Fizika 7-sinf III-chorak I- variant. Javoblar
Savollar
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Javoblar
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D
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B
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A
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B
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E
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18. Unga qo`yilgan kuchga
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20.11,2 km/s
21.harakatga qarama-qarshi
22. turtki
23. kuch impulsi
24. 4 marta ortadi.
25. jism massasining
Fizika 7-sinf III-chorak II- variant. Javoblar
Savollar
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javoblar
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B
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C
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E
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C
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B
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D
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E
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18. Ko`paytmasiga
19. Jism impulsining o`zgarishiga
20. Saqlanadi (o`zgarmaydi)
21. Harakatga qarama - qarshi
22. kg m/
23. Dinamometr
24. nolga
25. Leonov
Fizika 7sinf IV-chorak. I-variant.
1. Raketa qanday kuch tasirida harakatlanadi?
a) Arximed kuchi b) Reaktiv kuch c) Og`irlik kuchi d) Bosim kuchi e) Ishqalanish kuchi
2. Raketa tezligi gaz tezligi 2 marta kamayganda qanday o`zgaradi?
a) 2 marta ortadi b) 2 marta kamayadi c) o`zgarmaydi d) 4 marta ortadi e) 4 marta kamayadi
3. Jism 10 N kuch ta’sirida 60 sm masofaga ko`chsa, bu kuch qancha ish bajargan?
a) 600 J b) 60 J c) 6 J d) 50 J e) 70 J
4. Jism 4,5 N kuch ta’sirida gorizontal yo`nalishda 2 metr masofaga ko`chdi. Og`irlik kuchining bajargan ishi qanchaga teng?
a) 9 N b) 2,25 N c) 6,5 N d) 0 e) T.J.Y
5. Jismning kinetik enYergiyasi qanday birlikda o`lchanadi?
a) Joul b) Gramm c) Nyuton d) Paskal e) m/s2
6. Jism tezligi 4 marta kamayganda uning kinetik enYergiyasi qanday o`zgaradi?
a) 2 marta ortadi b) 4 marta ortadi c) 8 marta ortadi d) 16 marta kamayadi
e) o`zgarmaydi
7. Tezligi 72 km/soat bo`lgan 2 t massali avtomobil to`xtashi uchun qancha ish bajarilishi kYerak?
a) 4 x105 J b) 400 x105 J c) 0,4 J d) 40 kJ e) 4000 kJ
8. Potensial enYergiya 4 marta ortgan. Balandlik qanday o`zgargan?
a) 2 marta ortgan b) 4 marta ortgan c) 4 marta kamaygan
d) 8 marta ortgan e) o`zgarmagan
9. Quvvat qanday birlikda o`lchanadi?
a) Joul b) kg c) Vatt d) Metr e) Paskal
10. Quvvati 16 W bo`lgan mashina 2 minutda qancha ish bajaradi?
a) 32 J b) 1,92 kJ c) 14 J d) 8 J e) T.J.Y
11. Quvvat formulasi qaysi javobda to`g`ri ko`rsatilgan?
t A
a) N=A∙t b) N=m∙g∙S c) N=—— d) N= —— e) N=A+t
A t
12. Foydali ishning sarflangan ishga nisbati ..... deb ataladi.
a) quvvat b) ish c) enYergiya d) ko`chish e) foydali ish koeffitsienti
13. Asosiy birlikka keltiring. (15 gW)
a) 1,5 W b) 150 W c) 1500 W d) 15000 W e) 0,15 W
14. 3 metr balandlikdan 6 kg massali jism tushgan qancha ish bajarishi mumkin? (g=10m/s2)
a) 180 J b) 18 J c) 0,18 J d) 18 kJ e) 0
15. Yer sirtida yotgan jismning potensial enYergiyasi qanchaga teng?
a) 500 J b) 400 J c) 600 J d) 10 kJ e) T.J.Y
16. Ek1 + Ep1 = Ek2 +Ep2 formula qaysi qonunni ifodalaydi?
a) Impulsning saqlanish qonunini b) EnYergiyaning saqlanish qonuni
c) EnYergiyani d) Mexinik ishni e) Tezlik va enYergiyani
17. Jism 18 N kuch bilan ushlab turilganga qancha ish bajariladi.
a) 180 J b) 18 J c) 0,18 J d) 18 kJ e) 0
18. Bajarilgan ish kuchning ish kuch yo`nalishida jism bosib o`tgan yo`lning ______________teng.
19. 1 N kuch ta’sirida 1 m ga jism siljiganda ___________ ish bajariladi.
20. Jismning kinetik enYergiyasi ______________ bog`liq.
21. Jismlarning potensial enYergiyasi ______________ bog`liq.
22. Kuchning tezlikka bo`lgan ko`paytmasi ____________ga teng.
23. Vaqt birligi ichida bajarilgan ish ______________ deyiladi.
24. Quvvat ___________ birliklarida o`lchanishi mumkin.
25. EnYergiya ____________ xossasiga ega.
Fizika 7-sinf IV-chorak II-variant.
1. Raketaning harakati qaysi qonunga asoslanadi?
a) EnYergiyaning saqlanish qonuniga b) Impulsning saqlanish qonuniga
c) Nyutonning II-qonuniga d) Arximed qonuniga e) Paskal qonuniga
2. Gazning otilib chiqish tezligi 4 marta ortganda raketa tezligi qanday o`zgaradi?
a) 2 marta ortadi b) 2 marta kamayadi c) o`zgarmaydi d) 4 marta kamayadi
e) 4 marta ortadi
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