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Passage VI Q 107-112 MCAT 1PowerPoint Presentation

Passage VI Q 107-112 MCAT 1

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Passage VI Q 107-112 MCAT 1

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Q 107Which of the following describes the direction of the motion of alpha, beta, and gamma rays in the presence of an external magnetic field?

- .They all travel straight.
- .They all are bent in the same direction
- .Gamma rays travel straight; alpha and beta rays are bent in the same direction.
- .Gamma rays travel straight; alpha and beta rays are bent in opposite directions.

Q 108The fissioning of the 23592U nucleus involves the release of energy. Which of the following describes the main energy transfer that takes place?

- .Kinetic to potential.
- .Mass to kinetic
- .Potential to mass
- .Kinetic to electrical

Q 109A radioactive series begins with 23892U and has an intermediate product of 23492 U. Which of the following describes a possible sequence of particle emissions that occurs between these two atoms?

- .Beta, beta, beta, beta.
- .Alpha, beta, beta, beta.
- .Alpha, alpha, beta, beta.
- .Alpha, beta, beta.

Q 110A sample of radiosium (2411Na) has a half-life of 15 hr. If the sample’s activity is 100 millicuries after 24 hr, approximately what must its original activity have been?

- .200 millicuries.
- .300 millicuries.
- .600 millicuries.
- .1000 millicuries.

Q 111In a radioactive series, a nucleus decays through several steps. The thorium series starts with a 23290Th atom, then emits 1 alpha, 2 beta, 4 alpha, 1 beta, 1 alpha, and 1 beta, in succession. The final product of the series is:

- .20882Pb.
- .20888Ra.
- .22082Pb.
- .22088Ra.

Q 112When a nucleus emits a 2.5 MeV gamma ray, by how much does the nuclear mass decrease?

- .2.8 X 10-28 kg.
- .1.2 X 10-28 kg.
- .4.4 X 10-30 kg.
- .8.6 X 10-31 kg.

Q 124The densities of the balls, D1, D2, and D3, are related by which of the following?

- .D1 < D2 < D3.
- .D1 < D2 = D3.
- .D1 = D2 < D3.
- .D1 = D2 > D3.

Q 125Ball 2 is in the water 20 cm above Ball 3. What is the approximate difference in pressure between the two balls?

- .2 X 102 N/m2.
- .5 X 102 N/m2.
- .2 X 103 N/m2.
- .5 X 103 N/m2.

Q 126Assume that the density of Ball 1 is 8.0 x 102 kg/m3. Ignoring atmospheric pressure, what fraction of Ball 1 is above the surface of the water?

- .4/5
- .3/4
- .1/4
- .1/5

Q 127Assume that the side of the water tank is punctured 5.0 m below the top of the water, and the atmospheric pressure is 1.0 x 105 N/m2. What is the approximate speed of the water flowing from the hole?

- .10 m/s
- .12 m/s
- .14 m/s
- .17 m/s

Q 102If all the current in the lamp is due to electron motion, how many electrons are emitted from the cathode each second when the current is 0.2 A?

- .2.50 x 1018
- .1.25 x 1018
- .1.60 x 1017
- .1.25 x 1017

Q 108A nuclear reactor operates most efficiently if its shape contains the minimum surface area for neutrons to escape for any specific volume. The most efficient reactor would be in the shape of a:

- .cube.
- .sphere
- .cylinder
- .slab

Q 117A 12-V battery causes a current to flow through a circuit consisting of a 24- and an 8- resistor in parallel. What current flows through the 8- resistor?

- .0.5 A
- .1.0 A
- .1.5 A
- .2.0 A

Q 122What physical quantity is represented by the area of quadrilateral OABC in Figure 2?

- .Average speed of the box
- .Average acceleration of the box
- .Distance traveled by the box
- .Work done on the box

Q 123Which of the following expressions is equal to a, the acceleration vector of the box as it moves from Point B to Point C? (Note: The coefficient of friction between the box and the surface between Point B and Point C is equal to kh.)

- . (-g + kh)iC. khg i
- . (-g/kh)iD. - khg i