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| 3951. |
Wkst for science motion and time Class-VII Dav if possible otherwise NCRT is fine |
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Answer» ong>Answer: okkk i will give a whole solutions Explanation: Q.1.Classify the following as motion along a straight line, circular or oscillatory motion : (i) Motion of your hands while running. (ii) Motion of a horse pulling a cart on a straight road. (iii) Motion of a child in a merry-go-round. • (iv) Motion of a child on a see-saw. (v) Motion of the hammer of an electric bell. (VI) Motion of a train on a straight bridge. Ans.(i) Oscillatory motion (ii) Linear motion (iii) Circular motion (iv) Oscillatory motion (v) Oscillatory motion (vi) Linear motion Q.2.Which of the following are not correct? (i) The basic unit of time is second. (ii) Every object moves with a constant speed. (iii) Distances between two cities are measured in kilometers. (iv) The time period of a given pendulum is not constant. (v) The speed of a train is expressed in m/h Ans. (ii), (iv), (v)
Q.3.A simple pendulum takes 32s to complete 20 oscillations, what is the time period of the pendulum? Ans. Time taken to complete 20 oscillations = 32 s Time taken to complete 1 oscillation = 32/20 s = 1.6 s Time period of a pendulum is time taken by it to complete 1 oscillation. Time period of pendulum is 1.6 seconds. Q.4.The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train. Ans.Distance = 240 km Time taken = 4 hours Speed =Distance covered/time taken = 240km/4 hammer =60 km/h Speed of train =60 km/h
Q.5.The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336.0 km? Calculate the speed of the car in km/min during this time. Express the speed in km/h also. Ans.Distance = 57336.0 km – 57321 km =15 km Speed in km/min =15km/20 min = 3/4 km/min Speed in km/hr =15 km/1/3 hr =(15 X 3) km/hr =45 km/hr. Q.6.Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/min, calculate the distance between her house and the school. Ans.Time taken =15 min Speed = 2 m/min . Distance = speed x time = 2 x 15 = 30 m Distance between Salma’s school and her house is 30 m.
Q.7.Show the shape of the distance-time graph for the motion in the following cases : (i) A car moving with a constant speed. (ii) A car parked on a side road Ans. ncert-solutions-class-7-science-chapter-13-motion-and-time-01 Q.8. Which of the following relations is correct? (i) Speed = Distance Time (ii) Speed = Distance/Time (iii)Speed – Time/Distance (iv)Speed = 1/Distance Time Ans. (ii) Speed = Distance/Time is correct Q.9.The basic unit of speed is: (i) km/min (ii) m/min (iii) km/h (iv) m/s Ans. (iv) m/s Q.10.A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is: (i) 100 km (ii) 25 km (iii) 15 km (iv) 10 km Ans.(ii) 25 km Q.11.Suppose the two PHOTOGRAPHS, shown in fig. 13.1 and fig. 13.2 of NCERT had been taken at an interval of 10 seconds. If a distance of 100 metres is shown by 1 cm in these photographs, calculate the speed of the blue car. Ans.0.1 cm/s or 10 m/s
Q.12.Fig 13.10 shows the distance-time graph for the motion of two vehicles A and B. Which one of them is moving faster? ncert-solutions-class-7-science-chapter-13-motion-and-time-02 Ans. ‘A’ is moving faster. Q.13.Which of the following distance-time graphs shows a truck moving with speed which is not constant? ncert-solutions-class-7-science-chapter-13-motion-and-time-03 Ans. (iii) this is a whole chapter answer |
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| 3952. |
Number of subshells present in M shell is____. |
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Answer» align="absmiddle" alt="{\TT{\pink{\underline{\underline{\huge{ANSWER:}}}}}}" class="latex-formula" id="TexFormula1" src="https://tex.z-dn.net/?f=%7B%5Ctt%7B%5Cpink%7B%5Cunderline%7B%5Cunderline%7B%5Chuge%7BAnswer%3A%7D%7D%7D%7D%7D%7D" title="{\tt{\pink{\underline{\underline{\huge{Answer:}}}}}}"> number of subshells PRESENT in M shell is three. __________________________ |
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| 3953. |
من خلال - ..اور کیا ہے۔= = جوSchoolsوiof studenteعمدة مندح |
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Answer» ONG>ANSWER: SORRY I don't UNDERSTAND |
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| 3954. |
11 aWhen a body is dropped freely, thena) u = 0, s = 0 b) u = 0, s = h c) v = 0, s = h d) v=0.s=0If the air resistance is taken into account, the acceleration of a denser body is |
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Answer» ONG>ANSWER: b OPTION is the correct option |
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| 3955. |
Define the time period and frequency. How are they related to? |
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Answer» ong>Answer: TIME Period refers to the time it takes something to HAPPEN. FREQUENCY is a rate quantity. Time Period is a time quantity. Frequency is the cycles/second. Explanation: PLSSS mark it as brainliest it is my 900th answer!!!! |
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| 3957. |
