SAT Physics Practice Questions 1 & answer key

SAT Practice questions

1)if  the focal distance of a lens is 2m. then the lens is :

A.  -1/2 diopter converging lens
B.   1/2 diopter converging lens
C.  -1/2 diopter diverging lens
D.   1/2 diopter diverging lens


2)what is the energy stored in a 1 μF capacitor charged at 2kV

A. 5 j
B. 3.2 j
C. 4 j
D. 6 j


3) 1 Kcal of heat furnished to a system .and this system deos 4 kj of work.what is the value of $\Delta{U}$?


A.184 j
B.1kj
C.1.184kj
D. 4kj


4) the electric field of very long straight wire is?


A.$ E=\lambda /4\pi \epsilon_{0}d$
B.$ E=\lambda/2\pi\epsilon_{0}d$
C.$E=\lambda/\pi\epsilon_{0}d$
D.$E=2\lambda/\pi\epsilon_{0}d$




Answer key
1.B
2.C
3.A
4.B