🔔 conceptual questions I ⬇️

#Q1 A car undergoes a uniform circular motion. The acceleration of the car is -
1) zero
2) a non-zero constant
3) a non-zero but not a constant
4) None of the above

#Q2 Two pieces of metal when immersed in a liquid have equal upthrust on them, then -
1) Both pieces must have equal weights
2) Both pieces must have equal densities
3) Both pieces must have equal volumes
4) Both pieces are floating at the same depth

#Q3 Loudness of sound is measured in terms of following -
1) Frequency
2) Amplitude
3) Velocity
4) Wavelength

#Q4 Stainless Steel is an alloy in which following is added along with iron?
1) Zinc
2) Chromium
3) Tin
4) Copper

#Q5 Harnessing of nuclear energy often causes -
1) Air Pollution
2) Water Pollution
3) Thermal Pollution
4) Noise Pollution

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answers for conceptual questions II
#Q1 - A
#Q2 - A
#Q3 - C
#Q4 - E
#Q5 - A

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#Physics for #grade_12👇👇

#Q1

Two wires, both carrying current out of the page, have a current of magnitude 5.0 mA. The first wire is located at (0.0 cm, 3.0 cm) while the other wire is located at (4.0 cm, 0.0 cm). What is the magnetic force per unit length of the first wire on the second and the second wire on the first?

#Q2

The output of an ac generator connected to an RLC series combination has a frequency of 200 Hz and an amplitude of 0.100 V. If R = 4.00 Ω, L = 3.00 × 10−3 H, and C = 8.00 × 10−4 F, what are
(a) the capacitive reactance,
(b) the inductive reactance,
(c) the impedance,
(d) the current amplitude, and
(e) the phase difference between the current and the emf of the generator?

#Q3

Is the magnetic field inside a toroid completely uniform? Almost uniform?

#Q4

Curves on some test tracks and race courses, such as Daytona International Speedway in Florida, are very steeply banked. This banking, with the aid of tire friction and very stable car configurations, allows the curves to be taken at very high speed. To illustrate, calculate the speed at which a 100.0-m radius curve banked at 31.0° should be driven if the road were frictionless.

#Q5

The Curiosity rover was deployed on Mars on August 6, 2012. The wheels of the rover have a radius of 25 cm. Suppose astronauts arrive on Mars in the year 2050 and find the now-inoperative Curiosity on the side of a basin. While they are dismantling the rover, an astronaut accidentally loses a grip on one of the wheels, which rolls without slipping down into the bottom of the basin 25 meters below. If the wheel has a mass of 5 kg, what is its velocity at the bottom of the basin?

#Q6

How much energy is required to lift the 9000-kg Soyuz vehicle from Earth’s surface to the height of the ISS, 400 km above the surface?

#Q7

Determine the semi-major axis of the orbit of Halley’s comet, given that it arrives at perihelion every 75.3 years.
If the perihelion is 0.586 AU, what is the aphelion?

#Q8

Gasoline vapor is injected into the cylinder of an automobile engine when the piston is in its expanded position. The temperature, pressure, and volume of the resulting gas-air mixture are 20 °C, 1.00 × 105 N/m2, and 240 cm3 , respectively. The mixture is then compressed adiabatically to a volume of 40 cm3. Note that in the actual operation of an automobile engine, the compression is not quasi-static, although we are making that
assumption here.
(a) What are the pressure and temperature of the mixture after the compression?
(b) How much work is done by the mixture during the compression?

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Physics for grade 12

#part_one #8questions

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