An iron ball at 40°c is dropped in a mug containing water at 40°c. the heat will |
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Answer» ong>ANSWER: be 0 Explanation: be 0 40 - 40 --0 ..,........... |
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| 3958. |
6. The leaf-like pink gland in human body is (a) Liver(b) Villi(c) Lacteal(d) Pancreas |
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Answer» ONG>ANSWER: pancreas Explanation: |
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| 3959. |
5. Gastric glands are found in (a) Stomach(b) Buccal cavity(c) Liver(d) Large intestineLL |
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Answer» ong>ANSWER: A) Stomach because There are THREE types of gastric glands, distinguished from one another by location and TYPE of secretion. Hope it HELPS [and pls brainly :< ] Explanation: |
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| 3960. |
Observe the situations of electrostatic forces in gour daily life and prepare a report |
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Answer» One such EXAMPLE can be the sticking of paper pieces to a comb that has been rubbed on one's head. The electrostatic ENERGY generated in the comb attracts the paper pieces towards itself. Lightning can also be said to be one of the EXAMPLES of electrostatic charges but UNLIKE others this happens in a very large SCALE. |
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| 3961. |
4. Hydrochloric acid in stomach (a) Helps in the digestion of fats(b) Kills bacteria ingested along with food(c) Converts starch into sugars(d) Helps in the digestion of protein |
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Answer» ong>ANSWER: A is your answer |
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| 3962. |
When velocity time graph is parallel to time axis the body |
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Answer» ong>ANSWER: In VELOCITY-Time graph if the line is PARALLEL to the time axis then this means that velocity does not change at any time and thus velocity is Constant. Since the velocity doesn't change means there is no acceleration or RETARDATION and thus the acceleration on this body is Zero! Explanation: |
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| 3963. |
a person in a lift which descends down with an acceleration of 1.8m/s^2 drops a stone from a height of 2m.the time |
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Answer» ONG>ANSWER: icecreamyouscreamwescream Explanation: icecreamyouscreamwescream |
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| 3964. |
The velocity time graph of a uniformly accelerated body is a |
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Answer» ut in the velocity time graph as velocity CHANGES at a constant RATE with respect to time in UNIFORMLY accelerating motion, the graph WOULD be a straight line with its SLOPE indicating the amount of acceleration. HOPE IT HELPS U... |
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| 3966. |
I am asking completely confusing questions wait for my update lets start today's topic is physics |
| Answer» ONG>Answer: | |
| 3967. |
Give few examples for sliding friction |
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Answer» ong>Answer: Specific EXAMPLES of sliding friction include:
Explanation: hope it helped you please MARK brainlist |
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| 3968. |
Find the value of M so that the vector 3 - 2 J + K may be perpendicular to the vector 2i + 60 + MK |
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Answer» ONG>ANSWER: njdfbnzdfj |
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| 3969. |
Explain "Right-hand thumb rule for loops and coils". |
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Answer» ONG>Answer: Explanation: When ELECTRICITY (conventional CURRENT) flows in a long straight wire it creates a circular or CYLINDRICAL magnetic field AROUND the wire according to the right-hand rule. ... If the fingers of the right hand are curled in the direction of the circular component of the current, the right thumb points to the north pole. |
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| 3970. |
To when the forces are acting on a body are equal in magnitude but opposite in direction, the body (state)(A)moves front (B) moves back(C)Remainsstationary (D)moves up |
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Answer» ong>ANSWER: (C) Remains stationary Explanation: the forces cancelled each other effects DUE its opposite direction and same MAGNITUDE. |
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| 3971. |
Acceleration due to gravity of the earth is less at equator than of poles , why? |
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Answer» ong>ANSWER: Because the force due to gravitational attraction between TWO bodies (the Earth and the object being WEIGHED) varies INVERSELY with the square of the distance between them, an object at the Equator experiences a weaker gravitational pull than an object at the poles. Hope it helped |
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| 3974. |
