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Science MCQ (1 Marks)

Motion and Time · CBSE STD 7 (CBSE - English Medium). 157 questions.

Questions · Page 2 of 4

MCQ (1 Marks)

MCQ 511 Mark
The earliest clocks made by Egyptians in year $800 \ BC$ for measuring time was:
  • ✓
    Sundial
  • B
    Compass
  • C
    Stop watch
  • D
    Pendulum clock
Answer
Correct option: A.
Sundial
Sundial was the earliest clock made by the Egyptians in year $800 \ BC$ to measure time.
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MCQ 521 Mark
A car covers $40\ km$ in first hour, $115\ km$ in next two hours and $45\ km$ in next one hours. Find out its averages speed:
  • A
    $100\ km/ h$
  • B
    $66.6\ km/ h$
  • ✓
    $50\ km/ h$
  • D
    None of these
Answer
Correct option: C.
$50\ km/ h$

The total averages speed of a car is $50\ km/ h.$

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MCQ 531 Mark
The distance travelled by the vehicles is recorded by:
  • A
    Monometer
  • ✓
    Odometer
  • C
    Speedometer
  • D
    Motometer
Answer
Correct option: B.
Odometer
speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
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MCQ 541 Mark
The time taken by a pendulum of given length to complete one oscillation is:
  • A
    Different at different times.
  • ✓
    Same at all times.
  • C
    Increases at different times.
  • D
    Decreases at different times.
Answer
Correct option: B.
Same at all times.
Same at all times.
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MCQ 551 Mark
Which of the following relations is correct?
  • A
    Speed $=$ Distance $\times $ Time
  • ✓
    $\text{Speed}=\frac{\text{Distance}}{\text{Time}}$
  • C
    $\text{Speed}=\frac{\text{Time}}{\text{Distance}}$
  • D
    $\text{Speed}=\frac{\text{1}}{\text{Distance}\times\text{Time}}$
Answer
Correct option: B.
$\text{Speed}=\frac{\text{Distance}}{\text{Time}}$
$\text{Speed}=\frac{\text{Distance}}{\text{Time}}$
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MCQ 561 Mark
Distance between two cities is measured in:
  • A
    Metres
  • ✓
    Kilometres
  • C
    Second
  • D
    Kilogram
Answer
Correct option: B.
Kilometres
Distance between two cities is measrued by kilometers.
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MCQ 571 Mark
Gradient of line of displacement $-$ time graph gives the:
  • A
    Acceleration
  • ✓
    Velocity
  • C
    Displacement
  • D
    None of these
Answer
Correct option: B.
Velocity
Slope of line of displacement time graph $=\frac{\text{ds}}{\text{dt}}$
The rate of change of position $i.e.,$ rate of change of displacement with time is called velocity.
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MCQ 581 Mark
The speedometer of a vehicle measures the speed in:
  • A
    $m/ \sec.$
  • B
    $m/ min.$
  • ✓
    $km/ hr.$
  • D
    $km/ min.$
Answer
Correct option: C.
$km/ hr.$
$km/ hr.$
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MCQ 591 Mark
The motion that repeats itself after regular intervals of time can be $......... ($Find the incorrect option$).$
  • A
    To and Fro Motion.
  • B
    Circular Motion.
  • ✓
    Rectilinear Motion.
  • D
    Periodic Motion.
Answer
Correct option: C.
Rectilinear Motion.
Rectilinear Motion.
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MCQ 601 Mark
Measurement of time can be done with the help of a:
  • A
    Meter scale
  • B
    Pulley
  • ✓
    Simple pendulum
  • D
    Speedometer
Answer
Correct option: C.
Simple pendulum
A pendulum is a weight suspended from a pivot so that it can swing freely.
When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position.
When released, the restoring force combined with the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth.
The time for one complete cycle, a left swing and a right swing, is called the period.
The period depends on the length of the pendulum.
This time period when known can be used to measure time.
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MCQ 611 Mark
What determine the nature of the path followed by the particle:
  • A
    Speed
  • B
    Velocity
  • C
    Acceleration
  • ✓
    None
Answer
Correct option: D.
None
Without initial velocity and acceleration path of the particle cannot be decided.
So at a time velocity and acceleration are required to determine the path followed by the particle.
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MCQ 621 Mark
In order to measure very short intervals, we mostly use:
  • A
    Stop clocks
  • B
    stop watches
  • C
    wall clocks
  • ✓
    $A$ and $B$
Answer
Correct option: D.
$A$ and $B$

Stop clocks and stop watches are generally used to measure time for short intervals while wall clocks are used to measure time for long intervals.

