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

10-Mavzu: Quvvat. Masalalar yechish
1. Quyidagi berilgan javoblar orasidan quvvat birligini toping.
a) N +b) W c) kg d) J
2. Quyidagi berilgan javoblar orasidan quvvat formulasini toping.
a) A=N*t b)N=mgh c) E_k=mv²/2 +d) N=F*𝑣
3.1 ot kuchi necha W gat eng?
+a) 736 b) 734 c) 732 d)726
4. Katta kran 10 t g`ishtni, kichik kran esa 2t g`ishtni 30m balandlikka 1 minutda olib chiqdi. Har bir kran quvvatining foydali qismini toping. (kW).
a) 40; 10 b) 50; 20 +c) 50; 10 d) 20; 10
5. Agar bola 1 soatda 360 kJ ish bajargan bo`lsa, bola quvvatining foydali qismini toping(W).
+a) 100 b) 200 c) 360 d ) 150
6. Samolyot 900km/soat tezlik bilan uchmoqda. Motorining foydali quvvati 1,8 MW bo`lsa, uning tortish kuchi qancha(kN)?
a) 7,8 +b) 7,2 c) 3,6 d ) 9,8
7. Ot massasi 1t bo`lgan aravani 1km masofaga 10 minutda ilib bordi. Agar aravaning harakatiga qarshilik koeffitsiyenti 0,06 ga teng bo`lsa, ot quvvatining foydali qismini toping(kW).
a) 2 b)3 c)4 +d)1
8. Quvvat , kuch va tezlik orasidagi munosabat qanday ifodalanadi?
+a) N=F* 𝑣 b)N=F/ 𝑣 c) N=F²/ 𝑣 d) F=N* 𝑣
9. Agar bola 0,5 soatda 180 kJ ish bajargan bo`lsa, bola quvvatining foydali qismini toping(W).
+a) 100 b) 600 c) 360 d) 150
10. Samolyot 720km/soat tezlik bilan uchmoqda. Motorining foydali quvvati 2 MW bo`lsa, uning tortish kuchi qancha(kN)?
a) 8 +b) 10 c) 6 d) 9