7-sinf Fizika IV chorak uchun mavzulashtirilgan testlar 1-Mavzu: Reaktiv harakat. Raketaning tuzilishi va ishlashi

2-Mavzu: Mexanik ish
1.Avtomobil 5kN motor kuchi ta`sirida 4km masofani bosib o`tdi. Avtomobil motori qancha ish bajargan?
+a) 20MJ b) 15MJ c) 30MJ d) 1,2 MJ
2. Yerda turgan yukka 150 N kuch ta`sir etayotgan holda u shu kuch yo`nalishida 8m masofaga sudrab olib borildi. Bunda qancha ish bajarilgan?
a)2kJ b) 4kJ +c) 1,2kJ d) 150 J
3. 1MJ ni Joulda ifodalang.
a) 1000J b) 10000J c) 100000J +d) 1000000J
4. Aravachaga ma`lum bir burchak ostida kuch ta`sir etilib, 15 m masofaga olib borildi. Agar aravachaga ta`sir etayotgan kuchning harakat yo`nalishiga proeksiyasi 42N bo`lsa, bu yerda qancha ish bajarilgan?
+a) 630J b) 600J c) 300J d) 430 J
5. Elektrovoz temiryo`l vogonlarini 2km masofaga tortib borganda 240 MJ ish bajardi. Elektroz vagonlarni qancha kuch bilan tortib brogan?
a) 1200kN +b) 120kN c) 240 kN d) 2400kN
6. Jismni 10N kuch ta`sirida 3m masofaga siljitilgandagi ishni toping(J). Kuch va ko`chish vektori orasidagi burchak 60⁰ ga teng.
a) 5 b)10 +c)15 d) 25
7. Massasi 1,5 t bo`lgan vaganetkani ishchi gorizontal yo`lda bir tekis tortib bormoqda . Agar ishqalanish koeffitsienti 0,01 bo`lsa, ishchining 10 m yo`lga bajargan ishini toping(kJ).
a) 20 +b) 15 c) 25 d)1,5
8. Massasi 6kg jismni 3m balandlikka qanday tezlanish bilan ko`targanda 198J ish bajariladi(m/s²)?
+a) 1 b) 2 c) 6 d) 3
9. Quyidagi keltirilgan qaysi kuchlarning bajargan ishi trayektoriyaning shakliga bog`liq emas?
1) og`irlik kuchi 2) elestiklik kuchi 3) ishqalanish kuchi
a) 2 +b) 1 c) 3 d) 1,3
10. Mexanik ish formulasi ko`rsatilgan javobni toping.
a) A=mgh b) A=mg +c) A=F*S d) A=F/S