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MCQ 631 Mark
The graph between distance, time for a body at rest is a:
  • A
    Straight line parallel to a distance axis.
  • ✓
    Straight line parallel to time axis.
  • C
    Curve line.
  • D
    Straight line.
Answer
Correct option: B.
Straight line parallel to time axis.
Straight line parallel to time axis.
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MCQ 641 Mark
The clock used now a days are:
  • ✓
    Quartz
  • B
    Minute
  • C
    Second
  • D
    All of these
Answer
Correct option: A.
Quartz
These clocks are called quartz clocks.
The time measured by quartz clocks is much more accurate than that by the clocks available earlier.
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MCQ 651 Mark
The most well known periodic motion is that of:
  • A
    Sundial
  • B
    Stop watch
  • ✓
    Simple pendulum
  • D
    Sand clock
Answer
Correct option: C.
Simple pendulum
One of the most well $-$ known periodic motions is that of a simple pendulum.
A simple pendulum consists of a small metallic ball or a piece of stone suspended from a rigid stand by a thread.
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MCQ 661 Mark
When the distance covered by an object is directly proportional to the time interval, it is said to travel with:
  • ✓
    Constant speed
  • B
    Zero velocity
  • C
    Constant acceleration
  • D
    Uniform velocity
Answer
Correct option: A.
Constant speed
When distance is proportional to time, the ratio of distance and time remains constant.
This means that in equal time intervals, the particle is travelling equal distances.
So clearly the speed of the particle remains constant.
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MCQ 671 Mark
Which of the following is used for measuring time?
  • ✓
    Fitbit
  • B
    Playstation
  • C
    Oculus Rift
  • D
    LASER
Answer
Correct option: A.
Fitbit

Fitbit is used for measuring time nowadays.
Playstation is a gaming console, Oculus Rift is a virtual reality headset whereas $LASER$ is a type of light source.

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MCQ 681 Mark
When will a body have zero speed?
  • A
    When a body has uniform acceleration.
  • B
    When a body has non $-$ uniform acceleration.
  • ✓
    When a body is at rest.
  • D
    When a body is under motion.
Answer
Correct option: C.
When a body is at rest.
The distance travelled by a body per unit time is known as speed.
Speed $=\frac{\text{Distance}}{\text{Time}}$
A body has zero speed when it has zero distance covered in an interval of time and hence the body is at rest.
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MCQ 691 Mark
A body in uniform motion covers:
  • A
    Different distances in equal intervals of time.
  • B
    Equal distances in different intervals of time.
  • ✓
    Equal distances in equal intervals of time.
  • D
    Different distances in different intervals of time.
Answer
Correct option: C.
Equal distances in equal intervals of time.
A body is said to be in uniform motion if it covers equal distances in equal intervals of time.
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MCQ 701 Mark
In between starting from one station and stopping at the next, the motion of a train is an example of:
  • A
    Uniform motion.
  • ✓
    Non $-$ uniform motion.
  • C
    Either uniform or non $-$ uniform motion.
  • D
    Neither uniform nor non $-$ uniform motion.
Answer
Correct option: B.
Non $-$ uniform motion.
A train starts from a station, accelerates, reaches its highest speed, slows down $($decelerates$)$ and finally stops at the next station.
So, during its motion between two stations, the train moves with different speeds.
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MCQ 711 Mark
Which of the following does not express a time interval?
  • A
    A day
  • B
    A second
  • C
    A school period
  • ✓
    Time of the first bell in the school
Answer
Correct option: D.
Time of the first bell in the school
Time of the first bell in the school
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MCQ 721 Mark
Observe the given figure.

The time period of a simple pendulum is the time taken by it to travel from:
  • ✓
    $A$ to $8$ and back to $A.$
  • B
    $O$ to $A, A$ to $8$ and $8$ to $A.$
  • C
    $8$ to $A, A$ to $8$ and $8$ to $O.$
  • D
    $A$ to $8.$
Answer
Correct option: A.
$A$ to $8$ and back to $A.$

Time period of a simple pendulum is the total time taken to complete one full cycle.

