NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 443 - 447 of 2184

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Question number: 443

» Laws of Motion » Force and Inertia

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MCQ▾

Question

The roadway bridge over a canal is the form of an arc of a circle of radius 25 m. What is the minimum speed with which a car can cross the bridge without leaving contact with the ground at the highest point (g = 9.8 m/s 2)

Choices

Choice (4) Response

a.

17.556 m/s

b.

39.899 m/s

c.

49.49 m/s

d.

45.76 m/s

Question number: 444

» Rotational Motion » Torque

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MCQ▾

Question

An automobile engine develops 100 kW when rotating at a speed of 1500 rev/min. What torque does it deliver?

Choices

Choice (4) Response

a.

531 N-m

b.

350 N-m

c.

440 N-m

d.

637 N-m

Question number: 445

» Electrostatics » Electric Potential

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MCQ▾

Question

A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then electric field at Q is proportional to

Choices

Choice (4) Response

a.

p and r -2

b.

p -1 and r -2

c.

P 2 and r -3

d.

p and r -3

Question number: 446

» Rotational Motion » Torque

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MCQ▾

Question

A torque of 20 N-m is applied on a 5 kg wheel whose moment of inertia is 2kg-m 2 for 10 sec. The angle covers by the wheel in 10 sec will be

Choices

Choice (4) Response

a.

750 rad

b.

500 rad

c.

3000 rad

d.

6000 rad

Question number: 447

» Communication System » Need for Modulation

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MCQ▾

Question

Students I, II and III perform an experiment for measuring the acceleration due to gravity (g) using a simple pendulum. They use different lengths of the pendulum and/or record time for different number of oscillations. The observations are shown in the table. Least count for length = 0.1 cm

Least count for time = 0.1 s

Table on length of pendulum and number of oscillations

Student

Length of the pendulum (cm)

No. of oscillations

(n)

Total time for (n) oscillations

(s)

Time

Period (s)

I

64.0

8

128.0

16.0

II

64.0

4

64.0

16.0

III

20.0

4

36.0

9.0

If E I, E II and E III are the percentage errors in g, i. e. , ( for students, I, II and III, respectively, then

Choices

Choice (4) Response

a.

E I is minimum

b.

E II is maximum

c.

E I = 0

d.

E I = E II