a railway timetable can provide information which can be turned into a distance/time graph the timetable below shows some of the stopping points of the Himachal express, a train that runs northwards from Delhi to Himachal in India |
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Answer» ONG>Answer: 8435248536240420 Explanation: 52543434528745412524523345678907654564758697654w5678 |
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| 3975. |
If a force acts on a body in (moving with constant speed)in the direction of it's motion the speed of the body moving with constant speed a) zero b) increases c) decreases d) cannot be measured |
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Answer» ONG>Answer: B) increases Explanation: as force is in the same DIRECTION of motion it ll favour the motion HENCE speed increases |
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| 3976. |
The distance of a planet from the sun is 40 times that of the earth. what is the ratio of their time periods of revolution around the sun? |
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Answer» is the RATIO of their time period of REVOLUTION AROUND the SUN. 2. See ANSWERS. |
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| 3977. |
Hi friends please answer me I will follow you and give thanks if you answer me correctly with solution and mark as brainliest answer please................ |
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Answer» ong>Explanation: |
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| 3978. |
an example for permanent change in the shapeof an object is a) crusing the grain b) squeezing a sponge c) stretching a rubber band d)breaking glass |
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Answer» ONG>ANSWER: it's so EASY it's D) braking of glass |
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| 3979. |
What will happen when the friction dissapear from the earth |
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Answer» ong>Answer:Now, if friction disappears from Earth, it will be become a dangerous event because of the following REASON: Friction provides retarding FORCE to moving object as a RESULT of which they come to rest. In absence of friction, the moving objects will tend to move for eternal time periods and will not come to rest. We will not even be able to do our normal daily activities e.g, Picking up objects, holding a glass , ETC. We would not be able to walk, run,etc and will inevitably slip down. We will not be able to write on paper/blackboards using chalks, pencils,etc. Explanation:please mark me as brilliant please please If U mark me as brilliant then thank you so much |
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| 3980. |
Name the full form of PETA |
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Answer» ONG>ANSWER: People for the ETHICAL Treatment of Animals Explanation: hope it helps you... |
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| 3981. |
Define pressure and electronic force |
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Answer» sure (SYMBOL: p or P) is the force applied perpendicular to the surface of an OBJECT per unit area over which that force is distributed. ... Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere (ATM) is EQUAL to this pressure, and the torr is DEFINED as 1⁄760 of this. |
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| 3982. |
24. The table below shows motion of two bodies A and B АBV(m/s) t(s)V(m/s) t(s)-52-204-104-158-206-1012-258-516a. Which of the two is accelerating uniformly? Why?Sketch the shape of its distance time graph (not to scale) |
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Answer» ONG>ANSWER: JUTA ulsufsukfzjuxufduluftdutexxufffjhfsfdtrcycdutsidjxucxig |
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| 3983. |
Hi friends please answer me if answer with solution and correct me I will mark as brainliest and follow you please guys I'm begging you .......... |
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Answer» ong>Answer: find it on doubt nout I'm SURE you will get the correct answer give me a thanks ❤️ MARK as BRAINLIEST follow me |
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| 3984. |
Hi friends please answer me with solution I will mark as brainliest answer who will answer first and correct.......... |
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Answer» ONG>ANSWER: -1 2/5 Explanation: |
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| 3985. |
How are monsoon winds generated? |
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Answer» ong>Answer: The primary cause of monsoons is the difference between annual temperature trends over land and sea. ... This low pressure regions sees continuous rise of moist wind from the sea surface to the upper LAYERS of the atmosphere, where the cooling means the AIR can no longer hold so MUCH moisture resulting in PRECIPITATION. |
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| 3986. |
State kepler's first law of planetary motion |
