body have equal K.E, then which one has a greater momentum?

The mass of a body is increased by \[100%\] and velocity of a body is decreased by\[50%\]. What is the percentage change in its kinetic energy?

A 1 kg mass falls from a height of 10 m into a sand box. What is the speed of the mass just before hitting the sand box? If it travels a distance of 2 cm into the sand before coming to rest, what is the average retarding force?

A lorry and a car with the same kinetic energy are brought to rest by the application of brakes which provide equal retarding forces. Which of them will come to rest in a shorter distance?

What energy does the person possess while climbing a hill?

1 hp is equal to

In which of the following applications is work NOT done?

Find the kinetic energy of a ball of mass\[200\,\,g\] moving at a speed of\[20\,\,cm\,\,{{s}^{-1}}\].

A \[20\,\,kg\] ball is thrown upwards with a speed of\[6\,\,m\,\,{{s}^{-1}}\]. Find the maximum height it reaches\[(g=9.8\,\,m\,\,{{s}^{-2}})\].

A machine, which is 75 percent efficient uses 12 joules of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through that distance. What will its velocity be at the end of its fall?

In question No. 50, the potential energy of the balloon

A neutron travelling with a velocity v and kinetic energy E collides perfectly elastically head on with the nucleus of an atom of mass number A at rest. The fraction of total energy retained by the neutron is

When speed of the moving object is doubled its

The kinetic energy acquired by a mass m after travelling a fixed distance from rest under the action of constant force is

A chain is held on a frictionless table with one third of its length hanging over the edge. The total length of the chain is 1 and its mass is m. The work required to pull the hanging part back to the table is

A man has fallen into a ditch of width d and two of his friends are slowly pulling him out using a light rope and two fixed pulleys as shown in the figure. What is the force (assumed equal for both the friends) exerted by each friends on the slope?

Which one of the following statements is correct? Statement 1: Sound waves are longitudinal waves. Statement 2: Sound waves have low frequency and long wavelength.

Which of the following is the S.I. unit of force?

A ball weighing \[\frac{1}{2}\] kg has a kinetic energy 1 joule when its speed is:

What kind of energy is present in a rotating wheel?

Which among the following is represented by Force \[\times \] Displacement?

A man pushing a computer by applying a force of 15 N. Find the work done by this force in displacing the computer through 20 cm along the direction of the push.

A man of mass 86 kg climbs 40 steps of a staircase, each measuring \[15\,cm\] high. The potential energy gained by the boy is: \[[g=9.8\,m/{{s}^{2}}]\]