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Shilpa

HomeAuthor: ShilpaPage 19

⌈NH (CH 2  ) NHCO (CH 2 ) 4  CO ⌉ n is a 

⌈NH (CH 2  ) NHCO (CH 2 ) 4  CO ⌉ n is a a. Thermosetting polymer b. Homopolymer c. Copolyer d.  Addition polymer Ans. c (14)

The condensation polymer among the following is

a. Protein b. PVC c. Polythene d. Rubber Ans. a (11)

Which of the following is not a synthetic polymer

a. Polyethylene b. PVC c. Nylon d. Cellophane Ans. d (9)

If the density of a small planet is the same as that of earth, while the radius of the planet is 0.2 times that of the earth, the gravitational acceleration on the surface of that planet is

(a)      0.2 g                                           (b)  0.4 g (c)   2 g                       ...

A body weight 500 N on the surface of the earth. How much would it weigh half way below the surface of the earth

(a)      125 N                              (b)  250 N...

What should be the angular speed of earth, so that body lying on equator may appear weightlessness ( g = 10 m/s2, R=6400 km )

(a)      1/800  rad/s                               (b) ...

A person will get more quantity of matter in kg –wt. at

(a)      Poles                               (b)  At latitude of...

The density of a newly discovered planet is twice that of earth. The acceleration due to gravity at the surface of the planet is equal to that at the surface of the earth. If the radius of the earth is R, the radius of the planet would be

(a)    2R                                   ...

If both the mass and the radius of the earth decrease by 1%, the value of the acceleration due to gravity will

(a)      Decrease by 1%                       (b)  Increase by 1% (c)   Increase by 2%                 (d)  Remain unchanged Answer:  b (9)

73. Weight of a body of mass m decreases by 1% when it is raised to height h above the earth’s surface. If the body is taken to a depth h in a mine, change in its weight is

(a)  2% decrease                    (b)  0.5% decrease (c)   1% increase                      (d)  0.5% increase Answer: b (9)

The depth at which the effective value of acceleration due to gravity is  g/4 is

(a)  R                                         (b)  3R/4 (c)      R/2                       ...

71. The acceleration of a body due to the attraction of the earth (radius R) at a distance 2 R from the surface of the earth is (g = acceleration due to gravity at the surface of the earth)

(a)    g/9                                   ...

Acceleration due to gravity on moon is 1/6 of the acceleration due to gravity on earth.  If the ratio of densities of earth  ( pe ) and moon ( pm )  is ( pe/pm )  = 5/3  then radius of moon Rm in terms of Re will be

(a)      5/18 Re                            (b)  1/6...

A research satellite of mass 200 kg circles the earth in an orbit of average radius 3R/2 where R is the radius of the earth. Assuming the gravitational pull on a mass of 1 kg on the earth’s surface to be 10 N, the pull on the satellite will be

(a)  880 N                                 (b)  889 N (c)   890 N                                 (d)  892 N Answer: a (7)

If the value of ‘g’ acceleration due to gravity, at earth surface is 10 m/s2 , its value in  m/s2  at the centre of the earth, which is assumed to be a sphere of radius ‘R’ metre and uniform mass density is

(a)  5                                         (b)  10/R (c)   10/2R                                (d)  Zero Answer: d (16)

The acceleration due to gravity at pole and equator can be related as

(a)    gp < ge                           (b)  gp =...

If the density of the earth is doubled keeping its radius constant then acceleration due to gravity will be (g=9.8 m/s2 )

(a)   19.6 m/s2                         (b)  9.8 m/s2 (c)     ...

A body weight W newton at the surface of the earth. Its weight at a height equal to half the radius of the earth will be

(a)    W/2                                   (b) ...

The acceleration due to gravity is g at a point distant r from the centre of earth of radius R. If  r < R , then

(a)       g ∝ r                            (b) ...