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Answer» ong>Answer: Kepler's First LAW of Planetary Motion States That :-All planets MOVE AROUND the Sun in ELLIPTICAL orbits, having the Sun as one of the foci. |
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| 3987. |
One car use total energy 2500J and it will do 750J output.Then what is the efficiency of car? i 50%ii 30% iii 25%iv 80%Give me correct answer by explanation |
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Answer» ong>Answer: your answer is 30%. Explanation: EFFICIENCY% =WORK output/work INPUT *100 =750/2500*100 =750/25=30% |
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| 3988. |
The matter which has no fixed shape and no fixed volume is ____________ |
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Answer» align="absmiddle" alt="{\TT{\purple{\underline{\underline{\HUGE{Answer:}}}}}}" class="latex-formula" id="TexFormula1" src="HTTPS://tex.z-dn.net/?f=%7B%5Ctt%7B%5Cpurple%7B%5Cunderline%7B%5Cunderline%7B%5Chuge%7BAnswer%3A%7D%7D%7D%7D%7D%7D" title="{\tt{\purple{\underline{\underline{\huge{Answer:}}}}}}"> the matter which has no fixed SHAPE and no fixed volume is gas. ________________________ |
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| 3989. |
What do you mean by Coriolis effect ? Give an example where this effect can be observed. |
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Answer» ong>ANSWER: The Coriolis effect isdefined as how a MOVING object seems to veer toward the right in the Northern hemisphere and left in the Southern hemisphere. An EXAMPLE of theCoriolis effect is HURRICANE WINDS turning left in the Northern hemisphere |
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| 3990. |
How can can you say that a body is in motion is it a common property |
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Answer» ong>ANSWER: |
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| 3991. |
This question based on (Presser), Presser of the ground is more when aman is walking , than he is standing(give reason ) |
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Answer» ong>Answer: PRESSURE is nothing but : force/AREA the area REMAINS the same (his area of foot) there is change in force when he WALKS force is DUE to gravity since...... |
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| 3992. |
Write the following equations in statement forms: (1) p + 4 = 15 (i) m - 7 = 3(iii) 2m = 7(IV)3mm= 35р+2=82(v)= 6(vi) 3p + 4 = 25(vii) 4p-2 = 18(viii)5 |
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Answer» 1)m-7=3 m=4 so, 4-7=3 Explanation: |
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| 3993. |
This question based on (Presser) Tip of a needle is sharp(give reason) plz plz plz plz plz plz plz plz plz plz plz plz plz tell fast bhai |
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Answer» ong>ANSWER: Pressure is nothing but force/AREA if we decrease area pressure will increase So., the tip of needle is SHARP Best of Luck for online EXAM |
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| 3994. |
The matter which has fixed volume is _____ |
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Answer» ong>Answer: SOLID is the correct answer Explanation: |
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| 3995. |
Someone please send me picture of real rainbow |
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Answer» ope This WOULD Help You Pls Mark as BrainliestHope You Had GOOD Day...Thanks for asking and KEEP asking more... |
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| 3996. |
How pressure is related with 0/1 force when area of the object remains constant |
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Answer» ONG>ANSWER: भाई रुको सॉल्व करके सेंड कर रहा हूं |
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| 3997. |
The force of attracaction present between the particles of f matter is called ______ |
| Answer» ONG>ANSWER: | |
| 3998. |
What will happen to friction if the surface area of an object is reduced but mass remains the same?? |
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Answer» ong>Answer: PLEASE mark as brainlist answer!!Explanation- The force due to friction is generally independent of the contact area between the two surfaces. This means that even if you have two heavy objects of the same mass, where ONE is half as long and twice as HIGH as the other one, they STILL experience the same frictional force when you drag them over the ground.I hope this will help you!!❣❣❣ |
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| 3999. |
A simple pendulum makes 85 oscillations in 15 seconds. What is the time period and frequency of its oscillation |
Answer» ONG>ANSWER:Here is UR answerExplanation: KINDLY MARK me as brainliest and follow me |
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| 4000. |
How will you prepare deionised water from a sample of hard water |
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Answer» ONG>ANSWER: with your BRAIN ooooooooooooooooooooooook |
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