- 127 - - 127 - 21. Bikrligi 4,5 kN/m bo‘lgan prujina 2 mm ga cho‘zilganda, uning
massasi qanchaga oshadi (kg)?
A)5·10
–12
B)2·10
–20
C)3·10
–15
D)10
–19
22. Massasi 1 kg suv 81 K ga isitilganda uning massasi qanchaga
ortadi (kg)? c=4200 J/(kg·K)
A)8,1·10
–13
B)2,8·10
–13
C)3,78·10
–13
D)3,78·10
–12
23. 3,32·10
–19
energiya bilan harakatlanayolgan α zarraning tezligini
toping (m/s)? m
α
=6,64·10
–27
kg
A)10000 B)8000 C)6000 D)700
24. Bikrligi 4 kN/m bo‘lgan prujinani 30 cm ga cho‘zganda uning
massasi qanchaga ortadi (kg)?
A)2·10
–15
В)10
–14
C)6·10
–6
D)o‘zgarmaydi
25. Suv muzlaganda massasi qanday o‘zgaradi?
A)o‘zgarmaydi B)ortadi
C)kamayadi D)tashqi sharoitga bog‘liq
26. O‘zgarmas bosimda 20 kg massali azot 0 dan 200 ºС gacha
qizdirildi. Bunda azotning massasi qanchaga oshgan (g)? Azotning
o‘zgarmas bosimdagi solishtirma issiqlik sig‘imi 1,05 kJ/(kg·K).
A)0 B)4,7·10
–8
C)4,7·10
–5
D)4,7·10
–11
27. Massasi m bo‘lgan ko‘mir hammasi bo‘lib qanday energiyaga
ega? (c – yorug‘lik tezligi, Δt – temperaturalar farqi, λ – erishning
solishtirma issiqligi, q – yonishning solishtirma issiqligi)
A)cmΔt B)qm C)mc
2
D)λm
28. Massasi 1 kg suv 90 K ga isitilganda, massasi qanday
o‘zgaradi? c=4200 J/(kg·K)
A)o‘zgarmaydi B)42·10
–13
kg ga kamayadi
C)42·10
–13
kg ga ortadi D)84·10
–13
kg ga ortadi