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MCQ 731 Mark
If the speed of an object along a straight line keeps changing, its motion is said to be:
  • A
    Uniform motion
  • ✓
    Non $-$ uniform motion
  • C
    Linear motion
  • D
    None of these
Answer
Correct option: B.
Non $-$ uniform motion
If the speed of an object moving along a straight line keeps changing, its motion is said to be non uniform motion.
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MCQ 741 Mark
Physical quantity which we can’t obtain from a distance $-$ time graph is:
  • A
    Speed
  • B
    Time taken
  • C
    Change in position
  • ✓
    Velocity
Answer
Correct option: D.
Velocity
Velocity is that physical quantity which can be calculated by finding the slope of a distance $-$ time graph.
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MCQ 751 Mark
The motion of a vibrating particle from one extreme position to another extreme position about its mean position is:
  • A
    Speed
  • B
    Circulation
  • ✓
    Oscillation
  • D
    None of these
Answer
Correct option: C.
Oscillation
The motion of vibrating particle is circulation.
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MCQ 761 Mark
What is a leap year?
  • ✓
    $366$ days
  • B
    $365$ days
  • C
    $364$ days
  • D
    $363$ days
Answer
Correct option: A.
$366$ days
A leap year is a year containing an extra day.
It has $366$ days instead of the normal $365$ days.
The extra day is added in February, which has $29$ days instead of the normal $28$ days.
Leap years occur every $4$ years.
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MCQ 771 Mark
The speed of the vehicle is recorded by.
  • A
    Ammeter
  • B
    Odometer
  • ✓
    Speedometer
  • D
    Voltmeter
Answer
Correct option: C.
Speedometer
Speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.
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MCQ 781 Mark
A car covers a distance of $220\ km$ in $4$ hours what is its speed:
  • A
    $50 \ km/ h$
  • ✓
    $55 \ km/ h$
  • C
    $224 \ km/ h$
  • D
    $880 \ km/ h$
Answer
Correct option: B.
$55 \ km/ h$

The speed of a car is $55\ km/ h.$

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MCQ 791 Mark
Motion of a bus moving on a crowded road is an example of:
  • A
    Uniform motion
  • ✓
    Non $-$ uniform motion
  • C
    Nither uniform or non $-$ uniform motion
  • D
    Neither uniform nor non$-$uniform motion
Answer
Correct option: B.
Non $-$ uniform motion
In a crowded road, moving through different traffic conditions, a bus travels at different speeds at different points of time.
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MCQ 801 Mark
If the velocity of a body does not change with time, its acceleration is:
  • ✓
    Zero
  • B
    Infinite
  • C
    Unity
  • D
    None of these
Answer
Correct option: A.
Zero
Acceleration has to do with changing how fast an object is moving.
If an object is not changing its velocity, then the object is not accelerating.
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MCQ 811 Mark
The distance$-$time graph of an object under uniform motion is a:
  • A
    Curved line
  • ✓
    Straight line
  • C
    Circle
  • D
    Parabola
Answer
Correct option: B.
Straight line
The distance $-$ time graph of an object moving with a uniform speed $($or constant speed$)$ is a straight line.
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MCQ 821 Mark
What is the distance traveled by the body during the first $100$ seconds?
  • ✓
    $200m$
  • B
    $50m$
  • C
    $100m$
  • D
    $25m$
Answer
Correct option: A.
$200m$
According to the graph, the body covers a distance of $100$ metres in first $50$ seconds and then it further covers a distance of $100$ metres in next $50$ seconds in return journey.
Thus, the body covers a total distance of $200$ metres during its motion but the net displacement of the body is zero.
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MCQ 831 Mark
A simple pendulum is an example of:
  • ✓
    Periodic motion
  • B
    Circular motion
  • C
    Linear motion
  • D
    None of these
Answer
Correct option: A.
Periodic motion
Periodic motion is an example of a simple pendulum.
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MCQ 841 Mark
The pictorial representation of two variables inter dependent of one another is known as:
  • A
    Motion
  • ✓
    Graph
  • C
    Speed
  • D
    Time
Answer
Correct option: B.
Graph
Graph is pictorial representation of two objects.
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MCQ 851 Mark
Which of the following are examples of non $-$ uniform motion along a straight line?
  • A
    Horse pulling a cart
  • ✓
    Brakes applied on a fast moving car
  • C
    Train on a straight bridge
  • D
    All of the above
Answer
Correct option: B.
Brakes applied on a fast moving car
In non $-$ uniform motion, the speed of the object changes along a straight line.
It may increase or decrease for different intervals of time.
When brakes are applied, the car decelerates and its speed changes with time.
So applying brakes on a fast moving car is the example of non $-$ uniform motion.
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MCQ 861 Mark
How will you convert the speed given in km/ h to $m/ s?$
  • A
    By multiplying with $5/16.$
  • B
    By multiplying with $6/5.$
  • C
    By multiplying with $18/5.$
  • ✓
    By multiplying with $5/18.$
Answer
Correct option: D.
By multiplying with $5/18.$

Conversion of $km/ h$ into $m/ s.$
$1km = 1000m$ and $1h = 60min = 3600s$
$\Rightarrow\ \frac{1\text{km}}{1\text{h}}=\frac{1000\text{m}}{3600\text{s}}=\frac{5}{18}\text{m/s}$