If density of earth increased 4 times and its radius become half of what it is, our weight will

(a)  Be four times its present value (b)  Be doubled (c)   Remain same (d)  Be halved Answer:  b (5)

At what distance from the centre of the earth, the value of acceleration due to gravity g will be half that on the surface (R = radius of earth)

(a)  2 R                                      (b)  R (c)   1.414 R                              (d)  0.414 R Answer:  d (6)

5. Nylon is not a

a. Condensation polymer b. Polyamide c. Copolymer d. Homopolymer Ans. d (7)

4. Polyethylene is

a. Random copolymer b. Homopolymer c. Alternate copolymer d. Crosslinked copolymer Ans. b (14)

3. Which of the following is an example of condensation polymer

a. Nylon b. Bakelite c. Urea-formaldehyde resin d. all of these Ans. d (18)

2. A thermoplastic among the following is

a. Bakelite b. Polystyrene c. Terylene d. Urea-formaldehyde resin e. Nylon Ans. b (12)

1. Correct statement for thermoplastic polymer is

a. It does not become soft on heating under pressure b. it can not be remoulded c. it is either...

The acceleration due to gravity near the surface of a planet of radius R and density d is proportional to

(a)    d/R2                                 (b)  dR2...

What will be the acceleration due to gravity at height h if h >> R. Where R is radius of earth and g is acceleration due to gravity on the surface of earth

(a)   g/(1 + h/R  )2                     (b)  g ( 1 – 2h/R...

Weight of a body is maximum at

(a)  Moon                                  (b)  Poles of earth (c)   Equator of earth               (d)  Centre of earth Answer: b (6)

A man can jump to a height of 1.5 m on a planet A. What is the height he may be able to jump on another planet whose density and radius are, respectively, one-quarter and one-third that of planet A

(a)  1.5 m                                  (b)  15 m (c)   18 m                                   (d)  28 m Answer: c (5)

The angular speed of earth, so that the object on equator may appear weightless (g = 10 m/s2 , is , radius of earth 6400 km)

(a)     1.25×10-3 rad/sec          (b)  1.56 ×10-3 rad/sec (c) 1.25×10-1 rad/sec            (d) ...

Assume that the acceleration due to gravity on the surface of the moon is 0.2 times the acceleration due to gravity on the surface of the earth. If  Re is the maximum range of a projectile on the earth’s surface, what is the maximum range on the surface of the moon for the same velocity of projection

(a)   0.2 Re                               (b) 2...

If the mass of earth is 80 times of that of a planet and diameter is double that of planet and ‘g’ on earth is 9.8 m/s2 , then the value of ‘g’ on that planet is

(a)    4.9 m/s2                    (b)  0.98 m/s2 (c)   0.49  m/s2   ...

R and r are the radii of the earth and moon respectively. pe  and  pm are the densities of earth and moon respectively. The ratio of the accelerations due to gravity on the surfaces of earth and moon is

(a)      R/r  pe/ pm                 (b)  r/R  pe/ pm (c)      r/R  pe/ pm ...

Assuming earth to be a sphere of a uniform density, what is the value of gravitational acceleration in a mine 100 km below the earth’s surface (Given R = 6400 km)

(a)      9.66 m/s2                      (b)  7.64 m/s2 (c)   5.06m/s2...

The angular velocity of the earth with which it has to rotate so that acceleration due to gravity on 60o latitude becomes zero is (Radius of earth = 6400 km. At the poles g=10 ms-2)

(a)  2.5 × 10-3 rad /s               (b)  5.0 × 10-1 rad /s (c)  10  ×...

An object weights 72 N on earth. Its weight at a height of R/2 from earth is

(a)  32 N                                   (b)  56 N (c)    72 N                   ...

The height of the point vertically above the earth’s surface, at which acceleration due to gravity becomes 1% of its value at the surface is (Radius of the earth = R)

(a)  8 R                                      (b)  9 R (c)   10 R                                    (d)  20 R Answer: b (9)

If the Earth losses its gravity, then for a body

(a)  Weight becomes zero, but not the mass (b)  Mass becomes zero, but not the weight (c)   Both mass and...

At what height from the ground will the value of ‘g’ be the same as that in 10 km deep mine below the surface of earth

(a)  20 km                                 (b)  10 km (c)   15 km                                 (d)  5 km Answer: a (10)

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