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MCQ 871 Mark
The meter that is used to measure speed of a vehicle is:
  • ✓
    Speedometer
  • B
    Odometer
  • C
    Anemometer
  • D
    Thermometer
Answer
Correct option: A.
Speedometer
Speedometer is the device used in vehicle to measure speed of that vehicle.
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MCQ 881 Mark
If an object covers equal distance in equal intervals of time, then the object is said to have:
  • A
    Non $-$ uniform motion
  • ✓
    Uniform motion
  • C
    Oscillation
  • D
    None of these
Answer
Correct option: B.
Uniform motion
A staight line covers equal distance in equal intervals of time is uniform motion.
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MCQ 891 Mark
The correct symbol to represent the speed of an object is:
  • ✓
    $5m/s$
  • B
    $5mp$
  • C
    $5m/s^{-1}$
  • D
    $5s/m$
Answer
Correct option: A.
$5m/s$
$5m/s$ is the correct symbol to represent the speed of an object because the unit of speed is $m/s (or\ m/s^{-1}).$
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MCQ 901 Mark
Which of the following instrument measures time with the most accuracy?
  • A
    Sun dial.
  • B
    Sand clock.
  • ✓
    Quartz clock.
  • D
    Mechanical clock with gears.
Answer
Correct option: C.
Quartz clock.
Quartz clock.
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MCQ 911 Mark
Which of the following is correct statements:
  • ✓
    The basic unit of time is second.
  • B
    Every object moves with a constant speed.
  • C
    Distance between two cities is measured in metres.
  • D
    The time period of a given pendulum is not constant.
Answer
Correct option: A.
The basic unit of time is second.
The basic unit of time is second.
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MCQ 921 Mark
Observe Figure:

The time period of a simple pendulum is the time taken by it to travel from,
  • ✓
    $A$ to $B$ and back to $A.$
  • B
    $O$ to $A, A$ to $B$ and $B$ to $A$.
  • C
    $B$ to $A, A$ to $B$ and $B$ to $O.$
  • D
    $A$ to $B.$
Answer
Correct option: A.
$A$ to $B$ and back to $A.$

Time period of a simple pendulum is the total time taken to complete one full cycle, (i.e. from $A$ to $6$ and back to $A).$

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MCQ 931 Mark
The quantity which tells the distance an object travels in a certain time is called:
  • A
    Acceleration
  • ✓
    Speed
  • C
    Velocity
  • D
    None of these
Answer
Correct option: B.
Speed
The quantity which tells the distance an object travels in a certain time is called speed.
Speed$=\frac{\text{Distance}}{\text{Time}}$
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MCQ 941 Mark
The meter that is used to measure speed of a vehicle is:
  • ✓
    Speedometer.
  • B
    Odometer.
  • C
    Anemometer.
  • D
    Thermometer.
Answer
Correct option: A.
Speedometer.
Speedometer.
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MCQ 951 Mark
The times taken by a pendulum to complete one oscillation is:
  • A
    Oscillation period
  • B
    $1$ second
  • ✓
    Time period
  • D
    Frequency
Answer
Correct option: C.
Time period

Time period of a pendulum is defined the time taken by it to complete one oscillation.
Time period of simple pendulum $\text{T}=2\pi\sqrt{\frac{1}{\text{g}}}$ where l is the length of pendulum string and g is the acceleration due to gravity.

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MCQ 961 Mark
The time taken by the earth to complete one rotation about is own axis is called:
  • ✓
    Solar day
  • B
    Mean solar day
  • C
    $1$ hour
  • D
    None
Answer
Correct option: A.
Solar day

Solar day is defined as the time taken by the earth to complete one rotation about its own axis.

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MCQ 971 Mark
The meter that is used to measure the distance moved by the vehicle is known as $.........$
  • A
    Speedometer.
  • ✓
    Odometer.
  • C
    Chronometer.
  • D
    Ammeter.
Answer
Correct option: B.
Odometer.
Odometer.
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MCQ 981 Mark
Speedometer of a car measures:
  • A
    Average speed
  • B
    Average velocity
  • ✓
    Instantaneous speed
  • D
    Instantaneous velocity
Answer
Correct option: C.
Instantaneous speed
Speedometer is device that measure the speed of vehicle, at any instant of time $i.e$ measure instantaneous speed.
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MCQ 991 Mark
The to and fro motion of the particle about its mean position is called:
  • A
    Intervals
  • ✓
    Vibration
  • C
    Pendulum
  • D
    Can’t say
Answer
Correct option: B.
Vibration
To and fro motion of a particle about mean position is called vibrational motion.
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MCQ 1001 Mark
Which is in uniform motion from the following?
  • A
    The motion of Cristiano Ronaldo in the field.
  • B
    The motion of Usain Bolt in the race track.
  • ✓
    The motion of earth around the sun.
  • D
    Freely falling body.
Answer
Correct option: C.
The motion of earth around the sun.
The motion of Christiano Ronaldo in the field, motion of Usain Bolt in the race track and the motion of freely falling body are the examples of non uniform motion whereas motion of earth around the sun is the example of uniform motion.
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MCQ (1 Marks) - Page 2 - Science STD 7 Questions - Vidyadip